111145612123456789101234567812134123456789101234567891234121C0119632024/Q41234Not Prepared567812341234true5true67891011121314121234567123434123456517528539541055115612571358145915601661176218631964206521662267168269370171172373174275176277378479180false28138248358418518628738841512234O567238111112112211121314false25false364758697108119121013111412151316117118219320121222323424125226327428529630831932103313423533643753813924044154264374484594610471248134950 C011963 HHC793DDF0091C4F07817DF55F93548023 2024-12-31 C011963 bda039ee8d2c3790e6912f49212662cf 2024-01-012024-12-31 C011963 HH4FA44F6986EABEAE551C3EFC27434718 2024-01-012024-12-31 C011963 HHA97FEDBCE30ECFBC5F77F23789B0EE00 2024-01-012024-12-31 C011963 HH8D4CF91396CE241B4E15CB138A5C01A7 2024-12-31 C011963 Aberdeen #1 2024-12-31 C011963 HH44091F73F74CC40B28EBB17B676FEF56 2024-01-012024-12-31 C011963 HHE72D6E9F79BD98496FE5E038FEEA0D3E 2024-01-012024-12-31 C011963 ferc:GasUtilityMember HH5F4BDCBE299BEB86C60F038AD4B1CA66 2023-12-31 C011963 HHC5850B515E23FE6821E799D89F1D733A 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHF137667547FDA5A6904DD49BCFA3F7D3 2024-01-012024-12-31 C011963 HH2D1A6CE12E6A9F83A24FB6239FE92552 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHB9B4AC257CA1A22401754045F1EFE1D6 2023-12-31 C011963 HHB1C2E38F43BEECCBBE29B1A207F9BA6B 2024-12-31 C011963 HHA9E61508C6B923D27C0654BA95114461 2024-01-012024-12-31 C011963 HHA6103ED5387BB5B82595AD7213244522 2024-12-31 C011963 ferc:ElectricUtilityMemberferc:ElectricPlantInServiceMember 2024-12-31 C011963 Bob Glanzer 2024-01-012024-12-31 C011963 ScheduleHydroelectricGeneratingPlantStatisticsAbstract 2024-01-012024-12-31 C011963 ferc:NuclearProductionPlantMemberferc:ElectricUtilityMember 2024-01-012024-12-31 C011963 HHC22C14E8695A0D8CA56CE287F3EC9337 2024-01-012024-12-31 C011963 HHF1EB0D50DE828AB8FECD0F345EC08A5D 2024-01-012024-12-31 C011963 Aberdeen #1 Oil 2024-01-012024-12-31 C011963 ferc:DirectPayrollDistributionMember 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HHA831C8C4D019BCA02F2DF498F291FAC3 2024-01-012024-12-31 C011963 HH9B389718951AC0F50BBEC00526C6BF3E 2024-01-012024-12-31 C011963 ScheduleExtraordinaryPropertyLossesAbstract 2024-01-012024-12-31 C011963 HHFC3042B8A97C05688D6D2C7A482AD4A9 2024-01-012024-12-31 C011963 HH1485F64E028486107E8008C6BD396D7F 2024-01-012024-12-31 C011963 HH963BA527EFD90C587475E779C01B4561 2024-12-31 C011963 HHA1A6118132FF9E6BD33EC1DAF2D8F4AA 2024-12-31 C011963 HH82FB724804A45BFAD75059B1DBF8E85C 2024-01-012024-12-31 C011963 HHC2BAD8B7F4E93F9F615C1E46F3EA6FA7 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHA5D59F498B924FBDF1591674F810AA71 2023-12-31 C011963 ferc:GasUtilityMember HH5F4BDCBE299BEB86C60F038AD4B1CA66 2024-12-31 C011963 HHF88389AAA7C7E874BC66CF9EE803EB35 2024-01-012024-12-31 C011963 ferc:RegionalTransmissionAndMarketOperationMemberferc:ElectricUtilityMember 2024-01-012024-12-31 C011963 ferc:GasUtilityMember 2024-12-31 C011963 HH32DF45EC3F345B1CFF5A9D9313B9962D 2024-01-012024-12-31 C011963 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HH2A4FAB925455A5F557FA7D4EFC30AA40 2024-01-012024-06-30 C011963 HH881B3E6B87AFC2CE2C7A1267C1AB8D7B 2024-12-31 C011963 HH3D1616D0CD968DFE1A3C29129D952C84 2024-12-31 C011963 ferc:Quarter4Member South Dakota Operations 2024-01-012024-12-31 C011963 HHE3F7ABA39A030D4BA6AB51D2ACBFFDA5 2024-01-012024-12-31 C011963 ferc:GenerationStudiesMember e97f47127dbfd3f2b4cb4952c0578bdb 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HH5631D11D0F8A4E2B405FE784301C5A21 2024-01-012024-12-31 C011963 Coyote 2024-12-31 C011963 HH8981BA53B315D5879E36F126E3360BAE 2024-01-012024-12-31 C011963 HHC6A7FBE869B5D338F26C6BE58100676B 2024-01-012024-12-31 C011963 HH86E23B377A8CAB4AB615FDCB4BAB3C66 2024-01-012024-12-31 C011963 2023-01-012023-12-31 C011963 HHB1C2E38F43BEECCBBE29B1A207F9BA6B 2024-01-012024-12-31 C011963 HH456CF5261E72709E557CE343CFEF8D88 2024-01-012024-12-31 C011963 HH19CC88A9182C7F1414C34B53A5C2506E 2024-01-012024-12-31 C011963 HH1EAE40BF2058F9E2173FBEAC26A0E01A 2024-12-31 C011963 HH02D1374E29D020FC581CB43A788313EA 2024-01-012024-12-31 C011963 HH8DE9E794ADEB8B150D8F088EC29AA373 2023-12-31 C011963 HHA7B127F88885574178D47E046DFC435E 2023-12-31 C011963 HH0F3A642AED4D3AC563B8BB8B8E36993D 2024-01-012024-12-31 C011963 6d3eb7d0a143d1edda63981740667dbb 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HH7996F286D3EC0723677EF879038B6EAF 2024-12-31 C011963 ferc:HydraulicProductionPlantConventionalMemberferc:ElectricUtilityMember 2024-01-012024-12-31 C011963 2024-01-012024-09-30 C011963 ferc:MarchMember South Dakota Operations 2024-01-012024-12-31 C011963 HH049C758E299922D1062C54BA9249F55F 2024-12-31 C011963 HHB6945EF71A0E492F5CC64B3D1CC73320 2024-12-31 C011963 ferc:OtherUtilityMember HHCF1655050BEEEC4F432913340DD993F9 2023-12-31 C011963 HH3C86EAD8A70CEA587FA1341AB6595A2D 2024-01-012024-12-31 C011963 HHDE458B788D4277FF3FC8F3E920F6E7FF 2024-12-31 C011963 HH6B7AF46A22F84DED52061B8AF5ACC580 2024-01-012024-12-31 C011963 HH9DA6FEBDA2D65702DADEB2431A1401F2 2024-01-012024-12-31 C011963 HH400132DCFB1F8AFC956E19E9F2F87271 2024-12-31 C011963 915d6d39dfdfbd28a8883bba4e9637cc 2024-01-012024-12-31 C011963 ferc:SeptemberMember South Dakota Operations 2024-01-012024-12-31 C011963 HH50D3912C6236678F6BE5081DC2C6C461 2024-12-31 C011963 HH881B3E6B87AFC2CE2C7A1267C1AB8D7B 2024-01-012024-12-31 C011963 HH82FD0960A4162870E37224756C120B36 2023-12-31 C011963 HH2832A9E9D56A65912DA7ADDFBF2E5CEF 2024-01-012024-12-31 C011963 HHA16399F9F6D0177ED6226FDC8559D527 2024-01-012024-12-31 C011963 HHF22794F69CE5910CB4BE68FF9026570D 2024-01-012024-12-31 C011963 2024-12-31 C011963 HH065E7EB4EE9EEF0C8E1E167C195FF07C 2024-01-012024-12-31 C011963 2024-01-012024-03-31 C011963 HH6BBD6F50203485531A7205C6794B97B5 2024-01-012024-12-31 C011963 HHDC791CF27476FE93EC4FE921F74B2819 2024-12-31 C011963 ferc:OtherGasUtilityMember 2023-12-31 C011963 ferc:JanuaryMember South Dakota Operations 2024-01-012024-12-31 C011963 HHC390FC676F16AD41114290532914C3ED 2024-12-31 C011963 HHBBA974FD4A02840726B3E392AA729DDB 2024-01-012024-12-31 C011963 HH8584FB5473816211F2109B3627962785 2024-01-012024-12-31 C011963 HH00748667A19AD39BD41C80400D838E8C 2024-01-012024-12-31 C011963 aa011183b9d38ca73899eaf20b83a4d4 2024-01-012024-12-31 C011963 HHEF06096095AEF7B75F4A0C7BDEE6F001 2024-01-012024-12-31 C011963 HH44FE3FFCFF4E6A9201B7722C88830461 2024-01-012024-12-31 C011963 ferc:GeneralPlantMemberferc:ElectricUtilityMember 2024-01-012024-12-31 C011963 HH0A0B86BFE060AFBD84C5AAF576A8D3C7 2024-12-31 C011963 ferc:CommonUtilityMember 2024-12-31 C011963 HH1AACC982B654E9D11B4F2A4D41B99A95 2024-12-31 C011963 HHD1B2BAB678740564EF818F80A4A3A692 2024-01-012024-12-31 C011963 HH505D917B225DA76B0858B1AA3B67836F 2024-12-31 C011963 HHC5850B515E23FE6821E799D89F1D733A 2024-12-31 C011963 HH06ECF7086F0A59ED1610913EFD3F4607 2024-12-31 C011963 HHAA457A0E887DB9F73C826641427ACB49 2024-01-012024-12-31 C011963 HH0E2B507F0B13752E8EF070303917C637 2024-12-31 C011963 HH9DD21F2350EEC5741132C9B0A21BA914 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHA7B127F88885574178D47E046DFC435E 2024-01-012024-12-31 C011963 ferc:GasUtilityMember HH59A9B52200CC819BCAC3C72C39D29C5F 2024-01-012024-12-31 C011963 HH7CC108964B28461F4188FE7F0CE491E1 2024-01-012024-12-31 C011963 HHE72D6E9F79BD98496FE5E038FEEA0D3E 2024-12-31 C011963 a6953d1cc7a17bd454d9d2cd463c6928 2024-01-012024-12-31 C011963 HH9F220955ED642C6642FA961D0F198B65 2024-01-012024-12-31 C011963 HHDB11DD87464262A72EBCC3803E73C291 2024-01-012024-12-31 C011963 f24848f0ebd8090b352a34fcd345337b 2024-01-012024-12-31 C011963 ferc:Quarter2Member South Dakota Operations 2024-01-012024-12-31 C011963 HHE3F7ABA39A030D4BA6AB51D2ACBFFDA5 2024-12-31 C011963 HH44091F73F74CC40B28EBB17B676FEF56 2024-12-31 C011963 HHE748F6FCD65AC821B45304CCFA0A50B4 2024-12-31 C011963 HH5117FBFBF85D6962BD3617DAC913A15E 2024-01-012024-12-31 C011963 HH680EABD26C2B9C53859A11C3A8CAD335 2024-01-012024-12-31 C011963 Big Stone 2024-12-31 C011963 ferc:ElectricUtilityMember 87f4013d298a46a7a69d3ca4124d1607 2024-01-012024-12-31 C011963 Yankton 2024-01-012024-12-31 C011963 HH64047763A145204CDEDF824A14CA7C7C 2024-01-012024-12-31 C011963 HH74598AF814F798F2736634D9DD96F01F 2024-12-31 C011963 ferc:GasUtilityMember HH5F4BDCBE299BEB86C60F038AD4B1CA66 2024-01-012024-12-31 C011963 HH8D4CF91396CE241B4E15CB138A5C01A7 2024-01-012024-12-31 C011963 HH4962EAF590C75DC753A4F1EB5907176E 2024-12-31 C011963 2022-12-31 C011963 HH34BAEAADC49D083CB67C260C72492B1B 2024-12-31 C011963 HHC6EC7131A5B6D59849206F2B48FB92FC 2024-01-012024-12-31 C011963 ScheduleNuclearFuelMaterialsAbstract 2024-01-012024-12-31 C011963 HH963BA527EFD90C587475E779C01B4561 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember 2024-12-31 C011963 ferc:ElectricUtilityMember HHEF06096095AEF7B75F4A0C7BDEE6F001 2024-01-012024-12-31 C011963 HHA182605B4096F5717F21D8824E810225 2024-01-012024-12-31 C011963 ScheduleRegionalTransmissionServiceRevenuesAbstract 2024-01-012024-12-31 C011963 HHA5D59F498B924FBDF1591674F810AA71 2024-01-012024-12-31 C011963 HHC5ED3DE06A99A9EDE35DBD12F36A05A0 2024-12-31 C011963 39e00420b1e9c320bc5326364fa7f311 2024-01-012024-12-31 C011963 ferc:GasUtilityMember a0456a99f05778a101aac55ab1b8445f 2024-12-31 C011963 HHA952AD3A46F2B2AD3B64C40C46B3E4A6 2024-12-31 C011963 HH7D437656237472B3A42363A4230448CE 2024-12-31 C011963 ferc:AprilMember South Dakota Operations 2024-01-012024-12-31 C011963 HH67A866698A7A1D9CD07CB662B197D1C7 2024-01-012024-12-31 C011963 HHE9ED34553FEB2D0C42B2987D9C3DF31A 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember 2024-01-012024-12-31 C011963 2023-12-31 C011963 HH6248D13FDF46E2298E1BD48A89899A87 2024-01-012024-12-31 C011963 HH8D9254EEB25FC71CF2F5385764D05225 2024-12-31 C011963 HH98A0430DFE6121B2478A8EF7ECA99C00 2024-12-31 C011963 HH6248D13FDF46E2298E1BD48A89899A87 2024-12-31 C011963 HH15F87D838AA553833164C9A7744D10D6 2023-12-31 C011963 HH18BCE6B25A7F225C50870C56E8E14D0B 2024-12-31 C011963 Coyote Lime 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHE63FE557EC309D58F2B01C670ED058AF 2024-01-012024-12-31 C011963 ScheduleMonthlyTransmissionSystemPeakLoadAbstract 2024-01-012024-12-31 C011963 HH39F261BE52E4DD86EA8944AEA49A560B 2024-01-012024-12-31 C011963 HHCDE5F842DEBC4686B36AA4682D5A063F 2024-12-31 C011963 HH1E40DF4E395CDA262D7C593590163FFE 2024-01-012024-12-31 C011963 0bd4395043151582e78d354b2b0a38e8 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HH031E9FCA7BBA9732AA3C6D1AA748C84A 2024-01-012024-12-31 C011963 ScheduleSalesForResaleAbstract 2024-01-012024-12-31 C011963 HHDE458B788D4277FF3FC8F3E920F6E7FF 2024-12-31 C011963 HHCDE5F842DEBC4686B36AA4682D5A063F 2024-01-012024-12-31 C011963 HHC6A7FBE869B5D338F26C6BE58100676B 2024-01-012024-12-31 C011963 HHE945BE208E488E60111BF6C70E0C1AC7 2024-01-012024-12-31 C011963 HH57860748B8B47B6D4C90F84466341D83 2024-01-012024-12-31 C011963 Big Stone Oil 2024-01-012024-12-31 C011963 HHDE458B788D4277FF3FC8F3E920F6E7FF 2024-01-012024-12-31 C011963 HH6248D13FDF46E2298E1BD48A89899A87 2023-12-31 C011963 HH36CB34AF64FC2039E333DFF6F7987FD4 2024-12-31 C011963 HH25FDCF57EE2E25EAC08A513DA2BAE38F 2024-01-012024-12-31 C011963 HHE652B6886167EF5E151012044B94AF2F 2024-12-31 C011963 HH293F24AE826DE0408D25A45E40A13616 2023-12-31 C011963 HHC0C65D966E7B7358B59C8156C31A3849 2024-01-012024-12-31 C011963 HHAA457A0E887DB9F73C826641427ACB49 2024-12-31 C011963 HH25FDCF57EE2E25EAC08A513DA2BAE38F 2023-12-31 C011963 HH5492E4AC47183E35584BEE02A551A043 2024-12-31 C011963 ferc:DirectPayrollDistributionMember 2024-01-012024-12-31 C011963 ferc:GasUtilityMember aa011183b9d38ca73899eaf20b83a4d4 2024-12-31 C011963 HHC1DA6F570EA40C007A341092BDAB06BE 2024-12-31 C011963 ScheduleCapitalStockExpenseAbstract 2024-01-012024-12-31 C011963 f24848f0ebd8090b352a34fcd345337b 2024-12-31 C011963 HH7EFAF5F37FD9E2D6D6920F1EF4D60488 2024-12-31 C011963 2e2dfb4f5a69665bd7c97de5558dfbb6 2024-01-012024-12-31 C011963 HH898DBBC44B686D5D7CE0E3AAF1C19E6D 2024-12-31 C011963 HHE65F413CACA259AD4D81250A93266C01 2024-01-012024-12-31 C011963 HHA7B127F88885574178D47E046DFC435E 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember bda039ee8d2c3790e6912f49212662cf 2024-12-31 C011963 ferc:ElectricUtilityMember HH98A0430DFE6121B2478A8EF7ECA99C00 2024-01-012024-12-31 C011963 Neal Oil 2024-01-012024-12-31 C011963 ferc:OctoberMember South Dakota Operations 2024-01-012024-12-31 C011963 HH6311AE17C1EE52B36E68AAF4AD066387 2024-01-012024-12-31 C011963 HHCDC845BA5FDE3C6F65CFCFBBA8062278 2024-01-012024-12-31 C011963 HH43AEFBDE66952C67F9DF59F4BBD05A57 2024-12-31 C011963 HHEF5F971EFB6E8F84D4103D077DF79735 2024-12-31 C011963 HHE096770FE0E393CE837044E8F2D84DE3 2024-01-012024-12-31 C011963 42f781dd6fbe34a36f6a3c9c722489f3 2024-01-012024-12-31 C011963 ferc:OtherUtilityMember 2024-12-31 C011963 HH031E9FCA7BBA9732AA3C6D1AA748C84A 2024-01-012024-12-31 C011963 HHC2B9E59154E59E796B815862154B516D 2024-01-012024-12-31 C011963 HH26DF120EE7CCB2F7D7C9D52BD5088498 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHA5D59F498B924FBDF1591674F810AA71 2024-12-31 C011963 HH3D0970838A9A7C3120F67FEFA95D374D 2024-12-31 C011963 HH8D9254EEB25FC71CF2F5385764D05225 2024-01-012024-12-31 C011963 HH9DA6FEBDA2D65702DADEB2431A1401F2 2023-12-31 C011963 HHFC3042B8A97C05688D6D2C7A482AD4A9 2023-12-31 C011963 HHFE5856681A41A45678D705B0251842F6 2024-01-012024-12-31 C011963 HH0C0E63C1974907F700295D1ED584AAEF 2024-01-012024-12-31 C011963 HH9B00037227F28B8F18D31572392FB4C8 2024-12-31 C011963 HH59A9B52200CC819BCAC3C72C39D29C5F 2024-01-012024-12-31 C011963 HH98A069D50985E6FDE0D6EC5DA6C20D27 2024-12-31 C011963 HH7A0E90519C5B4F98E7B8528FC6CDBD44 2024-01-012024-12-31 C011963 HH8DE9E794ADEB8B150D8F088EC29AA373 2024-12-31 C011963 HHDC098F6046CB8C4BFFC117D2F4247F93 2024-01-012024-12-31 C011963 ferc:GasUtilityMember a0456a99f05778a101aac55ab1b8445f 2024-01-012024-12-31 C011963 HHFB21710AAD41F8FBA77C7CB8F20B7DF5 2024-12-31 C011963 HHDE458B788D4277FF3FC8F3E920F6E7FF 2023-12-31 C011963 HH2C5A856FF0991CD8E12CBD87A8CB2466 2024-01-012024-12-31 C011963 HHB9B4AC257CA1A22401754045F1EFE1D6 2024-01-012024-12-31 C011963 c0235d6d35700e2cdd0f64995176cf70 2024-01-012024-12-31 C011963 Neal Coal 2024-01-012024-12-31 C011963 HH64047763A145204CDEDF824A14CA7C7C 2024-12-31 C011963 HH86191393A839F52F0715A4E116F2497E 2024-01-012024-12-31 C011963 Big Stone 2024-01-012024-12-31 C011963 HH082F9687349C543C3F0E2FD3340CEC3E 2024-01-012024-09-30 C011963 HH63356649C9480FBD5C0174B7E6580C24 2024-01-012024-12-31 C011963 HH0242A700D5E52E2B7EB123DCCED43A00 2024-01-012024-12-31 C011963 HH7D437656237472B3A42363A4230448CE 2024-01-012024-12-31 C011963 HH34BAEAADC49D083CB67C260C72492B1B 2024-01-012024-12-31 C011963 HHE652B6886167EF5E151012044B94AF2F 2024-01-012024-12-31 C011963 HH275975AE44D14278C143B2206BBD0B9B 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHA6103ED5387BB5B82595AD7213244522 2024-01-012024-12-31 C011963 3ea366832886e372fd04875ffe342f59 2024-01-012024-12-31 C011963 eaf6ad0246e8e32cb65ab1257ecab0b1 2024-01-012024-12-31 C011963 Oil 2024-01-012024-12-31 C011963 HHB261C9784E59437BD309BFE407BDFAAB 2024-12-31 C011963 HH3232A6A67C6426B63BCCE47B53676A47 2024-01-012024-12-31 C011963 HHACF897EA660F865F3A879E6E766EEE15 2024-01-012024-12-31 C011963 HH9928AB8C6529F1C75DFB19DC95BEBA80 2024-01-012024-12-31 C011963 HHC5ED3DE06A99A9EDE35DBD12F36A05A0 2024-01-012024-12-31 C011963 ferc:OtherUtilityMember 2023-01-012023-12-31 C011963 HH6E19628685CC6F3373A1CF99BF8D970F 2024-12-31 C011963 453ed6eb00c319088411dcab93764a92 2024-01-012024-12-31 C011963 HHA8F9FFF0B9861EAC1B2BDE42B14FD3CF 2024-01-012024-12-31 C011963 HHE096770FE0E393CE837044E8F2D84DE3 2024-12-31 C011963 HH18BCE6B25A7F225C50870C56E8E14D0B 2024-01-012024-12-31 C011963 HH910AB18795B283AE568723F2862ECD01 2024-12-31 C011963 HHF13F279E8D9DFF2AA7FCA79847BF3454 2024-01-012024-12-31 C011963 ae57719e982cf1d9b8509d66753aec85 2024-01-012024-12-31 C011963 HHBBA974FD4A02840726B3E392AA729DDB 2024-12-31 C011963 9f12c24f94c5387b30614144f502e7b5 2024-01-012024-12-31 C011963 HHA16399F9F6D0177ED6226FDC8559D527 2024-12-31 C011963 ferc:GasUtilityMember HH6A7514731F394284013DD7CDD7391976 2024-12-31 C011963 d8ff5acdcfb8c0650457c27cc0869ac4 2024-01-012024-12-31 C011963 ferc:AugustMember South Dakota Operations 2024-01-012024-12-31 C011963 HH5D503FC419A855A7A35C2748DF5AA7D2 2023-12-31 C011963 ferc:ElectricUtilityMember HH6E19628685CC6F3373A1CF99BF8D970F 2024-01-012024-12-31 C011963 HH96C8C75DEEC981F1DE6E7CE10A10D3E7 2023-12-31 C011963 ScheduleTransmissionOfElectricityByIsoOrRtoAbstract 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHA8F9FFF0B9861EAC1B2BDE42B14FD3CF 2024-12-31 C011963 ferc:GasUtilityMember HH5CF5843E7EF02523C0E8735AC48F41EB 2024-01-012024-12-31 C011963 HH6947F07E55DAE633BE12A01BDAD4FD61 2024-12-31 C011963 HHDB11DD87464262A72EBCC3803E73C291 2024-12-31 C011963 ferc:TransmissionStudiesMember 2024-01-012024-12-31 C011963 0ad684089838607d72d3b3e343a8a178 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HH802E01C532FA9CB1EF2B3D1810F72DDA 2024-01-012024-12-31 C011963 HH1FACCB5FE08D0FCEB2818AE28A5800E3 2024-12-31 C011963 HH1FACCB5FE08D0FCEB2818AE28A5800E3 2024-01-012024-12-31 C011963 HH82FB724804A45BFAD75059B1DBF8E85C 2023-12-31 C011963 HHBE9B64385A16167092AFE10A82B44242 2024-01-012024-12-31 C011963 HH802E01C532FA9CB1EF2B3D1810F72DDA 2023-12-31 C011963 HHCBDEE3D59E14B74EBE80ACB64943D1C8 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember 87f4013d298a46a7a69d3ca4124d1607 2023-12-31 C011963 HH3D0970838A9A7C3120F67FEFA95D374D 2024-01-012024-12-31 C011963 HH8584FB5473816211F2109B3627962785 2023-12-31 C011963 HH2D1A6CE12E6A9F83A24FB6239FE92552 2024-12-31 C011963 HH6947F07E55DAE633BE12A01BDAD4FD61 2024-01-012024-12-31 C011963 HH3F3E9E2E098BC9BEC5B1244087E556B6 2024-01-012024-12-31 C011963 HHC1DA6F570EA40C007A341092BDAB06BE 2024-01-012024-12-31 C011963 HHB6945EF71A0E492F5CC64B3D1CC73320 2024-01-012024-12-31 C011963 SchedulePurchasesSalesOfAncillaryServicesAbstract 2024-01-012024-12-31 C011963 HH36EA106DFC22137E0B5495F8AF5687B1 2024-01-012024-12-31 C011963 HHCBDEE3D59E14B74EBE80ACB64943D1C8 2024-12-31 C011963 HHE63FE557EC309D58F2B01C670ED058AF 2024-12-31 C011963 HH0E2B507F0B13752E8EF070303917C637 2024-01-012024-12-31 C011963 HH36ACD32059FB4B72367B5C302663742A 2024-01-012024-12-31 C011963 HH4D28358DE0C8F4A433EF66204D1F0D17 2024-12-31 C011963 ferc:ElectricUtilityMember HHA8F9FFF0B9861EAC1B2BDE42B14FD3CF 2024-01-012024-12-31 C011963 ferc:GenerationStudiesMember c0235d6d35700e2cdd0f64995176cf70 2024-01-012024-12-31 C011963 ferc:GasUtilityMember HHBCECA9ACF51EA7D6A49E5E9669397527 2024-12-31 C011963 HH6A2813A7D31276B39D54B578B19E2EA0 2024-12-31 C011963 e97f47127dbfd3f2b4cb4952c0578bdb 2024-01-012024-12-31 C011963 HHDE50A970AC63FEE482558CCE9CBD4238 2024-01-012024-12-31 C011963 HH5B2DFF5B695AB5F1B55728ACBC142860 2024-01-012024-12-31 C011963 HH082F9687349C543C3F0E2FD3340CEC3E 2024-01-012024-12-31 C011963 HHA654839B3B721E9BB8F69B776E75A9BB 2024-01-012024-12-31 C011963 HH8ABCBCCDAD278F4631B380EA1528DBAD 2024-01-012024-12-31 C011963 HHB85786385EB5A918701B858E6AD7DE55 2024-12-31 C011963 HH646A75F2300B05E1ED15334D8440F47F 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHCD0E44E2C1557F8BE1FBE357B5DE8FC5 2023-12-31 C011963 HH27AB0B5AD295AD272D348C7691EF811D 2024-01-012024-12-31 C011963 HH326A7C3355CAC7C902830A9CFEF2878C 2024-12-31 C011963 ferc:ElectricUtilityMember HH9DA6FEBDA2D65702DADEB2431A1401F2 2024-01-012024-12-31 C011963 ScheduleResearchDevelopmentOrDemonstrationExpendituresAbstract 2024-01-012024-12-31 C011963 ferc:DirectPayrollDistributionMember HH1485F64E028486107E8008C6BD396D7F 2024-01-012024-12-31 C011963 2024-01-012024-06-30 C011963 ferc:TransmissionStudiesMember 2a61da7c525cec6d8c7d5f4d55a2afe1 2024-01-012024-12-31 C011963 ferc:OtherProductionPlantMemberferc:ElectricUtilityMember 2024-01-012024-12-31 C011963 HH6A7514731F394284013DD7CDD7391976 2024-01-012024-12-31 C011963 HH82FD0960A4162870E37224756C120B36 2024-01-012024-12-31 C011963 HHE977C64DC1E947E1C7E645E4570B1749 2024-01-012024-12-31 C011963 HHA4A850F57C454E76EA6DF894F4474BEE 2024-01-012024-12-31 C011963 HH082F9687349C543C3F0E2FD3340CEC3E 2024-01-012024-03-31 C011963 HH44FE3FFCFF4E6A9201B7722C88830461 2024-12-31 C011963 HH36CB34AF64FC2039E333DFF6F7987FD4 2024-01-012024-12-31 C011963 ferc:TransmissionPlantMemberferc:ElectricUtilityMember 2024-01-012024-12-31 C011963 HH646A75F2300B05E1ED15334D8440F47F 2024-12-31 C011963 HH0F3A642AED4D3AC563B8BB8B8E36993D 2024-12-31 C011963 HHEF06096095AEF7B75F4A0C7BDEE6F001 2023-12-31 C011963 HH4962EAF590C75DC753A4F1EB5907176E 2024-01-012024-12-31 C011963 HHBBDCAD31B047D7AC256B0FF11432475E 2024-01-012024-12-31 C011963 HHB261C9784E59437BD309BFE407BDFAAB 2023-12-31 C011963 HHA9F35768A62E1E4732C9A313D12C0046 2024-01-012024-12-31 C011963 HHF3EECEEDFDB87186E0F6DEA42C1CF787 2024-01-012024-12-31 C011963 HH3CAD28A2181B66EAF919BB9CDFC62CCE 2023-12-31 C011963 HHA6103ED5387BB5B82595AD7213244522 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHFC3042B8A97C05688D6D2C7A482AD4A9 2024-01-012024-12-31 C011963 HH98A0430DFE6121B2478A8EF7ECA99C00 2024-01-012024-12-31 C011963 ferc:OtherElectricUtilityMember 2023-12-31 C011963 ferc:Quarter1Member South Dakota Operations 2024-01-012024-12-31 C011963 Coal 2024-01-012024-12-31 C011963 HH049C758E299922D1062C54BA9249F55F 2024-01-012024-12-31 C011963 HH98A0430DFE6121B2478A8EF7ECA99C00 2023-12-31 C011963 Bob Glanzer Gas 2024-01-012024-12-31 C011963 HHE945BE208E488E60111BF6C70E0C1AC7 2024-12-31 C011963 HH5D503FC419A855A7A35C2748DF5AA7D2 2024-01-012024-12-31 C011963 HH293F24AE826DE0408D25A45E40A13616 2024-01-012024-12-31 C011963 ferc:JuneMember South Dakota Operations 2024-01-012024-12-31 C011963 HH5492E4AC47183E35584BEE02A551A043 2023-12-31 C011963 Beethoven Wind 2024-12-31 C011963 ferc:ElectricUtilityMember 87f4013d298a46a7a69d3ca4124d1607 2024-12-31 C011963 HHE63FE557EC309D58F2B01C670ED058AF 2024-01-012024-12-31 C011963 7fc8527fc9c886231c900009d38c9bb0 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHB9B4AC257CA1A22401754045F1EFE1D6 2024-12-31 C011963 HHFB21710AAD41F8FBA77C7CB8F20B7DF5 2024-01-012024-12-31 C011963 5ce1d5a5f6f9c61bf0a8821b3504c760 2024-01-012024-12-31 C011963 Bob Glanzer 2024-12-31 C011963 Aberdeen #2 2024-01-012024-12-31 C011963 HH8584FB5473816211F2109B3627962785 2024-12-31 C011963 HHC793DDF0091C4F07817DF55F93548023 2023-12-31 C011963 HH205B5F2926079351DD57BDB8808C57B8 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HH6248D13FDF46E2298E1BD48A89899A87 2024-01-012024-12-31 C011963 HH898DBBC44B686D5D7CE0E3AAF1C19E6D 2024-01-012024-12-31 C011963 HH3C86EAD8A70CEA587FA1341AB6595A2D 2024-12-31 C011963 HHC22C14E8695A0D8CA56CE287F3EC9337 2024-12-31 C011963 HH21D0EDF1E740A8B184BAEA80C49B2AD5 2024-12-31 C011963 HH2A4FAB925455A5F557FA7D4EFC30AA40 2024-01-012024-09-30 C011963 HH501891E9EBE6719FE33BE22E9E85B4E9 2024-01-012024-12-31 C011963 HH5631D11D0F8A4E2B405FE784301C5A21 2024-01-012024-12-31 C011963 HHE9ED34553FEB2D0C42B2987D9C3DF31A 2024-12-31 C011963 HH5FD23F83EF8606A59B5070A18E4868A1 2024-01-012024-12-31 C011963 HH293F24AE826DE0408D25A45E40A13616 2024-12-31 C011963 ferc:ElectricUtilityMember HH96C8C75DEEC981F1DE6E7CE10A10D3E7 2024-01-012024-12-31 C011963 HH7A0E90519C5B4F98E7B8528FC6CDBD44 2024-12-31 C011963 HHDCCA213A5B4AD706FB988BE49899B30E 2024-01-012024-12-31 C011963 ferc:DistributionPlantMemberferc:ElectricUtilityMember 2024-01-012024-12-31 C011963 HH96B0141273EABAB320119C467CDCAF17 2024-12-31 C011963 HH8F0CF7BE5B10D2734684B5C98AC143C3 2024-12-31 C011963 HH9B00037227F28B8F18D31572392FB4C8 2024-01-012024-12-31 C011963 HHAE1D020038A3A631FFC3F6D794767C49 2024-01-012024-12-31 C011963 HH74598AF814F798F2736634D9DD96F01F 2024-01-012024-12-31 C011963 ferc:OtherUtilityMember 2023-12-31 C011963 HHA97FEDBCE30ECFBC5F77F23789B0EE00 2024-12-31 C011963 HHCD0E44E2C1557F8BE1FBE357B5DE8FC5 2024-01-012024-12-31 C011963 ferc:GasUtilityMember aa011183b9d38ca73899eaf20b83a4d4 2024-01-012024-12-31 C011963 HHFC3042B8A97C05688D6D2C7A482AD4A9 2024-12-31 C011963 ferc:OperatingUtilityMember 2024-01-012024-12-31 C011963 Aberdeen #2 Oil 2024-01-012024-12-31 C011963 HH7CC108964B28461F4188FE7F0CE491E1 2024-12-31 C011963 a0456a99f05778a101aac55ab1b8445f 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HH688CC27FCF4F2F2A7CE2F97B111E7A87 2024-12-31 C011963 ferc:Quarter3Member South Dakota Operations 2024-01-012024-12-31 C011963 HH0BA1DF257C357A1605546589DAE2138D 2024-01-012024-12-31 C011963 ferc:GasUtilityMember 2024-01-012024-12-31 C011963 HH5492E4AC47183E35584BEE02A551A043 2024-01-012024-12-31 C011963 HH2A4FAB925455A5F557FA7D4EFC30AA40 2024-01-012024-03-31 C011963 Aberdeen #2 Gas 2024-01-012024-12-31 C011963 HH36EA106DFC22137E0B5495F8AF5687B1 2024-12-31 C011963 Aberdeen #1 2024-01-012024-12-31 C011963 HH19147ECB403FF5CB3BF6812E1CBFB909 2024-01-012024-12-31 C011963 HHFF66C82A968C746440A84BCA2AEF87A9 2024-12-31 C011963 ScheduleAccumulatedDeferredIncomeTaxesAcceleratedAmortizationPropertyAbstract 2024-01-012024-12-31 C011963 ferc:GenerationStudiesMember fcc0ead1e75ac21d381a25e12111ed37 2024-01-012024-12-31 C011963 HH9934318DC5D65BEA8C15707CF8E006B5 2024-01-012024-12-31 C011963 HH1EAE40BF2058F9E2173FBEAC26A0E01A 2024-01-012024-12-31 C011963 HHFD52C74266AE0CD948F75C5E8580DB27 2024-12-31 C011963 ferc:ElectricUtilityMemberferc:ElectricPlantInServiceMember 2024-01-012024-12-31 C011963 HH5B2DFF5B695AB5F1B55728ACBC142860 2024-12-31 C011963 eebf5c94c05604b17cc71aeeb1e87ac5 2024-01-012024-12-31 C011963 HHECD3CAD1C9FD654F5F60015A01AD562B 2024-01-012024-12-31 C011963 Big Stone Coal 2024-01-012024-12-31 C011963 HHBBDCAD31B047D7AC256B0FF11432475E 2024-12-31 C011963 HH286E9E86C62656B7001F35E7733FD845 2024-01-012024-12-31 C011963 HH67658B7C99CE439B5716100DDE7AF9B0 2023-12-31 C011963 HH86FC207E29ABD735661863E6FF0AC9F5 2024-12-31 C011963 HH0F5F972D2B42863457373661F530042E 2024-01-012024-12-31 C011963 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HH4FA44F6986EABEAE551C3EFC27434718 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHA5D59F498B924FBDF1591674F810AA71 2024-01-012024-12-31 C011963 HHC390FC676F16AD41114290532914C3ED 2024-01-012024-12-31 C011963 HH51BD5FFB663C8198E1720D742782F5A9 2024-01-012024-12-31 C011963 ferc:OtherUtilityMember 2024-01-012024-12-31 C011963 HH0C0E63C1974907F700295D1ED584AAEF 2024-12-31 C011963 HHA0A6C250C667D01C5BCD76A7AFB4DF48 2024-01-012024-12-31 C011963 HH82FB724804A45BFAD75059B1DBF8E85C 2024-12-31 C011963 ferc:GasUtilityMember 2023-12-31 C011963 HH96C8C75DEEC981F1DE6E7CE10A10D3E7 2024-12-31 C011963 HHE65EB464FAA579BDB1AABDC06B52C855 2024-12-31 C011963 HHA4CFB10D7D25A7B079ED7971116A9DB9 2024-01-012024-12-31 C011963 HH13A019A44A6F6ECF27CC0C54A643D4F7 2024-01-012024-12-31 C011963 ScheduleElectricPlantHeldForFutureUseAbstract 2024-01-012024-12-31 C011963 HH802E01C532FA9CB1EF2B3D1810F72DDA 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember bda039ee8d2c3790e6912f49212662cf 2023-12-31 C011963 ferc:OtherUtilityMember HHCF1655050BEEEC4F432913340DD993F9 2024-12-31 C011963 HH06ECF7086F0A59ED1610913EFD3F4607 2024-01-012024-12-31 C011963 HH79AD9110299F041A2B8BDCFF7EF8C67F 2024-01-012024-12-31 C011963 HHF137667547FDA5A6904DD49BCFA3F7D3 2024-12-31 C011963 HHF137667547FDA5A6904DD49BCFA3F7D3 2024-01-012024-12-31 C011963 ferc:HydraulicProductionPlantPumpedStorageMemberferc:ElectricUtilityMember 2024-01-012024-12-31 C011963 HH7996F286D3EC0723677EF879038B6EAF 2024-01-012024-12-31 C011963 HHFFA6E5D66DDBC4A1CBABB10AACDF6EC6 2024-01-012024-12-31 C011963 HH14C86835CD39E33762489610B3FCF8B8 2024-01-012024-12-31 C011963 HHC663AD85C37A2F2218898DD9D44B3F3F 2024-01-012024-12-31 C011963 HH7D3C80A7DC4D704F09312C64020EA73D 2024-01-012024-12-31 C011963 HHDC791CF27476FE93EC4FE921F74B2819 2024-01-012024-12-31 C011963 HH7F0B822708A50A0749020FD2F741A22F 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HH7996F286D3EC0723677EF879038B6EAF 2024-01-012024-12-31 C011963 HH11DBF2EDE60B29026C524F8ED3F2D4CC 2024-01-012024-12-31 C011963 ferc:GasUtilityMember HH5CF5843E7EF02523C0E8735AC48F41EB 2024-12-31 C011963 HHE65EB464FAA579BDB1AABDC06B52C855 2024-01-012024-12-31 C011963 87f4013d298a46a7a69d3ca4124d1607 2024-01-012024-12-31 C011963 HH67658B7C99CE439B5716100DDE7AF9B0 2024-12-31 C011963 HHB2F44C444B8E86B2CA19459A49D57A84 2024-12-31 C011963 ferc:GasUtilityMember HH59A9B52200CC819BCAC3C72C39D29C5F 2024-12-31 C011963 HHD374552B1B2CF65116724EBC5730F5AE 2024-01-012024-12-31 C011963 HH5CF5843E7EF02523C0E8735AC48F41EB 2024-01-012024-12-31 C011963 HH2ED9913DCD3F3EBF4EFF6E8F72D3B7A3 2024-12-31 C011963 HH5F4BDCBE299BEB86C60F038AD4B1CA66 2024-01-012024-12-31 C011963 HH96C3132C7B41CF1F2996E84E27A33BFB 2024-01-012024-12-31 C011963 ferc:MayMember South Dakota Operations 2024-01-012024-12-31 C011963 Beethoven Wind 2024-01-012024-12-31 C011963 HHF61D102B9A9F0A1CB48F1CD2C144BF6C 2024-12-31 C011963 cdb23a9b5bad80df0e96bb91cad681eb 2024-01-012024-12-31 C011963 HH3DC7FD5DE724B6195F50D291165CD1A0 2024-01-012024-12-31 C011963 HH3CAD28A2181B66EAF919BB9CDFC62CCE 2024-01-012024-12-31 C011963 HHA952AD3A46F2B2AD3B64C40C46B3E4A6 2024-01-012024-12-31 C011963 HHE63FE557EC309D58F2B01C670ED058AF 2023-12-31 C011963 ferc:OtherGasUtilityMember 2024-12-31 C011963 d8661a8443f1f008bfceb3d8c40d6cfc 2024-01-012024-12-31 C011963 Coyote 2024-01-012024-12-31 C011963 ScheduleAllowanceInventoryAbstract 2024-01-012024-12-31 C011963 HHDB7894B0E600D029DA8F29ABF709540C 2024-01-012024-12-31 C011963 Neal 2024-01-012024-12-31 C011963 HHFF66C82A968C746440A84BCA2AEF87A9 2024-01-012024-12-31 C011963 HH6A2813A7D31276B39D54B578B19E2EA0 2023-12-31 C011963 HH96C8C75DEEC981F1DE6E7CE10A10D3E7 2024-01-012024-12-31 C011963 HHA6103ED5387BB5B82595AD7213244522 2023-12-31 C011963 HHB261C9784E59437BD309BFE407BDFAAB 2024-01-012024-12-31 C011963 2a61da7c525cec6d8c7d5f4d55a2afe1 2024-01-012024-12-31 C011963 HHD1B2BAB678740564EF818F80A4A3A692 2024-12-31 C011963 HH5FD23F83EF8606A59B5070A18E4868A1 2024-12-31 C011963 Gas 2024-01-012024-12-31 C011963 HH1E40DF4E395CDA262D7C593590163FFE 2024-12-31 C011963 HH9928AB8C6529F1C75DFB19DC95BEBA80 2024-12-31 C011963 HHECD3CAD1C9FD654F5F60015A01AD562B 2024-12-31 C011963 HH7F0B822708A50A0749020FD2F741A22F 2024-12-31 C011963 HH0F5F972D2B42863457373661F530042E 2024-12-31 C011963 ferc:DecemberMember South Dakota Operations 2024-01-012024-12-31 C011963 HHBEE6A4F0FFD3396845F34E03E402AB47 2024-12-31 C011963 HH4D28358DE0C8F4A433EF66204D1F0D17 2024-01-012024-12-31 C011963 HHB2F44C444B8E86B2CA19459A49D57A84 2023-12-31 C011963 ferc:ElectricUtilityMember HHFFA6E5D66DDBC4A1CBABB10AACDF6EC6 2024-01-012024-12-31 C011963 HH3D1616D0CD968DFE1A3C29129D952C84 2024-01-012024-12-31 C011963 ScheduleUnrecoveredPlantAndRegulatoryStudyCostsAbstract 2024-01-012024-12-31 C011963 HHA0ACF7CF3D32A02D9FB4148A259899F3 2024-01-012024-12-31 C011963 HH2A4FAB925455A5F557FA7D4EFC30AA40 2024-01-012024-12-31 C011963 Yankton 2024-12-31 C011963 ferc:ElectricUtilityMember HH86FC207E29ABD735661863E6FF0AC9F5 2024-01-012024-12-31 C011963 HH547664D5F062ABB9A7CD4CBB083DB31A 2024-01-012024-12-31 C011963 HH7EFAF5F37FD9E2D6D6920F1EF4D60488 2024-01-012024-12-31 C011963 HH11DBF2EDE60B29026C524F8ED3F2D4CC 2024-12-31 C011963 ferc:ElectricUtilityMember HHCD0E44E2C1557F8BE1FBE357B5DE8FC5 2024-12-31 C011963 368e278fc82d2c69c9b2281fdc84b4a1 2024-01-012024-12-31 C011963 HH50D3912C6236678F6BE5081DC2C6C461 2024-01-012024-12-31 C011963 HH326A7C3355CAC7C902830A9CFEF2878C 2024-01-012024-12-31 C011963 HHED9B5D93B10F95F9330832F1FD93753B 2023-12-31 C011963 HH091EE5C795D6989C5DA226BA5E17BC40 2024-12-31 C011963 f66b8687ece80c3da1a995c91992c143 2024-01-012024-12-31 C011963 HH680EABD26C2B9C53859A11C3A8CAD335 2024-12-31 C011963 HHB040B251AE116607EBCB7DC5CFFDFA4F 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHB2F44C444B8E86B2CA19459A49D57A84 2024-01-012024-12-31 C011963 HHFE412A537F65D848FA084BD296031969 2024-12-31 C011963 HH8DEE1ED2E6A3015D91C4264DC901DFCB 2024-01-012024-12-31 C011963 HH98A069D50985E6FDE0D6EC5DA6C20D27 2024-01-012024-12-31 C011963 HH43AEFBDE66952C67F9DF59F4BBD05A57 2024-01-012024-12-31 C011963 HH96B0141273EABAB320119C467CDCAF17 2024-01-012024-12-31 C011963 HH910AB18795B283AE568723F2862ECD01 2024-01-012024-12-31 C011963 HH52DC67111152931411C1BC73B25D8025 2024-01-012024-12-31 C011963 HHC6EC7131A5B6D59849206F2B48FB92FC 2024-12-31 C011963 39e00420b1e9c320bc5326364fa7f311 2024-12-31 C011963 HH74598AF814F798F2736634D9DD96F01F 2023-12-31 C011963 d3c2fe838e2dc4d9e88a0231bd6e59cd 2024-01-012024-12-31 C011963 ferc:GasUtilityMember HH5CF5843E7EF02523C0E8735AC48F41EB 2023-12-31 C011963 HHFFA6E5D66DDBC4A1CBABB10AACDF6EC6 2024-12-31 C011963 f24848f0ebd8090b352a34fcd345337b 2023-12-31 C011963 ferc:GasUtilityMember HH59A9B52200CC819BCAC3C72C39D29C5F 2023-12-31 C011963 34c74eac662aae76df5a4bb335d5d478 2024-01-012024-12-31 C011963 HH031E9FCA7BBA9732AA3C6D1AA748C84A 2023-12-31 C011963 HH6E19628685CC6F3373A1CF99BF8D970F 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember bda039ee8d2c3790e6912f49212662cf 2024-01-012024-12-31 C011963 HH8F0CF7BE5B10D2734684B5C98AC143C3 2024-01-012024-12-31 C011963 Lime 2024-01-012024-12-31 C011963 HHBED3B9618276823FA3D9698B7E3F21D5 2024-01-012024-12-31 C011963 HHDAEAF7FB287559D30D6F4ED7B121CAE0 2024-01-012024-12-31 C011963 HH00653409ABCE3C9E0E0262BA66C0F93B 2024-01-012024-12-31 C011963 Neal 2024-12-31 C011963 HHFC605604B339AC1A45D8BC2DA6C73C49 2024-12-31 C011963 South Dakota Operations 2024-01-012024-12-31 C011963 HHA9E61508C6B923D27C0654BA95114461 2024-12-31 C011963 HHA654839B3B721E9BB8F69B776E75A9BB 2024-12-31 C011963 ferc:ElectricUtilityMember HH82FB724804A45BFAD75059B1DBF8E85C 2024-01-012024-12-31 C011963 HH8DE9E794ADEB8B150D8F088EC29AA373 2024-01-012024-12-31 C011963 HH32DF45EC3F345B1CFF5A9D9313B9962D 2024-12-31 C011963 ferc:CommonPlantElectricMemberferc:ElectricUtilityMember 2024-01-012024-12-31 C011963 HH4FA44F6986EABEAE551C3EFC27434718 2024-12-31 C011963 HH62E12A50EEA938F0ACCB0548401859D0 2024-01-012024-12-31 C011963 HHA1A6118132FF9E6BD33EC1DAF2D8F4AA 2024-01-012024-12-31 C011963 HHBE13D32D29581C90D80142E37D81C230 2024-12-31 C011963 3595e051d519de28c0667be766578e6e 2024-01-012024-12-31 C011963 HHED9B5D93B10F95F9330832F1FD93753B 2024-12-31 C011963 HHF137667547FDA5A6904DD49BCFA3F7D3 2023-12-31 C011963 HH02D1374E29D020FC581CB43A788313EA 2024-12-31 C011963 HHACF897EA660F865F3A879E6E766EEE15 2024-12-31 C011963 HH6A2813A7D31276B39D54B578B19E2EA0 2024-01-012024-12-31 C011963 HH86E23B377A8CAB4AB615FDCB4BAB3C66 2024-12-31 C011963 HH5989C5BCBBB8D75BBB7DCA94461778F1 2024-12-31 C011963 HH51BD5FFB663C8198E1720D742782F5A9 2024-12-31 C011963 ferc:ElectricUtilityMember HH5492E4AC47183E35584BEE02A551A043 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HHCD0E44E2C1557F8BE1FBE357B5DE8FC5 2024-01-012024-12-31 C011963 HHFC605604B339AC1A45D8BC2DA6C73C49 2024-01-012024-12-31 C011963 HHF51A7BE8595A06CCD930856689E2F9F7 2024-01-012024-12-31 C011963 ferc:ElectricUtilityMember HH688CC27FCF4F2F2A7CE2F97B111E7A87 2024-01-012024-12-31 C011963 ferc:GenerationStudiesMember 2024-01-012024-12-31 C011963 HH15F87D838AA553833164C9A7744D10D6 2024-12-31 C011963 ferc:OperatingUtilityMember 2024-12-31 C011963 ferc:IntangiblePlantMemberferc:ElectricUtilityMember 2024-01-012024-12-31 C011963 HHE977C64DC1E947E1C7E645E4570B1749 2024-12-31 C011963 HH6E2BB642BA020F60E2A88E80B9FE734E 2024-01-012024-12-31 C011963 HH091EE5C795D6989C5DA226BA5E17BC40 2024-01-012024-12-31 C011963 HHA4A850F57C454E76EA6DF894F4474BEE 2024-12-31 C011963 HH2D1A6CE12E6A9F83A24FB6239FE92552 2023-12-31 C011963 HH82FD0960A4162870E37224756C120B36 2024-12-31 C011963 HH36A23D2DBB508979ACD6F221115BC4D1 2024-01-012024-12-31 C011963 ferc:JulyMember South Dakota Operations 2024-01-012024-12-31 C011963 HH6D8939B5C21EE2FF0990DDF26FF26336 2024-01-012024-12-31 C011963 ferc:OperatingUtilityMember 2023-12-31 C011963 HHE748F6FCD65AC821B45304CCFA0A50B4 2024-01-012024-12-31 C011963 Coyote Coal 2024-01-012024-12-31 C011963 HHFE412A537F65D848FA084BD296031969 2023-12-31 C011963 HH1AACC982B654E9D11B4F2A4D41B99A95 2024-01-012024-12-31 C011963 ScheduleElectricPropertyLeasedToOthersAbstract 2024-01-012024-12-31 C011963 HHB2F44C444B8E86B2CA19459A49D57A84 2024-01-012024-12-31 C011963 HHFE412A537F65D848FA084BD296031969 2024-01-012024-12-31 C011963 HH15F87D838AA553833164C9A7744D10D6 2024-01-012024-12-31 C011963 HHEF5F971EFB6E8F84D4103D077DF79735 2024-01-012024-12-31 C011963 ScheduleInvestmentsInSubsidiaryCompaniesAbstract 2024-01-012024-12-31 C011963 SchedulePumpedStorageGeneratingPlantStatisticsAbstract 2024-01-012024-12-31 C011963 HHCF1655050BEEEC4F432913340DD993F9 2024-01-012024-12-31 C011963 Coyote Oil 2024-01-012024-12-31 C011963 HH79AD9110299F041A2B8BDCFF7EF8C67F 2024-12-31 C011963 ferc:ElectricUtilityMember HH688CC27FCF4F2F2A7CE2F97B111E7A87 2023-12-31 C011963 HHA9BFBDD3E6C226186526B185AFBE7FD8 2024-01-012024-12-31 C011963 ferc:OtherUtilityMember HHCF1655050BEEEC4F432913340DD993F9 2024-01-012024-12-31 C011963 HH6E19628685CC6F3373A1CF99BF8D970F 2023-12-31 C011963 HH06ECF7086F0A59ED1610913EFD3F4607 2023-12-31 C011963 fdd392c1030582dbad91303767ad175b 2024-01-012024-12-31 C011963 HH35AA5464C970996BC8809264263E3B82 2024-01-012024-12-31 C011963 HHA16399F9F6D0177ED6226FDC8559D527 2023-12-31 C011963 HH1C487E2D0A13650C966507006F14C381 2024-01-012024-12-31 C011963 HH0A7013E1D85EDD4BD54FD67394606F0D 2024-01-012024-12-31 iso4217:USD xbrli:shares utr:Btu xbrli:pure utr:MW iso4217:USD utr:MMBTU utr:Btu utr:kWh iso4217:USD utr:kWh iso4217:USD utr:kW utr:mi utr:MWh utr:kV utr:kWh utr:MVA iso4217:USD utr:MW
THIS FILING IS
Item 1:
An Initial (Original) Submission
OR
Resubmission No.

FERC FINANCIAL REPORT
FERC FORM No. 1: Annual Report of
Major Electric Utilities, Licensees
and Others and Supplemental
Form 3-Q: Quarterly Financial Report

These reports are mandatory under the Federal Power Act, Sections 3, 4(a), 304 and 309, and 18 CFR 141.1 and 141.400. Failure to report may result in criminal fines, civil penalties and other sanctions as provided by law. The Federal Energy Regulatory Commission does not consider these reports to be of confidential nature
Exact Legal Name of Respondent (Company)

NorthWestern Energy Public Service Corporation
Year/Period of Report

End of:
2024
/
Q4


INSTRUCTIONS FOR FILING FERC FORM NOS. 1 and 3-Q

GENERAL INFORMATION

  1. Purpose

    FERC Form No. 1 (FERC Form 1) is an annual regulatory requirement for Major electric utilities, licensees and others (18 C.F.R. § 141.1). FERC Form No. 3-Q ( FERC Form 3-Q) is a quarterly regulatory requirement which supplements the annual financial reporting requirement (18 C.F.R. § 141.400). These reports are designed to collect financial and operational information from electric utilities, licensees and others subject to the jurisdiction of the Federal Energy Regulatory Commission. These reports are also considered to be non-confidential public use forms.
  2. Who Must Submit

    Each Major electric utility, licensee, or other, as classified in the Commission’s Uniform System of Accounts Prescribed for Public Utilities, Licensees, and Others Subject To the Provisions of The Federal Power Act (18 C.F.R. Part 101), must submit FERC Form 1 (18 C.F.R. § 141.1), and FERC Form 3-Q (18 C.F.R. § 141.400).

    Note: Major means having, in each of the three previous calendar years, sales or transmission service that exceeds one of the following:
    1. one million megawatt hours of total annual sales,
    2. 100 megawatt hours of annual sales for resale,
    3. 500 megawatt hours of annual power exchanges delivered, or
    4. 500 megawatt hours of annual wheeling for others (deliveries plus losses).
  3. What and Where to Submit

    1. Submit FERC Form Nos. 1 and 3-Q electronically through the eCollection portal at https://eCollection.ferc.gov, and according to the specifications in the Form 1 and 3-Q taxonomies.
    2. The Corporate Officer Certification must be submitted electronically as part of the FERC Forms 1 and 3-Q filings.
    3. Submit immediately upon publication, by either eFiling or mail, two (2) copies to the Secretary of the Commission, the latest Annual Report to Stockholders. Unless eFiling the Annual Report to Stockholders, mail the stockholders report to the Secretary of the Commission at:
      Secretary
      Federal Energy Regulatory Commission 888 First Street, NE
      Washington, DC 20426
    4. For the CPA Certification Statement, submit within 30 days after filing the FERC Form 1, a letter or report (not applicable to filers classified as Class C or Class D prior to January 1, 1984). The CPA Certification Statement can be either eFiled or mailed to the Secretary of the Commission at the address above.

      The CPA Certification Statement should:
      1. Attest to the conformity, in all material aspects, of the below listed (schedules and pages) with the Commission's applicable Uniform System of Accounts (including applicable notes relating thereto and the Chief Accountant's published accounting releases), and
      2. Be signed by independent certified public accountants or an independent licensed public accountant certified or licensed by a regulatory authority of a State or other political subdivision of the U. S. (See 18 C.F.R. §§ 41.10-41.12 for specific qualifications.)

        Schedules
        Pages
        Comparative Balance Sheet 110-113
        Statement of Income 114-117
        Statement of Retained Earnings 118-119
        Statement of Cash Flows 120-121
        Notes to Financial Statements 122-123
    5. The following format must be used for the CPA Certification Statement unless unusual circumstances or conditions, explained in the letter or report, demand that it be varied. Insert parenthetical phrases only when exceptions are reported.

      “In connection with our regular examination of the financial statements of [COMPANY NAME] for the year ended on which we have reported separately under date of [DATE], we have also reviewed schedules [NAME OF SCHEDULES] of FERC Form No. 1 for the year filed with the Federal Energy Regulatory Commission, for conformity in all material respects with the requirements of the Federal Energy Regulatory Commission as set forth in its applicable Uniform System of Accounts and published accounting releases. Our review for this purpose included such tests of the accounting records and such other auditing procedures as we considered necessary in the circumstances.

      Based on our review, in our opinion the accompanying schedules identified in the preceding paragraph (except as noted below) conform in all material respects with the accounting requirements of the Federal Energy Regulatory Commission as set forth in its applicable Uniform System of Accounts and published accounting releases.” The letter or report must state which, if any, of the pages above do not conform to the Commission’s requirements. Describe the discrepancies that exist.
    6. Filers are encouraged to file their Annual Report to Stockholders, and the CPA Certification Statement using eFiling. Further instructions are found on the Commission’s website at https://www.ferc.gov/ferc-online/ferc-online/frequently-asked-questions-faqs-efilingferc-online.
    7. Federal, State, and Local Governments and other authorized users may obtain additional blank copies of FERC Form 1 and 3-Q free of charge from https://www.ferc.gov/general-information-0/electric-industry-forms.
  4. When to Submit

    FERC Forms 1 and 3-Q must be filed by the following schedule:

    1. FERC Form 1 for each year ending December 31 must be filed by April 18th of the following year (18 CFR § 141.1), and
    2. FERC Form 3-Q for each calendar quarter must be filed within 60 days after the reporting quarter (18 C.F.R. § 141.400).
  5. Where to Send Comments on Public Reporting Burden.

    The public reporting burden for the FERC Form 1 collection of information is estimated to average 1,168 hours per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data-needed, and completing and reviewing the collection of information. The public reporting burden for the FERC Form 3-Q collection of information is estimated to average 168 hours per response.

    Send comments regarding these burden estimates or any aspect of these collections of information, including suggestions for reducing burden, to the Federal Energy Regulatory Commission, 888 First Street NE, Washington, DC 20426 (Attention: Information Clearance Officer); and to the Office of Information and Regulatory Affairs, Office of Management and Budget, Washington, DC 20503 (Attention: Desk Officer for the Federal Energy Regulatory Commission). No person shall be subject to any penalty if any collection of information does not display a valid control number (44 U.S.C. § 3512 (a)).

GENERAL INSTRUCTIONS

  1. Prepare this report in conformity with the Uniform System of Accounts (18 CFR Part 101) (USofA). Interpret all accounting words and phrases in accordance with the USofA.
  2. Enter in whole numbers (dollars or MWH) only, except where otherwise noted. (Enter cents for averages and figures per unit where cents are important. The truncating of cents is allowed except on the four basic financial statements where rounding is required.) The amounts shown on all supporting pages must agree with the amounts entered on the statements that they support. When applying thresholds to determine significance for reporting purposes, use for balance sheet accounts the balances at the end of the current reporting period, and use for statement of income accounts the current year's year to date amounts.
  3. Complete each question fully and accurately, even if it has been answered in a previous report. Enter the word "None" where it truly and completely states the fact.
  4. For any page(s) that is not applicable to the respondent, omit the page(s) and enter "NA," "NONE," or "Not Applicable" in column (d) on the List of Schedules, pages 2 and 3.
  5. Enter the month, day, and year for all dates. Use customary abbreviations. The "Date of Report" included in the header of each page is to be completed only for resubmissions (see VII. below).
  6. Generally, except for certain schedules, all numbers, whether they are expected to be debits or credits, must be reported as positive. Numbers having a sign that is different from the expected sign must be reported by enclosing the numbers in parentheses.
  7. For any resubmissions, please explain the reason for the resubmission in a footnote to the data field.
  8. Do not make references to reports of previous periods/years or to other reports in lieu of required entries, except as specifically authorized.
  9. Wherever (schedule) pages refer to figures from a previous period/year, the figures reported must be based upon those shown by the report of the previous period/year, or an appropriate explanation given as to why the different figures were used.
  10. Schedule specific instructions are found in the applicable taxonomy and on the applicable blank rendered form.
Definitions for statistical classifications used for completing schedules for transmission system reporting are as follows:

FNS - Firm Network Transmission Service for Self. "Firm" means service that can not be interrupted for economic reasons and is intended to remain reliable even under adverse conditions. "Network Service" is Network Transmission Service as described in Order No. 888 and the Open Access Transmission Tariff. "Self" means the respondent.

FNO - Firm Network Service for Others. "Firm" means that service cannot be interrupted for economic reasons and is intended to remain reliable even under adverse conditions. "Network Service" is Network Transmission Service as described in Order No. 888 and the Open Access Transmission Tariff.

LFP - for Long-Term Firm Point-to-Point Transmission Reservations. "Long-Term" means one year or longer and” firm" means that service cannot be interrupted for economic reasons and is intended to remain reliable even under adverse conditions. "Point-to-Point Transmission Reservations" are described in Order No. 888 and the Open Access Transmission Tariff. For all transactions identified as LFP, provide in a footnote the termination date of the contract defined as the earliest date either buyer or seller can unilaterally cancel the contract.

OLF - Other Long-Term Firm Transmission Service. Report service provided under contracts which do not conform to the terms of the Open Access Transmission Tariff. "Long-Term" means one year or longer and “firm” means that service cannot be interrupted for economic reasons and is intended to remain reliable even under adverse conditions. For all transactions identified as OLF, provide in a footnote the termination date of the contract defined as the earliest date either buyer or seller can unilaterally get out of the contract.

SFP - Short-Term Firm Point-to-Point Transmission Reservations. Use this classification for all firm point-to-point transmission reservations, where the duration of each period of reservation is less than one-year.

NF - Non-Firm Transmission Service, where firm means that service cannot be interrupted for economic reasons and is intended to remain reliable even under adverse conditions.

OS - Other Transmission Service. Use this classification only for those services which can not be placed in the above-mentioned classifications, such as all other service regardless of the length of the contract and service FERC Form. Describe the type of service in a footnote for each entry.

AD - Out-of-Period Adjustments. Use this code for any accounting adjustments or "true-ups" for service provided in prior reporting periods. Provide an explanation in a footnote for each adjustment.

DEFINITIONS
  1. Commission Authorization (Comm. Auth.) -- The authorization of the Federal Energy Regulatory Commission, or any other Commission. Name the commission whose authorization was obtained and give date of the authorization.
  2. Respondent -- The person, corporation, licensee, agency, authority, or other Legal entity or instrumentality in whose behalf the report is made.

EXCERPTS FROM THE LAW

Federal Power Act, 16 U.S.C. § 791a-825r

Sec. 3. The words defined in this section shall have the following meanings for purposes of this Act, to with:

  1. ’Corporation' means any corporation, joint-stock company, partnership, association, business trust, organized group of persons, whether incorporated or not, or a receiver or receivers, trustee or trustees of any of the foregoing. It shall not include 'municipalities, as hereinafter defined;
  2. 'Person' means an individual or a corporation;
  3. 'Licensee, means any person, State, or municipality Licensed under the provisions of section 4 of this Act, and any assignee or successor in interest thereof;
  1. 'municipality means a city, county, irrigation district, drainage district, or other political subdivision or agency of a State competent under the Laws thereof to carry and the business of developing, transmitting, unitizing, or distributing power; ......
  1. "project' means. a complete unit of improvement or development, consisting of a power house, all water conduits, all dams and appurtenant works and structures (including navigation structures) which are a part of said unit, and all storage, diverting, or fore bay reservoirs directly connected therewith, the primary line or lines transmitting power there from to the point of junction with the distribution system or with the interconnected primary transmission system, all miscellaneous structures used and useful in connection with said unit or any part thereof, and all water rights, rights-of-way, ditches, dams, reservoirs, Lands, or interest in Lands the use and occupancy of which are necessary or appropriate in the maintenance and operation of such unit;

"Sec. 4. The Commission is hereby authorized and empowered
  1. 'To make investigations and to collect and record data concerning the utilization of the water 'resources of any region to be developed, the water-power industry and its relation to other industries and to interstate or foreign commerce, and concerning the location, capacity, development costs, and relation to markets of power sites; ... to the extent the Commission may deem necessary or useful for the purposes of this Act."

"Sec. 304.
  1. Every Licensee and every public utility shall file with the Commission such annual and other periodic or special* reports as the Commission may by rules and regulations or other prescribe as necessary or appropriate to assist the Commission in the proper administration of this Act. The Commission may prescribe the manner and FERC Form in which such reports shall be made, and require from such persons specific answers to all questions upon which the Commission may need information. The Commission may require that such reports shall include, among other things, full information as to assets and Liabilities, capitalization, net investment, and reduction thereof, gross receipts, interest due and paid, depreciation, and other reserves, cost of project and other facilities, cost of maintenance and operation of the project and other facilities, cost of renewals and replacement of the project works and other facilities, depreciation, generation, transmission, distribution, delivery, use, and sale of electric energy. The Commission may require any such person to make adequate provision for currently determining such costs and other facts. Such reports shall be made under oath unless the Commission otherwise specifies*.10
"Sec. 309.
  1. The Commission shall have power to perform any and all acts, and to prescribe, issue, make, and rescind such orders, rules and regulations as it may find necessary or appropriate to carry out the provisions of this Act. Among other things, such rules and regulations may define accounting, technical, and trade terms used in this Act; and may prescribe the FERC Form or FERC Forms of all statements, declarations, applications, and reports to be filed with the Commission, the information which they shall contain, and the time within which they shall be field..."

GENERAL PENALTIES

The Commission may assess up to $1 million per day per violation of its rules and regulations. See FPA § 316(a) (2005), 16 U.S.C. § 825o(a).


FERC FORM NO.
1

REPORT OF MAJOR ELECTRIC UTILITIES, LICENSEES AND OTHER
IDENTIFICATION
01 Exact Legal Name of Respondent

NorthWestern Energy Public Service Corporation
02 Year/ Period of Report


End of:
2024
/
Q4
03 Previous Name and Date of Change (If name changed during year)

/
04 Address of Principal Office at End of Period (Street, City, State, Zip Code)

3010 West 69th Street, Sioux Falls, SD 57108
05 Name of Contact Person

Evan VerWey
06 Title of Contact Person

Manager of Financial Reporting
07 Address of Contact Person (Street, City, State, Zip Code)

3010 West 69th Street, Sioux Falls, SD 57108
08 Telephone of Contact Person, Including Area Code

(605)-978-2906
09 This Report is An Original / A Resubmission

(1)
An Original

(2)
A Resubmission
10 Date of Report (Mo, Da, Yr)

12/31/2024
Annual Corporate Officer Certification
The undersigned officer certifies that:

I have examined this report and to the best of my knowledge, information, and belief all statements of fact contained in this report are correct statements of the business affairs of the respondent and the financial statements, and other financial information contained in this report, conform in all material respects to the Uniform System of Accounts.

01 Name

Jeff Berzina
02 Title

Controller
03 Signature

Jeff Berzina
04 Date Signed (Mo, Da, Yr)

02/28/2025
Title 18, U.S.C. 1001 makes it a crime for any person to knowingly and willingly to make to any Agency or Department of the United States any false, fictitious or fraudulent statements as to any matter within its jurisdiction.


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
LIST OF SCHEDULES (Electric Utility)

Enter in column (c) the terms "none," "not applicable," or "NA," as appropriate, where no information or amounts have been reported for certain pages. Omit pages where the respondents are "none," "not applicable," or "NA".

Line No.
Title of Schedule
(a)
Reference Page No.
(b)
Remarks
(c)
ScheduleIdentificationAbstract
Identification
1
ScheduleListOfSchedulesAbstract
List of Schedules
2
1
ScheduleGeneralInformationAbstract
General Information
101
2
ScheduleControlOverRespondentAbstract
Control Over Respondent
102
3
ScheduleCorporationsControlledByRespondentAbstract
Corporations Controlled by Respondent
103
Not Applicable
4
ScheduleOfficersAbstract
Officers
104
5
ScheduleDirectorsAbstract
Directors
105
6
ScheduleInformationOnFormulaRatesAbstract
Information on Formula Rates
106
7
ScheduleImportantChangesDuringTheQuarterYearAbstract
Important Changes During the Year
108
8
ScheduleComparativeBalanceSheetAbstract
Comparative Balance Sheet
110
9
ScheduleStatementOfIncomeAbstract
Statement of Income for the Year
114
10
ScheduleRetainedEarningsAbstract
Statement of Retained Earnings for the Year
118
12
ScheduleStatementOfCashFlowsAbstract
Statement of Cash Flows
120
12
ScheduleNotesToFinancialStatementsAbstract
Notes to Financial Statements
122
13
ScheduleStatementOfAccumulatedOtherComprehensiveIncomeAndHedgingActivitiesAbstract
Statement of Accum Other Comp Income, Comp Income, and Hedging Activities
122a
14
ScheduleSummaryOfUtilityPlantAndAccumulatedProvisionsForDepreciationAmortizationAndDepletionAbstract
Summary of Utility Plant & Accumulated Provisions for Dep, Amort & Dep
200
15
ScheduleNuclearFuelMaterialsAbstract
Nuclear Fuel Materials
202
Not Applicable
16
ScheduleElectricPlantInServiceAbstract
Electric Plant in Service
204
17
ScheduleElectricPropertyLeasedToOthersAbstract
Electric Plant Leased to Others
213
Not Applicable
18
ScheduleElectricPlantHeldForFutureUseAbstract
Electric Plant Held for Future Use
214
Not Applicable
19
ScheduleConstructionWorkInProgressElectricAbstract
Construction Work in Progress-Electric
216
20
ScheduleAccumulatedProvisionForDepreciationOfElectricUtilityPlantAbstract
Accumulated Provision for Depreciation of Electric Utility Plant
219
21
ScheduleInvestmentsInSubsidiaryCompaniesAbstract
Investment of Subsidiary Companies
224
Not Applicable
22
ScheduleMaterialsAndSuppliesAbstract
Materials and Supplies
227
23
ScheduleAllowanceInventoryAbstract
Allowances
228
Not Applicable
24
ScheduleExtraordinaryPropertyLossesAbstract
Extraordinary Property Losses
230a
Not Applicable
25
ScheduleUnrecoveredPlantAndRegulatoryStudyCostsAbstract
Unrecovered Plant and Regulatory Study Costs
230b
Not Applicable
26
ScheduleTransmissionServiceAndGenerationInterconnectionStudyCostsAbstract
Transmission Service and Generation Interconnection Study Costs
231
27
ScheduleOtherRegulatoryAssetsAbstract
Other Regulatory Assets
232
28
ScheduleMiscellaneousDeferredDebitsAbstract
Miscellaneous Deferred Debits
233
29
ScheduleAccumulatedDeferredIncomeTaxesAbstract
Accumulated Deferred Income Taxes
234
30
ScheduleCapitalStockAbstract
Capital Stock
250
31
ScheduleOtherPaidInCapitalAbstract
Other Paid-in Capital
253
32
ScheduleCapitalStockExpenseAbstract
Capital Stock Expense
254b
Not Applicable
33
ScheduleLongTermDebtAbstract
Long-Term Debt
256
34
ScheduleReconciliationOfReportedNetIncomeWithTaxableIncomeForFederalIncomeTaxesAbstract
Reconciliation of Reported Net Income with Taxable Inc for Fed Inc Tax
261
35
ScheduleTaxesAccruedPrepaidAndChargedDuringYearDistributionOfTaxesChargedAbstract
Taxes Accrued, Prepaid and Charged During the Year
262
36
ScheduleAccumulatedDeferredInvestmentTaxCreditsAbstract
Accumulated Deferred Investment Tax Credits
266
Not Applicable
37
ScheduleOtherDeferredCreditsAbstract
Other Deferred Credits
269
38
ScheduleAccumulatedDeferredIncomeTaxesAcceleratedAmortizationPropertyAbstract
Accumulated Deferred Income Taxes-Accelerated Amortization Property
272
Not Applicable
39
ScheduleAccumulatedDeferredIncomeTaxesOtherPropertyAbstract
Accumulated Deferred Income Taxes-Other Property
274
40
ScheduleAccumulatedDeferredIncomeTaxesOtherAbstract
Accumulated Deferred Income Taxes-Other
276
41
ScheduleOtherRegulatoryLiabilitiesAbstract
Other Regulatory Liabilities
278
42
ScheduleElectricOperatingRevenuesAbstract
Electric Operating Revenues
300
43
ScheduleRegionalTransmissionServiceRevenuesAbstract
Regional Transmission Service Revenues (Account 457.1)
302
Not Applicable
44
ScheduleSalesOfElectricityByRateSchedulesAbstract
Sales of Electricity by Rate Schedules
304
45
ScheduleSalesForResaleAbstract
Sales for Resale
310
Not Applicable
46
ScheduleElectricOperationsAndMaintenanceExpensesAbstract
Electric Operation and Maintenance Expenses
320
47
SchedulePurchasedPowerAbstract
Purchased Power
326
48
ScheduleTransmissionOfElectricityForOthersAbstract
Transmission of Electricity for Others
328
49
ScheduleTransmissionOfElectricityByIsoOrRtoAbstract
Transmission of Electricity by ISO/RTOs
331
Not Applicable
50
ScheduleTransmissionOfElectricityByOthersAbstract
Transmission of Electricity by Others
332
51
ScheduleMiscellaneousGeneralExpensesAbstract
Miscellaneous General Expenses-Electric
335
52
ScheduleDepreciationDepletionAndAmortizationAbstract
Depreciation and Amortization of Electric Plant (Account 403, 404, 405)
336
53
ScheduleRegulatoryCommissionExpensesAbstract
Regulatory Commission Expenses
350
54
ScheduleResearchDevelopmentOrDemonstrationExpendituresAbstract
Research, Development and Demonstration Activities
352
Not Applicable
55
ScheduleDistributionOfSalariesAndWagesAbstract
Distribution of Salaries and Wages
354
56
ScheduleCommonUtilityPlantAndExpensesAbstract
Common Utility Plant and Expenses
356
57
ScheduleAmountsIncludedInIsoOrRtoSettlementAbstract
Amounts included in ISO/RTO Settlement Statements
397
58
SchedulePurchasesSalesOfAncillaryServicesAbstract
Purchase and Sale of Ancillary Services
398
Not Applicable
59
ScheduleMonthlyTransmissionSystemPeakLoadAbstract
Monthly Transmission System Peak Load
400
Not Applicable
60
ScheduleMonthlyIsoOrRtoTransmissionSystemPeakLoadAbstract
Monthly ISO/RTO Transmission System Peak Load
400a
61
ScheduleElectricEnergyAccountAbstract
Electric Energy Account
401a
62
ScheduleMonthlyPeakAndOutputAbstract
Monthly Peaks and Output
401b
63
ScheduleSteamElectricGeneratingPlantStatisticsAbstract
Steam Electric Generating Plant Statistics
402
64
ScheduleHydroelectricGeneratingPlantStatisticsAbstract
Hydroelectric Generating Plant Statistics
406
Not Applicable
65
SchedulePumpedStorageGeneratingPlantStatisticsAbstract
Pumped Storage Generating Plant Statistics
408
Not Applicable
66
ScheduleGeneratingPlantStatisticsAbstract
Generating Plant Statistics Pages
410
66.1
ScheduleEnergyStorageOperationsLargePlantsAbstract
Energy Storage Operations (Large Plants)
414
66.2
ScheduleEnergyStorageOperationsSmallPlantsAbstract
Energy Storage Operations (Small Plants)
419
67
ScheduleTransmissionLineStatisticsAbstract
Transmission Line Statistics Pages
422
68
ScheduleTransmissionLinesAddedAbstract
Transmission Lines Added During Year
424
None
69
ScheduleSubstationsAbstract
Substations
426
70
ScheduleTransactionsWithAssociatedAffiliatedCompaniesAbstract
Transactions with Associated (Affiliated) Companies
429
71
FootnoteDataAbstract
Footnote Data
450
StockholdersReportsAbstract
Stockholders' Reports (check appropriate box)
Stockholders' Reports Check appropriate box:

Two copies will be submitted

No annual report to stockholders is prepared


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
GENERAL INFORMATION
1. Provide name and title of officer having custody of the general corporate books of account and address of office where the general corporate books are kept, and address of office where any other corporate books of account are kept, if different from that where the general corporate books are kept.

Jeff B. Berzina

Controller

3010 West 69th Street, Sioux Falls, SD 57108
2. Provide the name of the State under the laws of which respondent is incorporated, and date of incorporation. If incorporated under a special law, give reference to such law. If not incorporated, state that fact and give the type of organization and the date organized.

State of Incorporation:
SD

Date of Incorporation:
2023-05-30

Incorporated Under Special Law:

3. If at any time during the year the property of respondent was held by a receiver or trustee, give (a) name of receiver or trustee, (b) date such receiver or trustee took possession, (c) the authority by which the receivership or trusteeship was created, and (d) date when possession by receiver or trustee ceased.

(a) Name of Receiver or Trustee Holding Property of the Respondent:

(b) Date Receiver took Possession of Respondent Property:

(c) Authority by which the Receivership or Trusteeship was created:

(d) Date when possession by receiver or trustee ceased:
4. State the classes or utility and other services furnished by respondent during the year in each State in which the respondent operated.

Electric and Natural Gas Utility in South Dakota; Natural Gas Utility in Nebraska.
5. Have you engaged as the principal accountant to audit your financial statements an accountant who is not the principal accountant for your previous year's certified financial statements?
(1)
Yes

(2)
No


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
CONTROL OVER RESPONDENT
1. If any corporation, business trust, or similar organization or a combination of such organizations jointly held control over the respondent at the end of the year, state name of controlling corporation or organization, manner in which control was held, and extent of control. If control was in a holding company organization, show the chain of ownership or control to the main parent company or organization. If control was held by a trustee(s), state name of trustee(s), name of beneficiary or beneficiaries for whom trust was maintained, and purpose of the trust.

Respondent is a wholly-owned, direct subsidiary of NorthWestern Energy Group, Inc. At December 31, 2024, NorthWestern Energy Group, Inc. owned 100% of the common stock of Respondent.


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
CORPORATIONS CONTROLLED BY RESPONDENT
  1. Report below the names of all corporations, business trusts, and similar organizations, controlled directly or indirectly by respondent at any time during the year. If control ceased prior to end of year, give particulars (details) in a footnote.
  2. If control was by other means than a direct holding of voting rights, state in a footnote the manner in which control was held, naming any intermediaries involved.
  3. If control was held jointly with one or more other interests, state the fact in a footnote and name the other interests.
Definitions
  1. See the Uniform System of Accounts for a definition of control.
  2. Direct control is that which is exercised without interposition of an intermediary.
  3. Indirect control is that which is exercised by the interposition of an intermediary which exercises direct control.
  4. Joint control is that in which neither interest can effectively control or direct action without the consent of the other, as where the voting control is equally divided between two holders, or each party holds a veto power over the other. Joint control may exist by mutual agreement or understanding between two or more parties who together have control within the meaning of the definition of control in the Uniform System of Accounts, regardless of the relative voting rights of each party.
Line No.
NameOfCompanyControlledByRespondent
Name of Company Controlled
(a)
CompanyControlledByRespondentKindOfBusinessDescription
Kind of Business
(b)
VotingStockOwnedByRespondentPercentage
Percent Voting Stock Owned
(c)
FootnoteReferences
Footnote Ref.
(d)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
OFFICERS
  1. Report below the name, title and salary for each executive officer whose salary is $50,000 or more. An "executive officer" of a respondent includes its president, secretary, treasurer, and vice president in charge of a principal business unit, division or function (such as sales, administration or finance), and any other person who performs similar policy making functions.
  2. If a change was made during the year in the incumbent of any position, show name and total remuneration of the previous incumbent, and the date the change in incumbency was made.
Line No.
OfficerTitle
Title
(a)
OfficerName
Name of Officer
(b)
OfficerSalary
Salary for Year
(c)
DateOfficerIncumbencyStarted
Date Started in Period
(d)
DateOfficerIncumbencyEnded
Date Ended in Period
(e)
1
President and Chief Executive Officer
Brian Bird
873,077
2
Vice President, Chief Financial Officer
Crystal Lail
493,101
3
Vice President, General Counsel and Federal Government Affairs
Shannon Heim
364,615
4
Vice President, Asset Management & Business Development
Bleau Lafave
264,620
5
Vice President, Customer Care, Communications, and Human Resources
Bobbi Schroeppel
344,347
6
Vice President, Regulatory Affairs
Cyndee Fang
177,077
2024-09-03
7
Vice President, Distribution
Jason Merkel
273,656
8
Vice President, Technology
Jeanne Vold
277,409
9
Vice President, Supply and Montana Government Affairs
John Hines
341,065
10
Vice President, Transmission
Michael Cashell
340,729


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
DIRECTORS
  1. Report below the information called for concerning each director of the respondent who held office at any time during the year. Include in column (a), name and abbreviated titles of the directors who are officers of the respondent.
  2. Provide the principle place of business in column (b), designate members of the Executive Committee in column (c), and the Chairman of the Executive Committee in column (d).
Line No.
NameAndTitleOfDirector
Name (and Title) of Director
(a)
PrincipalBusinessAddress
Principal Business Address
(b)
MemberOfTheExecutiveCommittee
Member of the Executive Committee
(c)
ChairmanOfTheExecutiveCommittee
Chairman of the Executive Committee
(d)
1
Brian Bird (President and Chief Executive Officer)
Sioux Falls, South Dakota
false
false
2
Crystal Lail (Vice President, Chief Financial Officer)
Sioux Falls, South Dakota
false
false
3
Shannon Heim (Vice President, General Counsel and Federal Government Affairs)
Sioux Falls, South Dakota
false
false
4
Bleau Lafave (Vice President, Asset Management & Business Development)
Sioux Falls, South Dakota
false
false
5
Bobbi Schroeppel (Vice President, Customer Care, Communications, and Human Resources)
Sioux Falls, South Dakota
false
false
6
Cyndee Fang (Vice President, Regulatory Affairs)
Sioux Falls, South Dakota
false
false
7
Jason Merkel (Vice President, Distribution)
Sioux Falls, South Dakota
false
false
8
Jeanne Vold (Vice President, Technology)
Sioux Falls, South Dakota
false
false
9
John Hines (Vice President, Supply and Montana Government Affairs)
Sioux Falls, South Dakota
false
false
10
Michael Cashell (Vice President, Transmission)
Sioux Falls, South Dakota
false
false


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
INFORMATION ON FORMULA RATES
Does the respondent have formula rates?
Yes

No
  1. Please list the Commission accepted formula rates including FERC Rate Schedule or Tariff Number and FERC proceeding (i.e. Docket No) accepting the rate(s) or changes in the accepted rate.
Line No.
RateScheduleTariffNumber
FERC Rate Schedule or Tariff Number
(a)
ProceedingDocketNumber
FERC Proceeding
(b)
1
Addendum 27 to Attachment H of Southwest Power Pool Open Access Transmission Tariff
ER24-2186-000


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
INFORMATION ON FORMULA RATES - FERC Rate Schedule/Tariff Number FERC Proceeding
Does the respondent file with the Commission annual (or more frequent) filings containing the inputs to the formula rate(s)?
Yes

No
  1. If yes, provide a listing of such filings as contained on the Commission's eLibrary website.
Line No.
AccessionNumber
Accession No.
(a)
DocumentDate
Document Date / Filed Date
(b)
DocketNumber
Docket No.
(c)
DescriptionOfFiling
Description
(d)
RateScheduleTariffNumber
Formula Rate FERC Rate Schedule Number or Tariff Number
(e)
1
12/09/2024
ER25-678-000
Annual Informational Attachment H Filing of NorthWestern Energy Public Service Corporation (Rate Year 2024)
Addendum 27 to Attachment H of Southwest Power Pool Open Access Transmission Tariff


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
INFORMATION ON FORMULA RATES - Formula Rate Variances
  1. If a respondent does not submit such filings then indicate in a footnote to the applicable Form 1 schedule where formula rate inputs differ from amounts reported in the Form 1.
  2. The footnote should provide a narrative description explaining how the "rate" (or billing) was derived if different from the reported amount in the Form 1.
  3. The footnote should explain amounts excluded from the ratebase or where labor or other allocation factors, operating expenses, or other items impacting formula rate inputs differ from amounts reported in Form 1 schedule amounts.
  4. Where the Commission has provided guidance on formula rate inputs, the specific proceeding should be noted in the footnote.
Line No.
PageNumberOfFormulaRateVariances
Page No(s).
(a)
ScheduleOfFormulaRateVariances
Schedule
(b)
ColumnOfFormulaRateVariances
Column
(c)
LineNumberOfFormulaRateVariances
Line No.
(d)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
IMPORTANT CHANGES DURING THE QUARTER/YEAR

Give particulars (details) concerning the matters indicated below. Make the statements explicit and precise, and number them in accordance with the inquiries. Each inquiry should be answered. Enter "none," "not applicable," or "NA" where applicable. If information which answers an inquiry is given elsewhere in the report, make a reference to the schedule in which it appears.

  1. Changes in and important additions to franchise rights: Describe the actual consideration given therefore and state from whom the franchise rights were acquired. If acquired without the payment of consideration, state that fact.
  2. Acquisition of ownership in other companies by reorganization, merger, or consolidation with other companies: Give names of companies involved, particulars concerning the transactions, name of the Commission authorizing the transaction, and reference to Commission authorization.
  3. Purchase or sale of an operating unit or system: Give a brief description of the property, and of the transactions relating thereto, and reference to Commission authorization, if any was required. Give date journal entries called for by the Uniform System of Accounts were submitted to the Commission.
  4. Important leaseholds (other than leaseholds for natural gas lands) that have been acquired or given, assigned or surrendered: Give effective dates, lengths of terms, names of parties, rents, and other condition. State name of Commission authorizing lease and give reference to such authorization.
  5. Important extension or reduction of transmission or distribution system: State territory added or relinquished and date operations began or ceased and give reference to Commission authorization, if any was required. State also the approximate number of customers added or lost and approximate annual revenues of each class of service. Each natural gas company must also state major new continuing sources of gas made available to it from purchases, development, purchase contract or otherwise, giving location and approximate total gas volumes available, period of contracts, and other parties to any such arrangements, etc.
  6. Obligations incurred as a result of issuance of securities or assumption of liabilities or guarantees including issuance of short-term debt and commercial paper having a maturity of one year or less. Give reference to FERC or State Commission authorization, as appropriate, and the amount of obligation or guarantee.
  7. Changes in articles of incorporation or amendments to charter: Explain the nature and purpose of such changes or amendments.
  8. State the estimated annual effect and nature of any important wage scale changes during the year.
  9. State briefly the status of any materially important legal proceedings pending at the end of the year, and the results of any such proceedings culminated during the year.
  10. Describe briefly any materially important transactions of the respondent not disclosed elsewhere in this report in which an officer, director, security holder reported on Pages 104 or 105 of the Annual Report Form No. 1, voting trustee, associated company or known associate of any of these persons was a party or in which any such person had a material interest.
  11. (Reserved.)
  12. If the important changes during the year relating to the respondent company appearing in the annual report to stockholders are applicable in every respect and furnish the data required by Instructions 1 to 11 above, such notes may be included on this page.
  13. Describe fully any changes in officers, directors, major security holders and voting powers of the respondent that may have occurred during the reporting period.
  14. In the event that the respondent participates in a cash management program(s) and its proprietary capital ratio is less than 30 percent please describe the significant events or transactions causing the proprietary capital ratio to be less than 30 percent, and the extent to which the respondent has amounts loaned or money advanced to its parent, subsidiary, or affiliated companies through a cash management program(s). Additionally, please describe plans, if any to regain at least a 30 percent proprietary ratio.

1) On January 1, 2024, the franchise rights for the SD/NE operations of NorthWestern Corporation were transferred to NorthWestern Energy Public Service Corporation. This had no impact on the franchise rights. See item #2 below for further information.

2) On June 1, 2022, we filed a legal corporate restructuring application (Restructuring Plan) with the state commissions in Montana, South Dakota, and Nebraska and the Federal Energy Regulatory Commission. We received all necessary regulatory approvals to effectuate this Restructuring Plan.

 

On January 1, 2024, we completed the second and final phase of the holding company reorganization. NorthWestern Corporation contributed the assets and liabilities of its South Dakota and Nebraska regulated utilities to NorthWestern Energy Public Service Corporation, and then distributed its equity interest in NorthWestern Energy Public Service Corporation and certain other subsidiaries to NorthWestern Energy Group, Inc., resulting in NorthWestern Corporation owning and operating the Montana regulated utility and NorthWestern Energy Public Service Corporation owning and operating the Nebraska and South Dakota utilities, each as a direct subsidiary of NorthWestern Energy Group, Inc. 

3) None

4) None.

5) None.

6) See Note 10 Unsecured Credit Faciltiies." Debt Issuance: Approval by the SDPUC docket GE-002, approval by the NPUC Application NG-121.

 

 

 

7) None.

8) None.

9) See Note 17 "Commitments and Contingencies."

10) None.

12) None.

13) On September 3rd, 2024, Cyndee Fang, Vice President of Regulatory Affiars, left the Company.

14) N/A.


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
COMPARATIVE BALANCE SHEET (ASSETS AND OTHER DEBITS)
Line No.
Title of Account
(a)
Ref. Page No.
(b)
Current Year End of Quarter/Year Balance
(c)
Prior Year End Balance 12/31
(d)
1
UtilityPlantAbstract
UTILITY PLANT
2
UtilityPlant
Utility Plant (101-106, 114)
200
1,535,632,024
3
ConstructionWorkInProgress
Construction Work in Progress (107)
200
30,637,674
4
UtilityPlantAndConstructionWorkInProgress
TOTAL Utility Plant (Enter Total of lines 2 and 3)
1,566,269,698
5
AccumulatedProvisionForDepreciationAmortizationAndDepletionOfPlantUtility
(Less) Accum. Prov. for Depr. Amort. Depl. (108, 110, 111, 115)
200
565,615,458
6
UtilityPlantNet
Net Utility Plant (Enter Total of line 4 less 5)
1,000,654,240
7
NuclearFuelInProcessOfRefinementConversionEnrichmentAndFabrication
Nuclear Fuel in Process of Ref., Conv., Enrich., and Fab. (120.1)
202
8
NuclearFuelMaterialsAndAssembliesStockAccountMajorOnly
Nuclear Fuel Materials and Assemblies-Stock Account (120.2)
9
NuclearFuelAssembliesInReactorMajorOnly
Nuclear Fuel Assemblies in Reactor (120.3)
10
SpentNuclearFuelMajorOnly
Spent Nuclear Fuel (120.4)
11
NuclearFuelUnderCapitalLeases
Nuclear Fuel Under Capital Leases (120.6)
12
AccumulatedProvisionForAmortizationOfNuclearFuelAssemblies
(Less) Accum. Prov. for Amort. of Nucl. Fuel Assemblies (120.5)
202
13
NuclearFuelNet
Net Nuclear Fuel (Enter Total of lines 7-11 less 12)
14
UtilityPlantAndNuclearFuelNet
Net Utility Plant (Enter Total of lines 6 and 13)
1,000,654,240
15
OtherElectricPlantAdjustments
Utility Plant Adjustments (116)
93,779,293
16
GasStoredUndergroundNoncurrent
Gas Stored Underground - Noncurrent (117)
17
OtherPropertyAndInvestmentsAbstract
OTHER PROPERTY AND INVESTMENTS
18
NonutilityProperty
Nonutility Property (121)
19
AccumulatedProvisionForDepreciationAndAmortizationOfNonutilityProperty
(Less) Accum. Prov. for Depr. and Amort. (122)
20
InvestmentInAssociatedCompanies
Investments in Associated Companies (123)
21
InvestmentInSubsidiaryCompanies
Investment in Subsidiary Companies (123.1)
224
23
NoncurrentPortionOfAllowances
Noncurrent Portion of Allowances
228
24
OtherInvestments
Other Investments (124)
521,000
25
SinkingFunds
Sinking Funds (125)
26
DepreciationFund
Depreciation Fund (126)
27
AmortizationFundFederal
Amortization Fund - Federal (127)
28
OtherSpecialFunds
Other Special Funds (128)
29
SpecialFunds
Special Funds (Non Major Only) (129)
30
DerivativeInstrumentAssetsLongTerm
Long-Term Portion of Derivative Assets (175)
31
DerivativeInstrumentAssetsHedgesLongTerm
Long-Term Portion of Derivative Assets - Hedges (176)
32
OtherPropertyAndInvestments
TOTAL Other Property and Investments (Lines 18-21 and 23-31)
521,000
33
CurrentAndAccruedAssetsAbstract
CURRENT AND ACCRUED ASSETS
34
CashAndWorkingFunds
Cash and Working Funds (Non-major Only) (130)
35
Cash
Cash (131)
1,559,709
1
36
SpecialDeposits
Special Deposits (132-134)
9,691,457
37
WorkingFunds
Working Fund (135)
5,250
38
TemporaryCashInvestments
Temporary Cash Investments (136)
39
NotesReceivable
Notes Receivable (141)
40
CustomerAccountsReceivable
Customer Accounts Receivable (142)
16,219,387
41
OtherAccountsReceivable
Other Accounts Receivable (143)
730,883
42
AccumulatedProvisionForUncollectibleAccountsCredit
(Less) Accum. Prov. for Uncollectible Acct.-Credit (144)
322,761
43
NotesReceivableFromAssociatedCompanies
Notes Receivable from Associated Companies (145)
44
AccountsReceivableFromAssociatedCompanies
Accounts Receivable from Assoc. Companies (146)
350,557
45
FuelStock
Fuel Stock (151)
227
7,701,524
46
FuelStockExpensesUndistributed
Fuel Stock Expenses Undistributed (152)
227
47
Residuals
Residuals (Elec) and Extracted Products (153)
227
48
PlantMaterialsAndOperatingSupplies
Plant Materials and Operating Supplies (154)
227
23,261,515
49
Merchandise
Merchandise (155)
227
50
OtherMaterialsAndSupplies
Other Materials and Supplies (156)
227
51
NuclearMaterialsHeldForSale
Nuclear Materials Held for Sale (157)
202/227
52
AllowanceInventoryAndWithheld
Allowances (158.1 and 158.2)
228
53
NoncurrentPortionOfAllowances
(Less) Noncurrent Portion of Allowances
228
54
StoresExpenseUndistributed
Stores Expense Undistributed (163)
227
55
GasStoredCurrent
Gas Stored Underground - Current (164.1)
2,471,128
56
LiquefiedNaturalGasStoredAndHeldForProcessing
Liquefied Natural Gas Stored and Held for Processing (164.2-164.3)
57
Prepayments
Prepayments (165)
(a)
11,629,819
58
AdvancesForGas
Advances for Gas (166-167)
59
InterestAndDividendsReceivable
Interest and Dividends Receivable (171)
60
RentsReceivable
Rents Receivable (172)
6,162
61
AccruedUtilityRevenues
Accrued Utility Revenues (173)
21,060,198
62
MiscellaneousCurrentAndAccruedAssets
Miscellaneous Current and Accrued Assets (174)
1,553
63
DerivativeInstrumentAssets
Derivative Instrument Assets (175)
64
DerivativeInstrumentAssetsLongTerm
(Less) Long-Term Portion of Derivative Instrument Assets (175)
65
DerivativeInstrumentAssetsHedges
Derivative Instrument Assets - Hedges (176)
66
DerivativeInstrumentAssetsHedgesLongTerm
(Less) Long-Term Portion of Derivative Instrument Assets - Hedges (176)
67
CurrentAndAccruedAssets
Total Current and Accrued Assets (Lines 34 through 66)
94,366,381
68
DeferredDebitsAbstract
DEFERRED DEBITS
69
UnamortizedDebtExpense
Unamortized Debt Expenses (181)
(b)
1,514,884
70
ExtraordinaryPropertyLosses
Extraordinary Property Losses (182.1)
230a
71
UnrecoveredPlantAndRegulatoryStudyCosts
Unrecovered Plant and Regulatory Study Costs (182.2)
230b
72
OtherRegulatoryAssets
Other Regulatory Assets (182.3)
232
99,031,157
0
73
PreliminarySurveyAndInvestigationCharges
Prelim. Survey and Investigation Charges (Electric) (183)
458,462
74
PreliminaryNaturalGasSurveyAndInvestigationChargesAndOtherPreliminarySurveyAndInvestigationCharges
Preliminary Natural Gas Survey and Investigation Charges 183.1)
75
OtherPreliminarySurveyAndInvestigationCharges
Other Preliminary Survey and Investigation Charges (183.2)
76
ClearingAccounts
Clearing Accounts (184)
77
TemporaryFacilities
Temporary Facilities (185)
78
MiscellaneousDeferredDebits
Miscellaneous Deferred Debits (186)
233
9,766,918
0
79
DeferredLossesFromDispositionOfUtilityPlant
Def. Losses from Disposition of Utility Plt. (187)
80
ResearchDevelopmentAndDemonstrationExpenditures
Research, Devel. and Demonstration Expend. (188)
352
81
UnamortizedLossOnReacquiredDebt
Unamortized Loss on Reaquired Debt (189)
(c)
793,326
82
AccumulatedDeferredIncomeTaxes
Accumulated Deferred Income Taxes (190)
234
100,962,578
0
83
UnrecoveredPurchasedGasCosts
Unrecovered Purchased Gas Costs (191)
8,908,673
84
DeferredDebits
Total Deferred Debits (lines 69 through 83)
221,435,998
85
AssetsAndOtherDebits
TOTAL ASSETS (lines 14-16, 32, 67, and 84)
1,410,756,912
1


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: Prepayments

South Dakota Operations Prepayments (165) are $10,510,220 for 2023.

(b) Concept: UnamortizedDebtExpense

Unamortized Debt Expense (Acct 181) balance for 2023 - $1,479,371

(c) Concept: UnamortizedLossOnReacquiredDebt

Unamortized Loss on Reacquired Debt (Acct 189) Balance for 2023 - 1,488,228


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
COMPARATIVE BALANCE SHEET (LIABILITIES AND OTHER CREDITS)
Line No.
Title of Account
(a)
Ref. Page No.
(b)
Current Year End of Quarter/Year Balance
(c)
Prior Year End Balance 12/31
(d)
1
ProprietaryCapitalAbstract
PROPRIETARY CAPITAL
2
CommonStockIssued
Common Stock Issued (201)
250
1
1
3
PreferredStockIssued
Preferred Stock Issued (204)
250
4
CapitalStockSubscribed
Capital Stock Subscribed (202, 205)
5
StockLiabilityForConversion
Stock Liability for Conversion (203, 206)
6
PremiumOnCapitalStock
Premium on Capital Stock (207)
7
OtherPaidInCapital
Other Paid-In Capital (208-211)
253
580,991,640
8
InstallmentsReceivedOnCapitalStock
Installments Received on Capital Stock (212)
252
9
DiscountOnCapitalStock
(Less) Discount on Capital Stock (213)
254
10
CapitalStockExpense
(Less) Capital Stock Expense (214)
254b
11
RetainedEarnings
Retained Earnings (215, 215.1, 216)
118
10,186,442
0
12
UnappropriatedUndistributedSubsidiaryEarnings
Unappropriated Undistributed Subsidiary Earnings (216.1)
118
13
ReacquiredCapitalStock
(Less) Reacquired Capital Stock (217)
250
14
NoncorporateProprietorship
Noncorporate Proprietorship (Non-major only) (218)
15
AccumulatedOtherComprehensiveIncome
Accumulated Other Comprehensive Income (219)
122(a)(b)
(a)
829,241
16
ProprietaryCapital
Total Proprietary Capital (lines 2 through 15)
(b)
592,007,324
17
LongTermDebtAbstract
LONG-TERM DEBT
18
Bonds
Bonds (221)
256
(c)
520,000,000
19
ReacquiredBonds
(Less) Reacquired Bonds (222)
256
20
AdvancesFromAssociatedCompanies
Advances from Associated Companies (223)
256
21
OtherLongTermDebt
Other Long-Term Debt (224)
256
(d)
34,000,000
22
UnamortizedPremiumOnLongTermDebt
Unamortized Premium on Long-Term Debt (225)
23
UnamortizedDiscountOnLongTermDebtDebit
(Less) Unamortized Discount on Long-Term Debt-Debit (226)
24
LongTermDebt
Total Long-Term Debt (lines 18 through 23)
554,000,000
25
OtherNoncurrentLiabilitiesAbstract
OTHER NONCURRENT LIABILITIES
26
ObligationsUnderCapitalLeaseNoncurrent
Obligations Under Capital Leases - Noncurrent (227)
77,964
27
AccumulatedProvisionForPropertyInsurance
Accumulated Provision for Property Insurance (228.1)
28
AccumulatedProvisionForInjuriesAndDamages
Accumulated Provision for Injuries and Damages (228.2)
(e)
377,500
29
AccumulatedProvisionForPensionsAndBenefits
Accumulated Provision for Pensions and Benefits (228.3)
1,587,400
30
AccumulatedMiscellaneousOperatingProvisions
Accumulated Miscellaneous Operating Provisions (228.4)
13,649,142
31
AccumulatedProvisionForRateRefunds
Accumulated Provision for Rate Refunds (229)
32
LongTermPortionOfDerivativeInstrumentLiabilities
Long-Term Portion of Derivative Instrument Liabilities
33
LongTermPortionOfDerivativeInstrumentLiabilitiesHedges
Long-Term Portion of Derivative Instrument Liabilities - Hedges
34
AssetRetirementObligations
Asset Retirement Obligations (230)
6,840,507
35
OtherNoncurrentLiabilities
Total Other Noncurrent Liabilities (lines 26 through 34)
22,532,513
36
CurrentAndAccruedLiabilitiesAbstract
CURRENT AND ACCRUED LIABILITIES
37
NotesPayable
Notes Payable (231)
38
AccountsPayable
Accounts Payable (232)
28,859,817
39
NotesPayableToAssociatedCompanies
Notes Payable to Associated Companies (233)
40
AccountsPayableToAssociatedCompanies
Accounts Payable to Associated Companies (234)
1,782,019
41
CustomerDeposits
Customer Deposits (235)
924,374
42
TaxesAccrued
Taxes Accrued (236)
262
7,808,262
0
43
InterestAccrued
Interest Accrued (237)
4,101,896
44
DividendsDeclared
Dividends Declared (238)
45
MaturedLongTermDebt
Matured Long-Term Debt (239)
46
MaturedInterest
Matured Interest (240)
47
TaxCollectionsPayable
Tax Collections Payable (241)
1,624,694
48
MiscellaneousCurrentAndAccruedLiabilities
Miscellaneous Current and Accrued Liabilities (242)
22,361,848
49
ObligationsUnderCapitalLeasesCurrent
Obligations Under Capital Leases-Current (243)
113,479
50
DerivativesInstrumentLiabilities
Derivative Instrument Liabilities (244)
51
LongTermPortionOfDerivativeInstrumentLiabilities
(Less) Long-Term Portion of Derivative Instrument Liabilities
52
DerivativeInstrumentLiabilitiesHedges
Derivative Instrument Liabilities - Hedges (245)
53
LongTermPortionOfDerivativeInstrumentLiabilitiesHedges
(Less) Long-Term Portion of Derivative Instrument Liabilities-Hedges
54
CurrentAndAccruedLiabilities
Total Current and Accrued Liabilities (lines 37 through 53)
67,576,389
55
DeferredCreditsAbstract
DEFERRED CREDITS
56
CustomerAdvancesForConstruction
Customer Advances for Construction (252)
57
AccumulatedDeferredInvestmentTaxCredits
Accumulated Deferred Investment Tax Credits (255)
266
58
DeferredGainsFromDispositionOfUtilityPlant
Deferred Gains from Disposition of Utility Plant (256)
59
OtherDeferredCredits
Other Deferred Credits (253)
269
9,971,846
0
60
OtherRegulatoryLiabilities
Other Regulatory Liabilities (254)
278
33,872,400
0
61
UnamortizedGainOnReacquiredDebt
Unamortized Gain on Reacquired Debt (257)
62
AccumulatedDeferredIncomeTaxesAcceleratedAmortizationProperty
Accum. Deferred Income Taxes-Accel. Amort.(281)
272
63
AccumulatedDeferredIncomeTaxesOtherProperty
Accum. Deferred Income Taxes-Other Property (282)
114,032,986
0
64
AccumulatedDeferredIncomeTaxesOther
Accum. Deferred Income Taxes-Other (283)
16,763,454
65
DeferredCredits
Total Deferred Credits (lines 56 through 64)
174,640,686
66
LiabilitiesAndOtherCredits
TOTAL LIABILITIES AND STOCKHOLDER EQUITY (lines 16, 24, 35, 54 and 65)
1,410,756,912
1


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: AccumulatedOtherComprehensiveIncome

Accumulated Other Comprehensive Income (219)  balance for 2023 - $325,403

(b) Concept: ProprietaryCapital

Total Proprietary Capital - Amount attributable to South Dakota and Nebraska operations as of December 31, 2023 - $580,524,775.

(c) Concept: Bonds

Bonds (221) (Total Company) for 2023 - $480,000,000

(d) Concept: OtherLongTermDebt

Other Long Term Debt (224) attributable to South Dakota and Nebraska operations as of December 31, 2023 - $54,000,000.

(e) Concept: AccumulatedProvisionForInjuriesAndDamages

South Dakota Operations Provision for Injuries and Damages (228.2) are $442,867 for 2023.


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
STATEMENT OF INCOME

Quarterly

  1. Report in column (c) the current year to date balance. Column (c) equals the total of adding the data in column (g) plus the data in column (i) plus the data in column (k). Report in column (d) similar data for the previous year. This information is reported in the annual filing only.
  2. Enter in column (e) the balance for the reporting quarter and in column (f) the balance for the same three month period for the prior year.
  3. Report in column (g) the quarter to date amounts for electric utility function; in column (i) the quarter to date amounts for gas utility, and in column (k) the quarter to date amounts for other utility function for the current year quarter.
  4. Report in column (h) the quarter to date amounts for electric utility function; in column (j) the quarter to date amounts for gas utility, and in column (l) the quarter to date amounts for other utility function for the prior year quarter.
  5. If additional columns are needed, place them in a footnote.

Annual or Quarterly if applicable

  1. Do not report fourth quarter data in columns (e) and (f)
  2. Report amounts for accounts 412 and 413, Revenues and Expenses from Utility Plant Leased to Others, in another utility column in a similar manner to a utility department. Spread the amount(s) over Lines 2 thru 26 as appropriate. Include these amounts in columns (c) and (d) totals.
  3. Report amounts in account 414, Other Utility Operating Income, in the same manner as accounts 412 and 413 above.
  4. Use page 122 for important notes regarding the statement of income for any account thereof.
  5. Give concise explanations concerning unsettled rate proceedings where a contingency exists such that refunds of a material amount may need to be made to the utility's customers or which may result in material refund to the utility with respect to power or gas purchases. State for each year effected the gross revenues or costs to which the contingency relates and the tax effects together with an explanation of the major factors which affect the rights of the utility to retain such revenues or recover amounts paid with respect to power or gas purchases.
  6. Give concise explanations concerning significant amounts of any refunds made or received during the year resulting from settlement of any rate proceeding affecting revenues received or costs incurred for power or gas purchases, and a summary of the adjustments made to balance sheet, income, and expense accounts.
  7. If any notes appearing in the report to stockholders are applicable to the Statement of Income, such notes may be included at page 122.
  8. Enter on page 122 a concise explanation of only those changes in accounting methods made during the year which had an effect on net income, including the basis of allocations and apportionments from those used in the preceding year. Also, give the appropriate dollar effect of such changes.
  9. Explain in a footnote if the previous year's/quarter's figures are different from that reported in prior reports.
  10. If the columns are insufficient for reporting additional utility departments, supply the appropriate account titles report the information in a footnote to this schedule.
Line No.
Title of Account
(a)
(Ref.) Page No.
(b)
Total Current Year to Date Balance for Quarter/Year
(c)
Total Prior Year to Date Balance for Quarter/Year
(d)
Current 3 Months Ended - Quarterly Only - No 4th Quarter
(e)
Prior 3 Months Ended - Quarterly Only - No 4th Quarter
(f)
Electric Utility Current Year to Date (in dollars)
(g)
Electric Utility Previous Year to Date (in dollars)
(h)
Gas Utiity Current Year to Date (in dollars)
(i)
Gas Utility Previous Year to Date (in dollars)
(j)
Other Utility Current Year to Date (in dollars)
(k)
Other Utility Previous Year to Date (in dollars)
(l)
1
UtilityOperatingIncomeAbstract
UTILITY OPERATING INCOME
2
OperatingRevenues
Operating Revenues (400)
300
278,227,387
193,637,593
84,589,794
3
OperatingExpensesAbstract
Operating Expenses
4
OperationExpense
Operation Expenses (401)
320
160,647,438
90,784,558
69,862,880
5
MaintenanceExpense
Maintenance Expenses (402)
320
11,117,575
9,424,506
1,693,069
6
DepreciationExpense
Depreciation Expense (403)
336
47,317,787
40,210,341
7,107,446
7
DepreciationExpenseForAssetRetirementCosts
Depreciation Expense for Asset Retirement Costs (403.1)
336
0
8
AmortizationAndDepletionOfUtilityPlant
Amort. & Depl. of Utility Plant (404-405)
336
1,375,720
1,197,898
177,822
9
AmortizationOfElectricPlantAcquisitionAdjustments
Amort. of Utility Plant Acq. Adj. (406)
336
927,997
927,997
10
AmortizationOfPropertyLossesUnrecoveredPlantAndRegulatoryStudyCosts
Amort. Property Losses, Unrecov Plant and Regulatory Study Costs (407)
11
AmortizationOfConversionExpenses
Amort. of Conversion Expenses (407.2)
12
RegulatoryDebits
Regulatory Debits (407.3)
4,684,954
1,240,686
3,444,268
13
RegulatoryCredits
(Less) Regulatory Credits (407.4)
3,394,999
1,784,300
1,610,699
14
TaxesOtherThanIncomeTaxesUtilityOperatingIncome
Taxes Other Than Income Taxes (408.1)
262
8,386,671
6,093,066
2,293,605
15
IncomeTaxesOperatingIncome
Income Taxes - Federal (409.1)
262
6,412,400
5,094,327
1,318,073
16
IncomeTaxesUtilityOperatingIncomeOther
Income Taxes - Other (409.1)
262
17
ProvisionsForDeferredIncomeTaxesUtilityOperatingIncome
Provision for Deferred Income Taxes (410.1)
234, 272
(a)
59,340,195
44,110,215
15,229,980
18
ProvisionForDeferredIncomeTaxesCreditOperatingIncome
(Less) Provision for Deferred Income Taxes-Cr. (411.1)
234, 272
60,087,028
41,963,447
18,123,581
19
InvestmentTaxCreditAdjustments
Investment Tax Credit Adj. - Net (411.4)
266
20
GainsFromDispositionOfPlant
(Less) Gains from Disp. of Utility Plant (411.6)
21
LossesFromDispositionOfServiceCompanyPlant
Losses from Disp. of Utility Plant (411.7)
22
GainsFromDispositionOfAllowances
(Less) Gains from Disposition of Allowances (411.8)
23
LossesFromDispositionOfAllowances
Losses from Disposition of Allowances (411.9)
24
AccretionExpense
Accretion Expense (411.10)
25
UtilityOperatingExpenses
TOTAL Utility Operating Expenses (Enter Total of lines 4 thru 24)
223,903,910
145,147,193
78,756,717
0
27
NetUtilityOperatingIncome
Net Util Oper Inc (Enter Tot line 2 less 25)
54,323,477
48,490,400
5,833,077
0
28
OtherIncomeAndDeductionsAbstract
Other Income and Deductions
29
OtherIncomeAbstract
Other Income
30
NonutilityOperatingIncomeAbstract
Nonutilty Operating Income
31
RevenuesFromMerchandisingJobbingAndContractWork
Revenues From Merchandising, Jobbing and Contract Work (415)
32
CostsAndExpensesOfMerchandisingJobbingAndContractWork
(Less) Costs and Exp. of Merchandising, Job. & Contract Work (416)
33
RevenuesFromNonutilityOperations
Revenues From Nonutility Operations (417)
1,339
34
ExpensesOfNonutilityOperations
(Less) Expenses of Nonutility Operations (417.1)
1,428
35
NonoperatingRentalIncome
Nonoperating Rental Income (418)
36
EquityInEarningsOfSubsidiaryCompanies
Equity in Earnings of Subsidiary Companies (418.1)
119
37
InterestAndDividendIncome
Interest and Dividend Income (419)
888,538
38
AllowanceForOtherFundsUsedDuringConstruction
Allowance for Other Funds Used During Construction (419.1)
1,089,991
39
MiscellaneousNonoperatingIncome
Miscellaneous Nonoperating Income (421)
130,994
40
GainOnDispositionOfProperty
Gain on Disposition of Property (421.1)
41
OtherIncome
TOTAL Other Income (Enter Total of lines 31 thru 40)
2,109,434
42
OtherIncomeDeductionsAbstract
Other Income Deductions
43
LossOnDispositionOfProperty
Loss on Disposition of Property (421.2)
44
MiscellaneousAmortization
Miscellaneous Amortization (425)
45
Donations
Donations (426.1)
563,678
46
LifeInsurance
Life Insurance (426.2)
47
Penalties
Penalties (426.3)
444
48
ExpendituresForCertainCivicPoliticalAndRelatedActivities
Exp. for Certain Civic, Political & Related Activities (426.4)
169,708
49
OtherDeductions
Other Deductions (426.5)
122,677
50
OtherIncomeDeductions
TOTAL Other Income Deductions (Total of lines 43 thru 49)
856,507
51
TaxesApplicableToOtherIncomeAndDeductionsAbstract
Taxes Applic. to Other Income and Deductions
52
TaxesOtherThanIncomeTaxesOtherIncomeAndDeductions
Taxes Other Than Income Taxes (408.2)
262
53
IncomeTaxesFederal
Income Taxes-Federal (409.2)
262
416,808
54
IncomeTaxesOther
Income Taxes-Other (409.2)
262
55
ProvisionForDeferredIncomeTaxesOtherIncomeAndDeductions
Provision for Deferred Inc. Taxes (410.2)
234, 272
56
ProvisionForDeferredIncomeTaxesCreditOtherIncomeAndDeductions
(Less) Provision for Deferred Income Taxes-Cr. (411.2)
234, 272
57
InvestmentTaxCreditAdjustmentsNonutilityOperations
Investment Tax Credit Adj.-Net (411.5)
58
InvestmentTaxCredits
(Less) Investment Tax Credits (420)
59
TaxesOnOtherIncomeAndDeductions
TOTAL Taxes on Other Income and Deductions (Total of lines 52-58)
416,808
60
NetOtherIncomeAndDeductions
Net Other Income and Deductions (Total of lines 41, 50, 59)
836,119
61
InterestChargesAbstract
Interest Charges
62
InterestOnLongTermDebt
Interest on Long-Term Debt (427)
23,515,593
63
AmortizationOfDebtDiscountAndExpense
Amort. of Debt Disc. and Expense (428)
314,368
64
AmortizationOfLossOnReacquiredDebt
Amortization of Loss on Reaquired Debt (428.1)
694,902
65
AmortizationOfPremiumOnDebtCredit
(Less) Amort. of Premium on Debt-Credit (429)
66
AmortizationOfGainOnReacquiredDebtCredit
(Less) Amortization of Gain on Reaquired Debt-Credit (429.1)
67
InterestOnDebtToAssociatedCompanies
Interest on Debt to Assoc. Companies (430)
68
OtherInterestExpense
Other Interest Expense (431)
236,402
69
AllowanceForBorrowedFundsUsedDuringConstructionCredit
(Less) Allowance for Borrowed Funds Used During Construction-Cr. (432)
534,213
70
NetInterestCharges
Net Interest Charges (Total of lines 62 thru 69)
24,227,052
71
IncomeBeforeExtraordinaryItems
Income Before Extraordinary Items (Total of lines 27, 60 and 70)
30,932,544
72
ExtraordinaryItemsAbstract
Extraordinary Items
73
ExtraordinaryIncome
Extraordinary Income (434)
74
ExtraordinaryDeductions
(Less) Extraordinary Deductions (435)
75
NetExtraordinaryItems
Net Extraordinary Items (Total of line 73 less line 74)
76
IncomeTaxesExtraordinaryItems
Income Taxes-Federal and Other (409.3)
262
77
ExtraordinaryItemsAfterTaxes
Extraordinary Items After Taxes (line 75 less line 76)
78
NetIncomeLoss
Net Income (Total of line 71 and 77)
30,932,544


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: ProvisionsForDeferredIncomeTaxesUtilityOperatingIncome

Included in the Provision for Deferred Income Taxes, in the Statements of Income, is amortization of the excess and deficient ADIT's as follows:

         
                         

Line No.

Description (a)

 (b)

 (c)

 (d)

 (e)

 (f)

 (g)

 (h)

 (i)

 (j)

 (k)

 (l)

                         
 

FERC Method of Amortization

RSG

SL

 

ARAM/RSG

RSG

SL

 

 

SL (MT) / RSG (SD)

SL

 

 

Amortization period

Book Lives

5 Years

 

Book Lives

Book Lives

5 Years

 

 

5 years (MT) / Book Lives (SD)

5 Years

 

 

Protected/Unprotected

Protected

Unprotected

 

Protected

Unprotected

Unprotected

 

 

F/T "as-if" normalized

F/T "as-if" normalized

 

 

FERC Amorization Account

410.1

410.1

 

411.1

411.1

411.1

   

411.1

410.1

 
 

TCJA Excess ADIT Account Reduced

190

190

Subtotal

282

282

283

Subtotal

Total of 182.3

282

190

 
 

Reg Asset Acccount Impacted

182.3

182.3

182.3

254

254

254

254

and 254

254

182.3

Total

      1

 South Dakota:

                     

      2

 Electric

                  138,139

                                -

                  138,139

                (461,834)

                                -

                                -

                (461,834)

                (323,695)

                (464,844)

                                -

                (788,539)

      3

 Gas

                     (5,513)

                             (1)

                     (5,514)

                (113,526)

                  (46,234)

                                -

                (159,760)

                (165,274)

                  (75,064)

                                -

                (240,338)

      4

 Total

                  132,626

                             (1)

                  132,625

                (575,360)

                  (46,234)

                                -

                (621,594)

                (488,969)

                (539,908)

                                -

            (1,028,877)


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report


End of:
2024
/
Q4
STATEMENT OF RETAINED EARNINGS
  1. Do not report Lines 49-53 on the quarterly report.
  2. Report all changes in appropriated retained earnings, unappropriated retained earnings, and unappropriated undistributed subsidiary earnings for the year.
  3. Each credit and debit during the year should be identified as to the retained earnings account in which recorded (Accounts 433, 436-439 inclusive). Show the contra primary account affected in column (b).
  4. State the purpose and amount for each reservation or appropriation of retained earnings.
  5. List first Account 439, Adjustments to Retained Earnings, reflecting adjustments to the opening balance of retained earnings. Follow by credit, then debit items, in that order.
  6. Show dividends for each class and series of capital stock.
  7. Show separately the State and Federal income tax effect of items shown for Account 439, Adjustments to Retained Earnings.
  8. Explain in a footnote the basis for determining the amount reserved or appropriated. If such reservation or appropriation is to be recurrent, state the number and annual amounts to be reserved or appropriated as well as the totals eventually to be accumulated.
  9. If any notes appearing in the report to stockholders are applicable to this statement, attach them at page 122.
Line No.
Item
(a)
Contra Primary Account Affected
(b)
Current Quarter/Year Year to Date Balance
(c)
Previous Quarter/Year Year to Date Balance
(d)
UnappropriatedRetainedEarningsAbstract
UNAPPROPRIATED RETAINED EARNINGS (Account 216)
1
UnappropriatedRetainedEarnings
Balance-Beginning of Period
0
0
2
ChangesAbstract
Changes
3
AdjustmentsToRetainedEarningsAbstract
Adjustments to Retained Earnings (Account 439)
4
AdjustmentsToRetainedEarningsCreditAbstract
Adjustments to Retained Earnings Credit
9
AdjustmentsToRetainedEarningsCredit
TOTAL Credits to Retained Earnings (Acct. 439)
10
AdjustmentsToRetainedEarningsDebitAbstract
Adjustments to Retained Earnings Debit
15
AdjustmentsToRetainedEarningsDebit
TOTAL Debits to Retained Earnings (Acct. 439)
16
BalanceTransferredFromIncome
Balance Transferred from Income (Account 433 less Account 418.1)
30,932,544
17
AppropriationsOfRetainedEarningsAbstract
Appropriations of Retained Earnings (Acct. 436)
22
AppropriationsOfRetainedEarnings
TOTAL Appropriations of Retained Earnings (Acct. 436)
23
DividendsDeclaredPreferredStockAbstract
Dividends Declared-Preferred Stock (Account 437)
29
DividendsDeclaredPreferredStock
TOTAL Dividends Declared-Preferred Stock (Acct. 437)
30
DividendsDeclaredCommonStockAbstract
Dividends Declared-Common Stock (Account 438)
36
DividendsDeclaredCommonStock
TOTAL Dividends Declared-Common Stock (Acct. 438)
20,746,102
37
TransfersFromUnappropriatedUndistributedSubsidiaryEarnings
Transfers from Acct 216.1, Unapprop. Undistrib. Subsidiary Earnings
38
UnappropriatedRetainedEarnings
Balance - End of Period (Total 1,9,15,16,22,29,36,37)
10,186,442
0
39
AppropriatedRetainedEarningsAbstract
APPROPRIATED RETAINED EARNINGS (Account 215)
45
AppropriatedRetainedEarnings
TOTAL Appropriated Retained Earnings (Account 215)
AppropriatedRetainedEarningsAmortizationReserveFederalAbstract
APPROP. RETAINED EARNINGS - AMORT. Reserve, Federal (Account 215.1)
46
AppropriatedRetainedEarningsAmortizationReserveFederal
TOTAL Approp. Retained Earnings-Amort. Reserve, Federal (Acct. 215.1)
47
AppropriatedRetainedEarningsIncludingReserveAmortization
TOTAL Approp. Retained Earnings (Acct. 215, 215.1) (Total 45,46)
48
RetainedEarnings
TOTAL Retained Earnings (Acct. 215, 215.1, 216) (Total 38, 47) (216.1)
10,186,442
0
UnappropriatedUndistributedSubsidiaryEarningsAbstract
UNAPPROPRIATED UNDISTRIBUTED SUBSIDIARY EARNINGS (Account Report only on an Annual Basis, no Quarterly)
49
UnappropriatedUndistributedSubsidiaryEarnings
Balance-Beginning of Year (Debit or Credit)
50
EquityInEarningsOfSubsidiaryCompanies
Equity in Earnings for Year (Credit) (Account 418.1)
51
DividendsReceived
(Less) Dividends Received (Debit)
52
ChangesUnappropriatedUndistributedSubsidiaryEarningsCredits
TOTAL other Changes in unappropriated undistributed subsidiary earnings for the year
53
UnappropriatedUndistributedSubsidiaryEarnings
Balance-End of Year (Total lines 49 thru 52)


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
STATEMENT OF CASH FLOWS
  1. Codes to be used:(a) Net Proceeds or Payments;(b)Bonds, debentures and other long-term debt; (c) Include commercial paper; and (d) Identify separately such items as investments, fixed assets, intangibles, etc.
  2. Information about noncash investing and financing activities must be provided in the Notes to the Financial statements. Also provide a reconciliation between "Cash and Cash Equivalents at End of Period" with related amounts on the Balance Sheet.
  3. Operating Activities - Other: Include gains and losses pertaining to operating activities only. Gains and losses pertaining to investing and financing activities should be reported in those activities. Show in the Notes to the Financials the amounts of interest paid (net of amount capitalized) and income taxes paid.
  4. Investing Activities: Include at Other (line 31) net cash outflow to acquire other companies. Provide a reconciliation of assets acquired with liabilities assumed in the Notes to the Financial Statements. Do not include on this statement the dollar amount of leases capitalized per the USofA General Instruction 20; instead provide a reconciliation of the dollar amount of leases capitalized with the plant cost.
Line No.
Description (See Instructions No.1 for explanation of codes)
(a)
Current Year to Date Quarter/Year
(b)
Previous Year to Date Quarter/Year
(c)
1
NetCashFlowFromOperatingActivitiesAbstract
Net Cash Flow from Operating Activities
2
NetIncomeLoss
Net Income (Line 78(c) on page 117)
30,932,544
3
NoncashChargesCreditsToIncomeAbstract
Noncash Charges (Credits) to Income:
4
DepreciationAndDepletion
Depreciation and Depletion
47,317,787
5
NoncashAdjustmentsToCashFlowsFromOperatingActivities
Amortization of (Specify) (footnote details)
5.1
NoncashAdjustmentsToCashFlowsFromOperatingActivitiesDescription
Amortization of
2,303,717
5.2
NoncashAdjustmentsToCashFlowsFromOperatingActivitiesDescription
Other Non-cash charges to net income-net
(a)
1,696,594
8
DeferredIncomeTaxesNet
Deferred Income Taxes (Net)
746,833
9
InvestmentTaxCreditAdjustmentsNet
Investment Tax Credit Adjustment (Net)
10
NetIncreaseDecreaseInReceivablesOperatingActivities
Net (Increase) Decrease in Receivables
8,813,403
11
NetIncreaseDecreaseInInventoryOperatingActivities
Net (Increase) Decrease in Inventory
1,717,343
12
NetIncreaseDecreaseInAllowancesInventoryOperatingActivities
Net (Increase) Decrease in Allowances Inventory
13
NetIncreaseDecreaseInPayablesAndAccruedExpensesOperatingActivities
Net Increase (Decrease) in Payables and Accrued Expenses
3,940,641
14
NetIncreaseDecreaseInOtherRegulatoryAssetsOperatingActivities
Net (Increase) Decrease in Other Regulatory Assets
140,520
15
NetIncreaseDecreaseInOtherRegulatoryLiabilitiesOperatingActivities
Net Increase (Decrease) in Other Regulatory Liabilities
1,688,273
16
AllowanceForOtherFundsUsedDuringConstructionOperatingActivities
(Less) Allowance for Other Funds Used During Construction
1,089,991
17
UndistributedEarningsFromSubsidiaryCompaniesOperatingActivities
(Less) Undistributed Earnings from Subsidiary Companies
18
OtherAdjustmentsToCashFlowsFromOperatingActivities
Other (provide details in footnote):
18.1
OtherAdjustmentsToCashFlowsFromOperatingActivitiesDescription
Other
(b)
8,310,233
22
NetCashFlowFromOperatingActivities
Net Cash Provided by (Used in) Operating Activities (Total of Lines 2 thru 21)
81,311,492
24
CashFlowsFromInvestmentActivitiesAbstract
Cash Flows from Investment Activities:
25
ConstructionAndAcquisitionOfPlantIncludingLandAbstract
Construction and Acquisition of Plant (including land):
26
GrossAdditionsToUtilityPlantLessNuclearFuelInvestingActivities
Gross Additions to Utility Plant (less nuclear fuel)
66,429,970
27
GrossAdditionsToNuclearFuelInvestingActivities
Gross Additions to Nuclear Fuel
28
GrossAdditionsToCommonUtilityPlantInvestingActivities
Gross Additions to Common Utility Plant
3,463,777
29
GrossAdditionsToNonutilityPlantInvestingActivities
Gross Additions to Nonutility Plant
30
AllowanceForOtherFundsUsedDuringConstructionInvestingActivities
(Less) Allowance for Other Funds Used During Construction
1,089,991
31
OtherConstructionAndAcquisitionOfPlantInvestmentActivities
Other (provide details in footnote):
34
CashOutflowsForPlant
Cash Outflows for Plant (Total of lines 26 thru 33)
68,803,756
36
AcquisitionOfOtherNoncurrentAssets
Acquisition of Other Noncurrent Assets (d)
37
ProceedsFromDisposalOfNoncurrentAssets
Proceeds from Disposal of Noncurrent Assets (d)
39
InvestmentsInAndAdvancesToAssociatedAndSubsidiaryCompanies
Investments in and Advances to Assoc. and Subsidiary Companies
40
ContributionsAndAdvancesFromAssociatedAndSubsidiaryCompanies
Contributions and Advances from Assoc. and Subsidiary Companies
41
DispositionOfInvestmentsInAndAdvancesToAssociatedAndSubsidiaryCompaniesAbstract
Disposition of Investments in (and Advances to)
42
DispositionOfInvestmentsInAndAdvancesToAssociatedAndSubsidiaryCompanies
Disposition of Investments in (and Advances to) Associated and Subsidiary Companies
44
PurchaseOfInvestmentSecurities
Purchase of Investment Securities (a)
45
ProceedsFromSalesOfInvestmentSecurities
Proceeds from Sales of Investment Securities (a)
46
LoansMadeOrPurchased
Loans Made or Purchased
47
CollectionsOnLoans
Collections on Loans
49
NetIncreaseDecreaseInReceivablesInvestingActivities
Net (Increase) Decrease in Receivables
50
NetIncreaseDecreaseInInventoryInvestingActivities
Net (Increase) Decrease in Inventory
51
NetIncreaseDecreaseInAllowancesHeldForSpeculationInvestingActivities
Net (Increase) Decrease in Allowances Held for Speculation
52
NetIncreaseDecreaseInPayablesAndAccruedExpensesInvestingActivities
Net Increase (Decrease) in Payables and Accrued Expenses
53
OtherAdjustmentsToCashFlowsFromInvestmentActivities
Other (provide details in footnote):
53.1
OtherAdjustmentsToCashFlowsFromInvestmentActivitiesDescription
Other Investing Activities
500,000
57
CashFlowsProvidedFromUsedInInvestmentActivities
Net Cash Provided by (Used in) Investing Activities (Total of lines 34 thru 55)
69,303,756
59
CashFlowsFromFinancingActivitiesAbstract
Cash Flows from Financing Activities:
60
ProceedsFromIssuanceAbstract
Proceeds from Issuance of:
61
ProceedsFromIssuanceOfLongTermDebtFinancingActivities
Long-Term Debt (b)
40,000,000
62
ProceedsFromIssuanceOfPreferredStockFinancingActivities
Preferred Stock
63
ProceedsFromIssuanceOfCommonStockFinancingActivities
Common Stock
1
64
OtherAdjustmentsToCashFlowsFromFinancingActivities
Other (provide details in footnote):
66
NetIncreaseInShortTermDebt
Net Increase in Short-Term Debt (c)
67
OtherAdjustmentsByOutsideSourcesToCashFlowsFromFinancingActivities
Other (provide details in footnote):
70
CashProvidedByOutsideSources
Cash Provided by Outside Sources (Total 61 thru 69)
40,000,000
1
72
PaymentsForRetirementAbstract
Payments for Retirement of:
73
PaymentsForRetirementOfLongTermDebtFinancingActivities
Long-term Debt (b)
74
PaymentsForRetirementOfPreferredStockFinancingActivities
Preferred Stock
75
PaymentsForRetirementOfCommonStockFinancingActivities
Common Stock
76
OtherRetirementsOfBalancesImpactingCashFlowsFromFinancingActivities
Other (provide details in footnote):
76.1
DescriptionOfOtherRetirementsImpactingCashFlowsFromFinancingActivities
Debt Financing Costs
258,384
76.2
DescriptionOfOtherRetirementsImpactingCashFlowsFromFinancingActivities
Line of Credit (Repayments) Borrowings, Net
20,000,000
76.3
DescriptionOfOtherRetirementsImpactingCashFlowsFromFinancingActivities
Distribution of Cash from NorthWestern Corporation
253,165
78
NetDecreaseInShortTermDebt
Net Decrease in Short-Term Debt (c)
80
DividendsOnPreferredStock
Dividends on Preferred Stock
81
DividendsOnCommonStock
Dividends on Common Stock
20,746,102
83
CashFlowsProvidedFromUsedInFinancingActivities
Net Cash Provided by (Used in) Financing Activities (Total of lines 70 thru 81)
751,321
1
85
NetIncreaseDecreaseInCashAndCashEquivalentsAbstract
Net Increase (Decrease) in Cash and Cash Equivalents
86
NetIncreaseDecreaseInCashAndCashEquivalents
Net Increase (Decrease) in Cash and Cash Equivalents (Total of line 22, 57 and 83)
11,256,415
1
88
CashAndCashEquivalents
Cash and Cash Equivalents at Beginning of Period
0
90
CashAndCashEquivalents
Cash and Cash Equivalents at End of Period
11,256,416


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: NoncashAdjustmentsToCashFlowsFromOperatingActivities
 

12/31/2024

 

12/31/2023

Other Noncash Charges to Income, Net:

     

Amortization of debt issue costs, discount, and deferred hedge gain

                                   917,774

 

                                              -

Other noncash losses

                                    (13,448)

 

                                              -

Stock based compensation costs

                                   792,268

 

                                              -

 

                                1,696,594

 

                                              -

(b) Concept: OtherAdjustmentsToCashFlowsFromOperatingActivities
 

12/31/2024

 

12/31/2023

Other Assets and Liabilities, Net:

     

Net change - other current assets

                              (1,121,904)

 

                                              -

Net change - accrued utility revenues

                                   (44,492)

 

                                              -

Net change - deferred debits

                              (8,813,148)

 

                                              -

Net change - deferred credits

                                3,137,256

 

                                              -

Net change - noncurrent liabilities

                              (1,467,944)

 

                                              -

 

                              (8,310,233)

 

                                              -

(c) Concept: CashAndCashEquivalents
 

NorthWestern Public Service

 

12/31/2024

 

12/31/2023

 

12/31/2022

Cash (131)

    1,559,709

 

                  1

 

                 -

Working Funds (135)

           5,250

 

                   -

 

                 -

Other Special Deposits (134)

    9,691,457

 

                   -

 

                 -

     Total

  11,256,416

 

                  1

 

                 -

(d) Concept: CashAndCashEquivalents
 

NorthWestern Public Service

 

12/31/2024

 

12/31/2023

 

12/31/2022

Cash (131)

    1,559,709

 

                  1

 

                 -

Working Funds (135)

           5,250

 

                   -

 

                 -

Other Special Deposits (134)

    9,691,457

 

                   -

 

                 -

     Total

  11,256,416

 

                  1

 

                 -


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
NOTES TO FINANCIAL STATEMENTS
  1. Use the space below for important notes regarding the Balance Sheet, Statement of Income for the year, Statement of Retained Earnings for the year, and Statement of Cash Flows, or any account thereof. Classify the notes according to each basic statement, providing a subheading for each statement except where a note is applicable to more than one statement.
  2. Furnish particulars (details) as to any significant contingent assets or liabilities existing at end of year, including a brief explanation of any action initiated by the Internal Revenue Service involving possible assessment of additional income taxes of material amount, or of a claim for refund of income taxes of a material amount initiated by the utility. Give also a brief explanation of any dividends in arrears on cumulative preferred stock.
  3. For Account 116, Utility Plant Adjustments, explain the origin of such amount, debits and credits during the year, and plan of disposition contemplated, giving references to Commission orders or other authorizations respecting classification of amounts as plant adjustments and requirements as to disposition thereof.
  4. Where Accounts 189, Unamortized Loss on Reacquired Debt, and 257, Unamortized Gain on Reacquired Debt, are not used, give an explanation, providing the rate treatment given these items. See General Instruction 17 of the Uniform System of Accounts.
  5. Give a concise explanation of any retained earnings restrictions and state the amount of retained earnings affected by such restrictions.
  6. If the notes to financial statements relating to the respondent company appearing in the annual report to the stockholders are applicable and furnish the data required by instructions above and on pages 114-121, such notes may be included herein.
  7. For the 3Q disclosures, respondent must provide in the notes sufficient disclosures so as to make the interim information not misleading. Disclosures which would substantially duplicate the disclosures contained in the most recent FERC Annual Report may be omitted.
  8. For the 3Q disclosures, the disclosures shall be provided where events subsequent to the end of the most recent year have occurred which have a material effect on the respondent. Respondent must include in the notes significant changes since the most recently completed year in such items as: accounting principles and practices; estimates inherent in the preparation of the financial statements; status of long-term contracts; capitalization including significant new borrowings or modifications of existing financing agreements; and changes resulting from business combinations or dispositions. However were material contingencies exist, the disclosure of such matters shall be provided even though a significant change since year end may not have occurred.
  9. Finally, if the notes to the financial statements relating to the respondent appearing in the annual report to the stockholders are applicable and furnish the data required by the above instructions, such notes may be included herein.

 

 

 

NOTES TO FINANCIAL STATEMENTS

 

 

(1)           Nature of Operations

 

Northwestern Energy Public Service Corporation (NWE Public Service), a direct wholly-owned subsidiary of NorthWestern Energy Group, Inc., doing business as NorthWestern Energy, provides electricity and / or natural gas to approximately 159,100 customers in South Dakota and Nebraska. We have generated and distributed electricity in South Dakota and distributed natural gas in South Dakota and Nebraska since 1923.

 

The Financial Statements for the periods included herein have been prepared by NWE Public Service (NorthWestern, we, or us) pursuant to the rules and regulations of the Federal Energy Regulatory Commission (FERC) as set forth in its applicable Uniform System of Accounts and published accounting releases. The preparation of financial statements in conformity with the accounting requirements of the FERC as set forth in its applicable Uniform System of Accounts and published accounting releases requires management to make estimates and assumptions that may affect the reported amounts of assets, liabilities, revenues and expenses during the reporting period. Actual results could differ from those estimates.

 

The following notes to the financials statements appear in NWE Public Service’s annual report to the shareholders and are prepared in conformity with GAAP. This report differs from GAAP due to FERC requiring the presentation of subsidiaries on the equity method of accounting, which differs from Accounting Standards Codification (ASC) 810, Consolidation. ASC 810 requires that all majority-owned subsidiaries be consolidated. The other significant differences consist of the following:

 

          Removal and decommissioning costs of generation, transmission and distribution assets are reflected in the Balance Sheets as a component of accumulated depreciation of $93.2 million as of December 31, 2024 in accordance with regulatory treatment as compared to regulatory liabilities for GAAP purposes;

 

          Goodwill is reflected in the Balance Sheets as a utility plant adjustments of $93.8 million as of December 31, 2024 in accordance with regulatory treatment, as compared to goodwill for GAAP purposes (see Note 7);

 

          The current portion of gas stored underground is reflected in the Balance Sheets as current and accrued assets, as compared to inventory for GAAP purposes;

 

          Operating lease right of use assets are reflected in the Balance Sheets as capital leases of $0.2 million as of December 31, 2024 in accordance with regulatory treatment, as compared to non-current assets for GAAP purposes;

 

          Operating lease liabilities are reflected in the Balance Sheets as current and long term obligations under capital leases of $0.2 million as of December 31, 2024 in accordance with regulatory treatment, as compared to accrued expenses and long term liabilities for GAAP purposes;

 

          Unamortized debt expense is classified in the Balance Sheets as deferred debits in accordance with regulatory treatment, as compared to long-term debt for GAAP purposes;

 

          Current and long-term debt is classified in the Balance Sheets as all long-term debt in accordance with regulatory treatment, while current and long-term debt are presented separately for GAAP reporting;

 

          The current portion of the provision for injuries and damages and the expected insurance proceeds receivable related to the provision for injuries and damages are reported as a current liability for GAAP purposes, as compared to a non-current liability for FERC purposes;

 

          Accumulated deferred tax assets and liabilities are classified in the Balance Sheets as gross non-current deferred debits and credits, respectively, while GAAP presentation reflects a net non-current deferred tax liability;

 

          Stranded tax effects associated with the Tax Cuts and Jobs Act are included in accumulated other comprehensive income (AOCI) in accordance with regulatory treatment, while included in retained earnings for GAAP purposes;

 

          Uncertain tax positions related to temporary differences are classified in the Balance Sheets within the deferred tax accounts in accordance with regulatory treatment, as compared to other noncurrent liabilities for GAAP purposes. In addition, interest related to uncertain tax positions is recognized in interest expense in accordance with regulatory treatment, as compared to income tax expense for GAAP purposes;

 

          Net periodic benefit costs and net periodic post retirement benefit costs are reflected in operating expense for FERC purposes, as compared to the GAAP presentation, which reflects the current service costs component of the net periodic benefit costs in operating expenses and the other components outside of income from operations. In addition, only the service cost component of net periodic benefit cost is eligible for capitalization for GAAP purposes, as compared to the total net periodic benefit costs for FERC purposes;

 

          Regulatory assets and liabilities are reflected in the Balance Sheets as non-current items, while current and non-current amounts are presented separately for GAAP;

 

          Unbilled revenue is reflected in the Balance Sheets in Accrued utility revenues in accordance with regulatory treatment, as compared to Accounts receivable, net for GAAP purposes;

 

          Implementation costs associated with cloud computing arrangements are reflected on the Balance Sheets as Miscellaneous Intangible Plant in accordance with regulatory treatment, as compared to Other current assets for GAAP purposes. Additionally, these cash outflows are presented within investing activities cash outflows in the Statement of Cash Flows in accordance with regulatory treatment, as compared to operating activities cash outflows for GAAP purposes; and

 

          GAAP revenue differs from FERC revenue primarily due to the equity method of accounting as discussed above, netting of electric purchases and sales for resale in revenue for the GAAP presentation as compared to a gross presentation for FERC purposes (with the exception of those transactions in a regional transmission organization (RTO)), the netting of RTO transmission transactions for the GAAP presentation as compared to a gross presentation for FERC purposes, and the classification of regulatory amortizations in revenue for GAAP purposes as compared to expense for FERC purposes.

 

Events occurring subsequent to December 31, 2024, have been evaluated as to their potential impact to the Financial Statements through the date of this report.

 

 

 

Holding Company Reorganization

 

NWE Public Service was incorporated on May 30, 2023, as a direct wholly-owned subsidiary of NorthWestern Corporation (NW Corp) in preparation of a holding company reorganization. On this date, NWE Public Service issued 100 shares of $0.01 par value common stock to NW Corp for $1. NWE Public Service had no other financial activity during the year ended December 31, 2023.

 

On October 2, 2023, NW Corp and NorthWestern Energy Group, Inc. completed a merger transaction pursuant to which NorthWestern Energy Group, Inc. became the holding company parent of NW Corp. On January 1, 2024, NorthWestern Energy Group, Inc. completed the second and final phase of the holding company reorganization. NW Corp contributed the assets and liabilities of its South Dakota and Nebraska regulated utilities to NWE Public Service, and then distributed its equity interest in NWE Public Service and certain other subsidiaries to NorthWestern Energy Group, Inc., resulting in NW Corp owning and operating the Montana regulated utility and NWE Public Service owning and operating the Nebraska and South Dakota utilities, each as a direct subsidiary of NorthWestern Energy Group, Inc. As NWE Public Service did not have any utility operations before January 1, 2024, these Financial Statements do not include comparative prior year results.

 

The below table represents the net assets that NW Corp contributed to NWE Public Service on January 1, 2024:

 

Net assets contributed to NWE Public Service on January 1, 2024:

ASSETS

 

Current Assets:

 

Cash and cash equivalents

$ 253 

Accounts receivable, net

 37,547 

Inventories

 31,717 

Regulatory assets

 5,681 

Prepaid expenses and other

 10,755 

      Total current assets 

 85,953 

Property, plant, and equipment, net

 1,067,549 

Goodwill

 93,779 

Regulatory assets

 93,933 

Other noncurrent assets

 9,558 

      Total Assets 

$ 1,350,772 

LIABILITIES

 

Current Liabilities:

 

Accounts payable

 28,751 

Accrued expenses

 27,392 

Regulatory liabilities

 20,766 

      Total current liabilities 

 76,909 

Long-term debt

 532,148 

Deferred income taxes

 25,033 

Noncurrent regulatory liabilities

 106,307 

Other noncurrent liabilities

 29,850 

Total Liabilities

$ 770,247 

Total Net Assets Contributed to NWE Public Service

$ 580,525 

 

 

 

(2)           Significant Accounting Policies

 

Use of Estimates

 

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Financial Statements and the reported amounts of revenues and expenses during the reporting period. Estimates are used for such items as long-lived asset values and impairment charges, long-lived asset useful lives, tax provisions, uncertain tax position reserves, AROs, regulatory assets and liabilities, allowances for uncollectible accounts, our QF liability, environmental liabilities, unbilled revenues and actuarially determined benefit costs and liabilities. We revise the recorded estimates when we receive better information or when we can determine actual amounts. Those revisions can affect operating results.

 

Revenue Recognition

 

The Company recognizes revenue as customers obtain control of promised goods and services in an amount that reflects consideration expected in exchange for those goods or services. Generally, the delivery of electricity and natural gas results in the transfer of control to customers at the time the commodity is delivered and the amount of revenue recognized is equal to the amount billed to each customer, including estimated volumes delivered when billings have not yet occurred.

 

Cash Equivalents

 

We consider all highly liquid investments with maturities of three months or less at the time of purchase to be cash equivalents.

 

Restricted Cash

 

Restricted cash consists primarily of funds held in trust accounts to satisfy the requirements of certain stipulation agreements and insurance reserve requirements.

 

Accounts Receivable, Net

 

Accounts receivable are net of allowances for uncollectible accounts of $0.3 million at December 31, 2024. Receivables include unbilled revenues of $21.1 million at December 31, 2024.

 

Regulation of Utility Operations

 

Our regulated operations are subject to the provisions of ASC 980, Regulated Operations. Regulated accounting is appropriate provided that (i) rates are established by or subject to approval by independent, third-party regulators, (ii) rates are designed to recover the specific enterprise's cost of service, and (iii) in view of demand for service, it is reasonable to assume that rates are set at levels that will recover costs and can be charged to and collected from customers.

 

Our Financial Statements reflect the effects of the different rate making principles followed by the jurisdictions regulating us. The economic effects of regulation can result in regulated companies recording costs that have been, or are deemed probable to be, allowed in the ratemaking process in a period different from the period in which the costs would be charged to expense by an unregulated enterprise. When this occurs, costs are deferred as regulatory assets and recorded as expenses in the periods when those same amounts are reflected in rates. Additionally, regulators can impose liabilities upon a regulated company for amounts previously collected from customers and for amounts that are expected to be refunded to customers (regulatory liabilities).

 

If we were required to terminate the application of these provisions to our regulated operations, all such deferred amounts would be recognized in the Statements of Income at that time. This would result in a charge to earnings and accumulated other comprehensive income (AOCI), net of applicable income taxes, which could be material. In addition, we would determine any impairment to the carrying costs of deregulated plant and inventory assets.

 

Derivative Financial Instruments

 

We account for derivative instruments in accordance with ASC 815, Derivatives and Hedging. All derivatives are recognized in the Balance Sheets at their fair value unless they qualify for certain exceptions, including the normal purchases and normal sales exception. Additionally, derivatives that qualify and are designated for hedge accounting are classified as either hedges of the fair value of a recognized asset or liability or of an unrecognized firm commitment (fair-value hedge) or hedges of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (cash-flow hedge). For fair-value hedges, changes in fair values for both the derivative and the underlying hedged exposure are recognized in earnings each period. For cash-flow hedges, the portion of the derivative gain or loss that is effective in offsetting the change in the cost or value of the underlying exposure is deferred in AOCI and later reclassified into earnings when the underlying transaction occurs. Gains and losses from the ineffective portion of any hedge are recognized in earnings immediately. For other derivative contracts that do not qualify or are not designated for hedge accounting, changes in the fair value of the derivatives are recognized in earnings each period. Cash inflows and outflows related to derivative instruments are included as a component of operating, investing or financing cash flows in the Statements of Cash Flows, depending on the underlying nature of the hedged items. As of December 31, 2024, the only derivative instruments we have qualify for the normal purchases and normal sales exception.

 

Revenues and expenses on contracts that are designated as normal purchases and normal sales are recognized when the underlying physical transaction is completed. While these contracts are considered derivative financial instruments, they are not required to be recorded at fair value, but on an accrual basis of accounting. Normal purchases and normal sales are contracts where physical delivery is probable, quantities are expected to be used or sold in the normal course of business over a reasonable period of time, and price is not tied to an unrelated underlying derivative. As part of our regulated electric and gas operations, we enter into contracts to buy and sell energy to meet the requirements of our customers. These contracts include short-term and long-term commitments to purchase and sell energy in the retail and wholesale markets with the intent and ability to deliver or take delivery. If it were determined that a transaction designated as a normal purchase or a normal sale no longer met the exceptions, the fair value of the related contract would be reflected as an asset or liability and immediately recognized through earnings. See Note 8 - Risk Management and Hedging Activities, for further discussion of our derivative activity.

 

Property, Plant and Equipment

 

Property, plant and equipment are stated at original cost, including contracted services, direct labor and material, allowance for funds used during construction (AFUDC), and indirect charges for engineering, supervision and similar overhead items. All expenditures for maintenance and repairs of utility property, plant and equipment are charged to the appropriate maintenance expense accounts. A betterment or replacement of a unit of property is accounted for as an addition and retirement of utility plant. At the time of such a retirement, the accumulated provision for depreciation is charged with the original cost of the property retired and also for the net cost of removal. Also included in plant and equipment are assets under finance lease, which are stated at the present value of minimum lease payments.

 

AFUDC represents the cost of financing construction projects with borrowed funds and equity funds. While cash is not realized currently from such allowance, it is realized under the ratemaking process over the service life of the related property through increased revenues resulting from a higher rate base and higher depreciation expense. The component of AFUDC attributable to borrowed funds is included as a reduction to interest expense, while the equity component is included in other income. This rate averaged 6.9% in 2024. AFUDC capitalized totaled $1.6 million for the year ended December 31, 2024.

 

We record provisions for depreciation at amounts substantially equivalent to calculations made on a straight-line method by applying various rates based on useful lives of the various classes of properties (ranging from 5 to 95) determined from engineering studies. As a percentage of the depreciable utility plant at the beginning of the year, our provision for depreciation of utility plant was approximately 3.4% for 2024.

 

Depreciation rates include a provision for our share of the estimated costs to decommission our jointly owned plants at the end of the useful life. The annual provision for such costs is included in depreciation expense, while the accumulated provisions are included in noncurrent regulatory liabilities.

 

Pension and Postretirement Benefits

 

We have liabilities under defined benefit retirement plans and a postretirement plan that offers certain health care and life insurance benefits to eligible employees and their dependents. The costs of these plans are dependent upon numerous factors, assumptions and estimates, including determination of discount rate, expected return on plan assets, rate of future compensation increases, age and mortality and employment periods. In determining the projected benefit obligations and costs, assumptions can change from period to period and may result in material changes in the cost and liabilities we recognize.

 

Income Taxes

 

We follow the liability method in accounting for income taxes. Deferred income tax assets and liabilities represent the future effects on income taxes from temporary differences between the bases of assets and liabilities for financial reporting and tax purposes. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to reverse. The probability of realizing deferred tax assets is based on forecasts of future taxable income and the availability of tax planning strategies that can be implemented, if necessary, to realize deferred tax assets. We establish a valuation allowance when it is more likely than not that all, or a portion of, a deferred tax asset will not be realized.

 

Exposures exist related to various tax filing positions, which may require an extended period of time to resolve and may result in income tax adjustments by taxing authorities. We have reduced deferred tax assets or established liabilities based on our best estimate of future probable adjustments related to these exposures. On a quarterly basis, we evaluate exposures in light of any additional information and make adjustments as necessary to reflect the best estimate of the future outcomes. We believe our deferred tax assets and established liabilities are appropriate for estimated exposures; however, actual results may differ from these estimates. The resolution of tax matters in a particular future period could have a material impact on our Income Statements and provision for income taxes.

 

Under the Inflation Reduction Act of 2022 our production tax credits may be transferred to an unrelated entity. Our policy is to account for these transferable credits within income tax expense.

 

Environmental Costs

 

We record environmental costs when it is probable we are liable for the costs and we can reasonably estimate the liability. We may defer costs as a regulatory asset if there is precedent for recovering similar costs from customers in rates. Otherwise, we expense the costs. If an environmental cost is related to facilities we currently use, such as pollution control equipment, then we may capitalize and depreciate the costs over the remaining life of the asset, assuming the costs are recoverable in future rates or future cash flows.

 

Our remediation cost estimates are based on the use of an environmental consultant, our experience, our assessment of the current situation and the technology currently available for use in the remediation. We regularly adjust the recorded costs as we revise estimates and as remediation proceeds. If we are one of several designated responsible parties, then we estimate and record only our share of the cost.

 

Supplemental Cash Flow Information

 

Year Ended December 31,

 

2024

Cash paid (received) for:

 

Production tax credits(1)

$ (6,867)

Interest

 22,952 

Significant non-cash transactions:

 

Capital expenditures included in trade accounts payable

 3,840 

(1) Proceeds from production tax credits transferred are included in cash provided by operating activities within the Statement of Cash Flows.

 

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Balance Sheets that sum to the total of the same such amounts shown in the Statements of Cash Flows (in thousands):

 

December 31,

 

2024

Cash and cash equivalents

$ 1,565 

Restricted cash

 9,691 

Total cash, cash equivalents, and restricted cash shown in the Statements of Cash Flows

$ 11,256 

 

Restricted cash consists primarily of funds held in trust accounts to satisfy the requirements of certain stipulation agreements and insurance reserve requirements.

 

Accounting Standards Issued

 

There were no accounting standards adopted in the current year that had a material impact to our financial condition, results of operations, and cash flows. At this time, we are not expecting the adoption of recently issued accounting standards to have a material impact to our financial condition, results of operations, and cash flows.

 

(3)           Regulatory Matters

 

South Dakota Natural Gas Rate Review

 

In June 2024, we filed a natural gas rate review (2023 test year) with the South Dakota Public Utilities Commission (SDPUC) for an annual increase to natural gas rates totaling approximately $6.0 million. Our request was based on a rate of return of 7.75 percent and rate base of $95.6 million. In December 2024, the SDPUC issued a final order approving the settlement agreement between NorthWestern and SDPUC Staff for an annual increase in base rates of approximately $4.6 million and an authorized rate of return of 6.91 percent. The approved settlement is based on a rate base of $96.2 million. Final rates were effective December 19, 2024.

 

Nebraska Natural Gas Rate Review

 

In June 2024, we filed a natural gas rate review (2023 test year) with the Nebraska Public Service Commission (NPSC). The filing requests a base rate annual revenue increase of $3.6 million. Our request is based on a return on equity of 10.70 percent, a capital structure including 53.13 percent equity, and rate base of $47.4 million. Interim rates, which increased base natural gas rates $2.3 million, were implemented on October 1, 2024. Interim rates will remain in effect on a refundable basis until the NPSC issues a final order.

 

 

(4)           Regulatory Assets and Liabilities

 

We prepare our Financial Statements in accordance with the provisions of ASC 980, as discussed in Note 2 - Significant Accounting Policies. Pursuant to this guidance, certain expenses and credits, normally reflected in income as incurred, are deferred and recognized when included in rates and recovered from or refunded to customers. Regulatory assets and liabilities are recorded based on management's assessment that it is probable that a cost will be recovered or that an obligation has been incurred. Accordingly, we have recorded the following major classifications of regulatory assets and liabilities that will be recognized in expenses and revenues in future periods when the matching revenues are collected or refunded. Of these regulatory assets and liabilities, energy supply costs are the only items earning a rate of return. The remaining regulatory items have corresponding assets and liabilities that will be paid for or refunded in future periods.

 

 

Note Reference

 

Remaining Amortization Period

 

December 31,

 

2024

 

 

 

(in thousands)

Flow-through income taxes

12

 

Plant Lives

 

$ 74,250 

Environmental clean-up

17

 

Undetermined

 

 11,257 

Supply costs

 

 

1 Year

 

 10,309 

Excess deferred income taxes

12

 

Plant Lives

 

 6,580 

Pension

14

 

See Note 14

 

 5,376 

Deferred financing costs

11

 

See Note 11

 

 793 

State & local taxes & fees

 

 

1 Year

 

 61 

Other

 

 

Various

 

 565 

   Total Regulatory Assets 

 

 

 

 

$ 109,191 

Removal cost

6

 

Plant Lives

 

$ 93,152 

Excess deferred income taxes

12

 

Plant Lives

 

 17,725 

Supply costs

 

 

1 Year

 

 15,840 

State & local taxes & fees

 

 

1 Year

 

 205 

Other

 

 

Various

 

 747 

   Total Regulatory Liabilities 

 

 

 

 

$ 127,669 

 

Income Taxes

 

Flow-through income taxes primarily reflect the effects of plant related temporary differences such as flow-through of depreciation, repairs related deductions, and removal costs that we will recover or refund in future rates. We amortize these amounts as temporary differences reverse. Excess deferred income tax assets and liabilities are recorded as a result of the Tax Cuts and Jobs Act and will be recovered or refunded in future rates. See Note 12 - Income Taxes for further discussion.

 

Environmental Clean-Up

 

Environmental clean-up costs are the estimated costs of investigating and cleaning up contaminated sites we own. We discuss the specific sites and clean-up requirements further in Note 17 - Commitments and Contingencies. Environmental clean-up costs are typically recoverable in customer rates when they are actually incurred. When cost projections become known and measurable, we coordinate with the appropriate regulatory authority to determine a recovery period.

 

Supply Costs

 

The SDPUC and NPSC have authorized the use of electric and natural gas supply cost trackers that enable us to track actual supply costs and either recover the under collection or refund the over collection to our customers. Accordingly, we have recorded a regulatory asset and liability to reflect the future recovery of under collections and refunding of over collections through the ratemaking process. We earn interest on natural gas supply costs under collected, or apply interest to an over collection, of 6.8 percent and 6.9 percent for electric and natural gas, respectively, in South Dakota; and 8.5 percent for natural gas in Nebraska.

 

Pension and Employee Related Benefits

 

We recognize the unfunded portion of plan benefit obligations in the Balance Sheets, which is remeasured at each year end, with a corresponding adjustment to regulatory assets/liabilities as the costs associated with these plans are recovered in rates. The SDPUC allows recovery of pension and postretirement benefit costs on an accrual basis.

 

Deferred Financing Costs

 

Consistent with our historical regulatory treatment, a regulatory asset has been established to reflect the remaining deferred financing costs on long-term debt that has been replaced through the issuance of new debt. These amounts are amortized over the life of the new debt.

 

Removal Cost

 

The anticipated costs of removing assets upon retirement are collected from customers in advance of removal activity as a component of depreciation expense. Our depreciation method, including cost of removal, is established by the respective regulatory commissions. Therefore, consistent with this regulated treatment, we reflect this accrual of removal costs for our regulated assets by increasing our regulatory liability. See Note 6 - Asset Retirement Obligations, for further information regarding this item.

 

 

 

(5)           Property, Plant and Equipment

 

The following table presents the major classifications of our property, plant and equipment (in thousands):

 

 

December 31,

 

2024

 

(in thousands)

Electric Plant

$ 1,145,833 

Natural Gas Plant

 286,843 

Plant acquisition adjustment(1)

 30,010 

Common and Other Plant

 72,896 

Construction work in process

 31,027 

Total property, plant and equipment

 1,566,609 

Less accumulated depreciation

 (457,466)

Less accumulated amortization

 (15,904)

Net property, plant and equipment

$ 1,093,239 

 

(1) The plant acquisition adjustment balance above includes our Beethoven wind project acquired in 2015. The acquisition adjustment is amortized on a straight-line basis over the estimated remaining useful life in depreciation expense.

 

Jointly Owned Electric Generating Plant

 

We have an ownership interest in three base-load electric generating plants, all of which are coal fired and operated by other companies. We have an undivided interest in these facilities and are responsible for our proportionate share of the capital and operating costs while being entitled to our proportionate share of the power generated. Our interest in each plant is reflected in the Balance Sheets on a pro rata basis and our share of operating expenses is reflected in the Statements of Income. The participants each finance their own investment.

 

Information relating to our ownership interest in these facilities is as follows (in thousands):

 

Big Stone

(SD)

 

Neal #4

(IA)

 

Coyote

(ND)

December 31, 2024

 

 

 

 

 

Ownership percentages

 23.4 %

 

 8.7 %

 

 10.0 %

Plant in service

$ 157,572 

 

$ 65,426 

 

$ 52,430 

Accumulated depreciation

 49,573 

 

 39,025 

 

 39,887 

 

 

 

(6)           Asset Retirement Obligations

 

We are obligated to dispose of certain long-lived assets upon their abandonment. We recognize a liability for the legal obligation to perform an asset retirement activity in which the timing and/or method of settlement are conditional on a future event. We measure the liability at fair value when incurred and capitalize a corresponding amount as part of the book value of the related assets, which increases our property, plant and equipment and other noncurrent liabilities. The increase in the capitalized cost is included in determining depreciation expense over the estimated useful life of these assets. Since the fair value of the asset retirement obligation (ARO) is determined using a present value approach, accretion of the liability due to the passage of time is recognized each period and recorded as a regulatory asset until the settlement of the liability. Revisions to estimated AROs can result from changes in retirement cost estimates, revisions to estimated inflation rates, and changes in the estimated timing of abandonment. If the obligation is settled for an amount other than the carrying amount of the liability, we will recognize a regulatory asset or liability for the difference, which will be surcharged/refunded to customers through the rate making process. We record regulatory assets and liabilities for differences in timing of asset retirement costs recovered in rates and AROs recorded since asset retirement costs are recovered through rates charged to customers.

 

Our AROs relate to the reclamation and removal costs at our jointly-owned coal-fired generation facilities, U.S. Department of Transportation requirements to cut, purge and cap retired natural gas pipeline segments, and to remove all above-ground wind power facilities and restore the soil surface at the end of their life. The following table presents the change in our ARO (in thousands):

 

December 31,

 

2024

Liability at January 1,

$ 6,616 

Accretion expense

 311 

Liabilities incurred

  

Liabilities settled

 (120)

Revisions to cash flows

 34 

Liability at December 31,

$ 6,841 

 

During the twelve months ended December 31, 2024, our ARO liability decreased $0.1 million for partial settlement of the legal obligations at our jointly-owned coal-fired generation facilities and natural gas pipeline segments.

 

In addition, we have identified removal liabilities related to our electric and natural gas transmission and distribution assets that have been installed on easements over property not owned by us. The easements are generally perpetual and only require remediation action upon abandonment or cessation of use of the property for the specified purpose. The ARO liability is not estimable for such easements as we intend to utilize these properties indefinitely. In the event we decide to abandon or cease the use of a particular easement, an ARO liability would be recorded at that time. We also identified AROs associated with our hydroelectric generating facilities; however, due to the indeterminate removal date, the fair value of the associated liabilities currently cannot be estimated and no amounts are recognized in the Financial Statements.

 

We collect removal costs in rates for certain transmission and distribution assets that do not have associated AROs. Generally, the accrual of future non-ARO removal obligations is not required; however, long-standing ratemaking practices approved by applicable state and federal regulatory commissions have allowed provisions for such costs in historical depreciation rates. The recorded amounts of costs collected from customers through depreciation rates are classified as a regulatory liability in recognition of the fact that we have collected these amounts that will be used in the future to fund asset retirement costs and do not represent legal retirement obligations. See Note 4 - Regulatory Assets and Liabilities for removal costs recorded as regulatory liabilities on the Balance Sheets as of December 31, 2024.

 

 

(7)           Goodwill

 

We completed our annual goodwill impairment test as of April 1, 2024, and no impairment was identified. We calculate the fair value of our reporting units by considering various factors, including valuation studies based primarily on a discounted cash flow analysis, with published industry valuations and market data as supporting information. Key assumptions in the determination of fair value include the use of an appropriate discount rate and estimated future cash flows. In estimating cash flows, we incorporate expected long-term growth rates in our service territory, regulatory stability, and commodity prices (where appropriate), as well as other factors that affect our revenue, expense and capital expenditure projections.

 

Goodwill by segment is as follows (in thousands):

 

December 31,

 

2024

Electric

$ 63,667 

Natural gas

 30,112 

Total Goodwill

$ 93,779 

 

 

 

(8)           Risk Management and Hedging Activities

 

Nature of Our Business and Associated Risks

 

We are exposed to certain risks related to the ongoing operations of our business, including the impact of market fluctuations in the price of electricity and natural gas commodities and changes in interest rates. We rely on market purchases to fulfill a portion of our electric and natural gas supply requirements. Several factors influence price levels and volatility. These factors include, but are not limited to, seasonal changes in demand, weather conditions, available generating assets within regions, transportation availability and reliability within and between regions, fuel availability, market liquidity, and the nature and extent of current and potential federal and state regulations.

 

Objectives and Strategies for Using Derivatives

 

To manage our exposure to fluctuations in commodity prices we routinely enter into derivative contracts. These types of contracts are included in our electric and natural gas supply portfolios and are used to manage price volatility risk by taking advantage of fluctuations in market prices. While individual contracts may be above or below market value, the overall portfolio approach is intended to provide greater price stability for consumers. We do not maintain a trading portfolio, and our derivative transactions are only used for risk management purposes consistent with regulatory guidelines.

 

In addition, we may use interest rate swaps to manage our interest rate exposures associated with new debt issuances or to manage our exposure to fluctuations in interest rates on variable rate debt.

 

Accounting for Derivative Instruments

 

We evaluate new and existing transactions and agreements to determine whether they are derivatives. The permitted accounting treatments include: normal purchase normal sale (NPNS); cash flow hedge; fair value hedge; and mark-to-market.

Mark-to-market accounting is the default accounting treatment for all derivatives unless they qualify, and we specifically designate them, for one of the other accounting treatments. Derivatives designated for any of the elective accounting treatments must meet specific, restrictive criteria both at the time of designation and on an ongoing basis. The changes in the fair value of recognized derivatives are recorded each period in current earnings or other comprehensive income, depending on whether a derivative is designated as part of a hedge transaction and the type of hedge transaction.

 

Normal Purchases and Normal Sales

 

We have applied the NPNS scope exception to our contracts involving the physical purchase and sale of gas and electricity at fixed prices in future periods. During our normal course of business, we enter into full-requirement energy contracts, power purchase agreements and physical capacity contracts, which qualify for NPNS. All of these contracts are accounted for using the accrual method of accounting; therefore, there were no unrealized amounts recorded in the Financial Statements at December 31, 2024. Revenues and expenses from these contracts are reported on a gross basis in the appropriate revenue and expense categories as the commodities are received or delivered.

 

Credit Risk

 

Credit risk is the potential loss resulting from counterparty non-performance under an agreement. We manage credit risk with policies and procedures for, among other things, counterparty analysis and exposure measurement, monitoring and mitigation. We limit credit risk in our commodity and interest rate derivatives activities by assessing the creditworthiness of potential counterparties before entering into transactions with them and continuing to evaluate their creditworthiness on an ongoing basis.

 

We are exposed to credit risk through buying and selling electricity and natural gas to serve customers. We may request collateral or other security from our counterparties based on the assessment of creditworthiness and expected credit exposure. It is possible that volatility in commodity prices could cause us to have material credit risk exposures with one or more counterparties. We enter into commodity master enabling agreements with our counterparties to mitigate credit exposure, as these agreements reduce the risk of default by allowing us or our counterparty the ability to make net payments. The agreements generally are: (1) Western Systems Power Pool agreements – standardized power purchase and sales contracts in the electric industry; (2) International Swaps and Derivatives Association agreements – standardized financial gas and electric contracts; (3) North American Energy Standards Board agreements – standardized physical gas contracts; and (4) Edison Electric Institute Master Purchase and Sale Agreements – standardized power sales contracts in the electric industry.

 

Many of our forward purchase contracts contain provisions that require us to maintain an investment grade credit rating from each of the major credit rating agencies. If our credit rating were to fall below investment grade, the counterparties could require immediate payment or demand immediate and ongoing full overnight collateralization on contracts in net liability positions,

 

 

(9)           Fair Value Measurements

 

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (i.e., an exit price). Measuring fair value requires the use of market data or assumptions that market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs can be readily observable, corroborated by market data, or generally unobservable. Valuation techniques are required to maximize the use of observable inputs and minimize the use of unobservable inputs.

 

Applicable accounting guidance establishes a hierarchy that prioritizes the inputs used to measure fair value, and requires fair value measurements to be categorized based on the observability of those inputs. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 inputs) and the lowest priority to unobservable inputs (Level 3 inputs). The three levels of the fair value hierarchy are as follows:

 

          Level 1 – Unadjusted quoted prices available in active markets at the measurement date for identical assets or liabilities;

          Level 2 – Pricing inputs, other than quoted prices included within Level 1, which are either directly or indirectly observable as of the reporting date; and

          Level 3 – Significant inputs that are generally not observable from market activity.

 

We classify assets and liabilities within the fair value hierarchy based on the lowest level of input that is significant to the fair value measurement of each individual asset and liability taken as a whole. Due to the short-term nature of cash and cash equivalents, accounts receivable, net, accounts payable, and short-term borrowings, the carrying amount of each such item approximates fair value. There are no components of our assets or liabilities measured at fair value in the Financial Statements at December 31, 2024.

 

Financial Instruments

 

The estimated fair value of financial instruments is summarized as follows (in thousands):

 

December 31, 2024

 

Carrying Amount

 

Fair Value

Liabilities:

 

 

 

Long-term debt

$ 552,186 

 

$ 504,498 

 

The estimated fair value amounts have been determined using available market information and appropriate valuation methodologies; however, considerable judgment is required in interpreting market data to develop estimates of fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts that we would realize in a current market exchange.

 

We determined fair value for long-term debt based on interest rates that are currently available to us for issuance of debt with similar terms and remaining maturities, except for publicly traded debt, for which fair value is based on market prices for the same or similar issues or upon the quoted market prices of U.S. treasury issues having a similar term to maturity, adjusted for our bond issuance rating and the present value of future cash flows. These are significant other observable inputs, or level 2 inputs, in the fair value hierarchy.

 

 

(10)           Unsecured Credit Facilities

 

On November 29, 2023, we, along with NorthWestern Energy Group, Inc., entered into a new $200.0 million unsecured revolver credit facility with base sublimits of $50.0 million for NorthWestern Energy Group, Inc. and $150.0 million for NWE Public Service (the HoldCo and NWE Public Service Credit Facility). The HoldCo and NWE Public Service Credit Facility has a maturity date of November 29, 2028. Upon the completion of the holding company reorganization on January 1, 2024, this credit facility became effective. The HoldCo and NWE Public Service Credit Facility has uncommitted features that allow both NorthWestern Energy Group, Inc. and NWE Public Service to request one-year extensions to the maturity date and increase the size of the credit facility by an additional $50 million. The credit facility also gives us the flexibility to adjust the sublimits as needed, provided that NorthWestern Energy Group's base sublimit cannot exceed $100.0 million and NWE Public Service's sublimit cannot exceed $200.0 million. Borrowings may be made at interest rates equal to (a) SOFR, plus a credit spread adjustment of 10.0 basis points plus a margin of 100.0 to 175.0 basis points, or (b) a base rate, plus a margin of 0.0 to 75.0 basis points.

 

Commitment fees for the unsecured revolving lines of credit was $0.2 million for the year ended December 31, 2024.

 

The availability under the facilities in place for the year ended December 31, 2024, is shown in the following table (in millions):

 

2024

Unsecured revolving line of credit, expiring November 2028

$ 150.0 

 

 

Amounts outstanding at December 31:

 

SOFR borrowings

 34.0 

Letters of credit

  

 

 34.0 

 

 

Net availability as of December 31

$ 116.0 

 

Our credit facilities include covenants that require us to meet certain financial tests, including a maximum debt to capitalization ratio not to exceed 65 percent. The facilities also contain covenants which, among other things, limit our ability to engage in any consolidation or merger or otherwise liquidate or dissolve, dispose of property, and enter into transactions with affiliates. A default on the South Dakota First Mortgage Bonds would trigger a cross default on the NWE Public Service sublimit of the HoldCo and NWE Public Service Credit Facility; however, a default on the HoldCo and NWE Public Service Credit Facility would not trigger a default on the South Dakota First Mortgage Bonds.

 

 

(11)           Long-Term Debt and Finance Leases

Long-term debt and finance leases consisted of the following (in thousands):

 

 

 

December 31,

 

Due

 

2024

Unsecured Debt:

 

 

 

Unsecured Revolving Line of Credit

2028

 

$ 34,000 

Secured Debt:

 

 

 

Mortgage bonds—

 

 

 

South Dakota—5.01%

2025

 

 64,000 

South Dakota—2.80%

2026

 

 60,000 

South Dakota—2.66%

2026

 

 45,000 

South Dakota—5.55%

2029

 

 33,000 

South Dakota—3.21%

2030

 

 50,000 

South Dakota—5.57%

2033

 

 31,000 

South Dakota—5.42%

2033

 

 30,000 

South Dakota—5.75%

2034

 

 7,000 

South Dakota—4.26%

2040

 

 70,000 

South Dakota—4.15%

2042

 

 30,000 

South Dakota—4.85%

2043

 

 50,000 

South Dakota—4.22%

2044

 

 30,000 

South Dakota—4.30%

2052

 

 20,000 

Other Long Term Debt:

 

 

 

Discount on Notes and Bonds and Debt Issuance Costs, Net

  

 

 (1,814)

Total Long-Term Debt

 

 

$ 552,186 

Less current maturities (including associated debt issuance costs)

 

 

 (63,991)

Total Long-Term Debt, Net of Current Maturities

 

 

$ 488,195 

 

Secured Debt

 

First Mortgage Bonds and Pollution Control Obligations

 

The South Dakota First Mortgage Bonds are a series of general obligation bonds issued under our South Dakota indenture. These bonds are secured by substantially all of our electric and natural gas assets associated with our South Dakota and Nebraska utility operations. The South Dakota indenture was transferred from NW Corp to NWE Public Service upon the completion of the holding company reorganization on January 1, 2024.

 

On March 28, 2024, we issued and sold $33.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.55 percent maturing on March 28, 2029, and $7.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.75 percent maturing on March 28, 2034. These bonds were issued in transactions exempt from the registration requirements of the Securities Act of 1933. Proceeds were used for general utility purposes. The bonds are secured by our electric and natural gas assets associated with its South Dakota and Nebraska utility operations.

 

As of December 31, 2024, we were in compliance with our financial debt covenants.

 

Maturities of Long-Term Debt

 

The aggregate minimum principal maturities of long-term debt during the next five years are $64.0 million in 2025, $105.0 million in 2026, $34 million in 2028, and 33.0 million in 2029.

 

 

 

(12)           Income Taxes

 

Income tax (benefit) expense is comprised of the following (in thousands):

 

Year Ended December 31,

 

2024

Federal

 

Current

$ (5,989)

Deferred

 (997)

Investment tax credits

  

State

 

Current

  

Deferred

 250 

Income Tax Benefit

$ (6,736)

Deferred income tax expense is comprised of the following (in thousands):

 

Year Ended December 31,

 

2024

Deferred tax benefit excluding items below

$ (2,934)

Adjustments to other noncurrent liabilities, regulatory assets, and liabilities

 (5,371)

Tax benefit allocated to other comprehensive income

 (134)

Adjustments to deferred income taxes for production tax credit cash transfer

 7,692 

Deferred tax benefit

$ (747)

 

Our effective tax rate typically differs from the federal statutory tax rate primarily due to production tax credits and the regulatory impact of flowing through the federal and state tax benefit of repairs deductions, state tax benefit of accelerated tax depreciation deductions (including bonus depreciation when applicable), and production tax credits. The regulatory accounting treatment of these deductions requires immediate income recognition for temporary tax differences of this type, which is referred to as the flow-through method. When the flow-through method of accounting for temporary differences is reflected in regulated revenues, we record deferred income taxes and establish related regulatory assets and liabilities.

 

The following table reconciles our effective income tax rate to the federal statutory rate:

 

Year Ended December 31,

 

2024

Federal statutory rate

 21.0 %

State income tax, net of federal provisions

 1.0 

Production tax credits

 (36.3) 

Flow-through repairs deductions

 (15.9) 

Gas repairs safe harbor method change

 (10.9) 

Amortization of excess deferred income taxes

 (1.9) 

Plant and depreciation of flow through items

 11.1 

Prior year permanent return to accrual adjustments

 0.8 

Other, net

 3.3 

Effective tax rate

 (27.8) %

 

The table below summarizes the significant differences in income tax expense (benefit) based on the differences between our effective tax rate and the federal statutory rate (in thousands). All of our income from continuing operations is from domestic operations.

 

Year Ended December 31, 2024

Income Before Income Taxes

$ 24,197 

 

 

Income tax calculated at federal statutory rate

 5,081 

 

 

Permanent or flow through adjustments:

 

State income, net of federal provisions

 250 

Production tax credits

 (8,781)

Flow-through repairs deductions

 (3,859)

Gas repairs safe harbor method change

 (2,628)

Amortization of excess deferred income taxes

 (465)

Plant and depreciation of flow through items

 2,675 

Prior year permanent return to accrual adjustments

 185 

Other, net

 806 

 

 (11,817)

 

 

Income Tax Benefit

$ (6,736)

 

We are included in NorthWestern Energy Group, Inc.'s consolidated federal and state income tax returns. In accordance with our tax sharing agreement with NorthWestern Energy Group, Inc., we compute our income taxes based upon the separate return method, where we are assumed to file a separate return with the taxing authority, thereby reporting our taxable income and paying the applicable tax to or receiving the appropriate refund from NorthWestern Energy Group, Inc.

 

In 2023, the Internal Revenue Service (IRS) issued a safe harbor method of accounting for the repair and maintenance of natural gas transmission and distribution property. For the year ending December 31, 2024, after completion of our impact analysis of the gas repairs safe harbor method change, we recorded an income tax benefit of approximately $2.6 million related to tax deductions for repair costs that were previously capitalized in the 2022 and prior tax years.

 

The components of the net deferred income tax liability recognized in our Balance Sheets are related to the following temporary differences (in thousands):

 

 

December 31,

 

2024

Production tax credit

$ 62,094 

NOL carryforward

 30,124 

Unbilled revenue

 3,350 

Environmental liability

 3,283 

Compensation accruals

 1,693 

Reserves and accruals

 119 

Other, net

 2,001 

Deferred Tax Asset

 102,664 

Excess tax depreciation

 (113,500)

Flow through depreciation

 (13,270)

Pension / postretirement benefits

 (1,291)

Regulatory assets and other

 (4,391)

Deferred Tax Liability

 (132,452)

Deferred Tax Liability, net

$ (29,788)

 

As of December 31, 2024, our total federal NOL carryforward was approximately $143.4 million. Our federal NOL carryforward does not expire. We believe it is more likely than not that sufficient taxable income will be generated to utilize these NOL carryforwards.

 

At December 31, 2024, our total production tax credit carryforward was approximately $62.1 million. If unused, our production tax credit carryforwards will expire as follows: $0.7 million in 2035, $7.5 million in 2036, $7.5 million in 2037, $7.0 million in 2038, $7.1 million in 2039, $7.7 million in 2040, $7.1 million in 2041, $8.7 million in 2042, and $8.8 million in 2044. We believe it is more likely than not that sufficient taxable income will be generated to utilize these production tax credit carryforwards.

 

Tax years 2021 and forward remain subject to examination by the IRS and state taxing authorities.

 

 

(13)           Comprehensive Income

 

The following tables display the components of Other Comprehensive Income, after-tax, and the related tax effects (in thousands):

 

December 31,

 

2024

 

Before-Tax Amount

 

Tax Benefit

 

Net-of-Tax Amount

Postretirement medical liability adjustment

$ 637 

 

$ (133)

 

$ 504 

Other comprehensive income

$ 637 

 

$ (133)

 

$ 504 

 

Balances by classification included within AOCI on the Balance Sheets are as follows, net of tax (in thousands):

 

December 31,

 

2024

Postretirement medical plans

$ 829 

Accumulated other comprehensive income

$ 829 

 

 

The following table displays the changes in AOCI by component, net of tax (in thousands):

 

 

 

December 31, 2024

 

Affected Line Item in the Statements of Income

 

Postretirement Medical Plans

Beginning balance

 

 

$  

Amounts reclassified from AOCI

Interest Expense

 

 504 

Net current-period other comprehensive income

 

 

 504 

Contribution from Parent

 

 

$ 325 

Ending Balance

 

 

$ 829 

 

 

 

 

 

 

 

(14)           Employee Benefit Plans

 

Pension and Other Postretirement Benefit Plans

 

We sponsor and/or contribute to pension and postretirement health care and life insurance benefit plans for eligible employees. The pension plan for our South Dakota and Nebraska employees is referred to as the NorthWestern Energy SD/NE Plan (formerly known as the NorthWestern Corporation Plan). We utilize a number of accounting mechanisms that reduce the volatility of reported pension costs. Differences between actuarial assumptions and actual plan results are deferred and are recognized into earnings only when the accumulated differences exceed 10 percent of the greater of the projected benefit obligation or the market-related value of plan assets. If necessary, the excess is amortized over the average remaining service period of active employees. The Plans' funded status is recognized as an asset in our Financial Statements. See Note 4 - Regulatory Assets and Liabilities, for further discussion on how these costs are recovered through rates charged to our customers.

 

Benefit Obligation and Funded Status

 

Following is a reconciliation of the changes in plan benefit obligations and fair value of plan assets, and a statement of the funded status (in thousands):

 

Pension Benefits

 

Other Postretirement Benefits

 

December 31,

 

December 31,

 

2024

 

2024

Change in benefit obligation:

 

 

 

Obligation at beginning of period

$ 46,662 

 

$ 3,110 

Service cost

 493 

 

 56 

Interest cost

 2,219 

 

 101 

Actuarial (gain)

 (1,719)

 

 (710)

Settlements

  

 

  

Benefits paid

 (4,511)

 

 (170)

Benefit Obligation at End of Period

$ 43,144 

 

$ 2,387 

Change in Fair Value of Plan Assets:

 

 

 

Fair value of plan assets at beginning of period

 54,537 

 

  

Return on plan assets

 1,385 

 

  

Employer contributions

 1,200 

 

 170 

Settlements

  

 

  

Benefits paid

 (4,511)

 

 (170)

Fair value of plan assets at end of period

$ 52,611 

 

$  

Funded Status

$ 9,467 

 

$ (2,387)

 

 

 

 

Amounts Recognized in the Balance Sheet Consist of:

 

 

 

Noncurrent asset

 9,467 

 

  

Total Assets

$ 9,467 

 

$  

Current liability

  

 

 (800)

Noncurrent liability

  

 

 (1,587)

Total Liabilities

  

 

 (2,387)

Net amount recognized

$ 9,467 

 

$ (2,387)

 

 

 

 

Amounts Recognized in Regulatory Assets Consist of:

 

 

 

Prior service credit

  

 

  

   Net actuarial (loss) gain

 (992)

 

  

Amounts recognized in AOCI consist of:

 

 

 

Prior service cost

  

 

  

Net actuarial gain

  

 

 1,228 

Total

$ (992)

 

$ 1,228 

 

The actuarial gain/loss is primarily due to the change in discount rate assumption and actual asset returns compared with expected amounts.

 

 

Net Periodic Cost (Credit)

 

The components of the net costs (credits) for our pension and other postretirement plans are as follows (in thousands):

 

 

Pension Benefits

 

Other Postretirement Benefits

 

December 31,

 

December 31,

 

2024

 

2024

Components of Net Periodic Benefit Cost

 

 

 

Service cost

$ 493 

 

$ 56 

Interest cost

 2,219 

 

 101 

Expected return on plan assets

 (2,740)

 

  

Amortization of prior service cost (credit)

  

 

  

Recognized actuarial loss (gain)

  

 

 (73)

Net Periodic Benefit Cost (Credit)

$ (28)

 

$ 84 

 

 

 

 

Previously deferred costs recognized(1)

 75 

 

  

Net Periodic Benefit Cost Recognized

$ 47 

 

$ 84 

 

 

 

 

 

 

 

 

(1) Net periodic benefit costs for pension and postretirement benefit plans are recognized for financial reporting based on the authorization of each regulatory jurisdiction in which we operate. A portion of these costs are recorded in regulatory assets and recognized in the Statements of Income as those costs are recovered through customer rates.

 

For the year ended December 31, 2024, Service costs were recorded in Operating, general, and administrative expense while non-service costs were recorded in Other income, net on the Statements of Income.

 

For purposes of calculating the expected return on pension plan assets, the market-related value of assets is used, which is based upon fair value. The difference between actual plan asset returns and estimated plan asset returns are amortized equally over a period not to exceed five years.

 

 

Actuarial Assumptions

 

The measurement dates used to determine pension and other postretirement benefit measurements for the plans are December 31, 2024. The actuarial assumptions used to compute net periodic pension cost and postretirement benefit cost are based upon information available as of the beginning of the year, specifically, market interest rates, past experience and management's best estimate of future economic conditions. Changes in these assumptions may impact future benefit costs and obligations. In computing future costs and obligations, we must make assumptions about such things as employee mortality and turnover, expected salary and wage increases, discount rate, expected return on plan assets, and expected future cost increases. Two of these assumptions have the most impact on the level of cost: (1) discount rate and (2) expected rate of return on plan assets. During 2022, the plan's actuary conducted an experience study to review five years of plan experience and update these assumptions.

 

On an annual basis, we set the discount rate using a yield curve analysis. This analysis includes constructing a hypothetical bond portfolio whose cash flow from coupons and maturities matches the year-by-year, projected benefit cash flow from our plans. The increase in the discount rate during 2024 decreased our projected benefit obligation by approximately $2 million.

 

In determining the expected long-term rate of return on plan assets, we review historical returns, the future expectations for returns for each asset class weighted by the target asset allocation of the pension and postretirement portfolios, and long-term inflation assumptions. Based on the target asset allocation for our pension assets and future expectations for asset returns, we decreased our long term rate of return on assets assumption for NorthWestern Energy SD/NE Pension Plan to 4.58 percent for 2025.

 

The weighted-average assumptions used in calculating the preceding information are as follows:

 

Pension Benefits

 

Other Postretirement Benefits

 

December 31,

 

December 31,

 

2024

 

2024

Discount rate

 5.50 

 

 5.30 

Expected rate of return on assets

 5.15 

 

N/A

Long-term rate of increase in compensation levels (non-union)

 4.00 

 

 4.00 

Long-term rate of increase in compensation levels (union)

 4.00 

 

 4.00 

Interest crediting rate

 3.30 

 

N/A

 

The postretirement benefit obligation is calculated assuming that health care costs increase by a 5.00 percent fixed rate. The company contribution toward the premium cost is capped, therefore future health care cost trend rates are expected to have a minimal impact on company costs and the accumulated postretirement benefit obligation.

 

Investment Strategy

 

Our investment goals with respect to managing the pension and other postretirement assets are to meet current and future benefit payment needs while maximizing total investment returns (income and appreciation) after inflation within the constraints of diversification, prudent risk taking, Prudent Man Rule of the Employee Retirement Income Security Act of 1974 and liability-based considerations. Each plan is diversified across asset classes to achieve optimal balance between risk and return and between income and growth through capital appreciation. Our investment philosophy is based on the following:

 

          Each plan should be substantially invested as long-term cash holdings reduce long-term rates of return;

          Pension Plan portfolio risk is described by volatility in the funded status of the Plans;

          It is prudent to diversify each plan across the major asset classes;

          Equity investments provide greater long-term returns than fixed income investments, although with greater short-term volatility;

          Fixed income investments of the plans should strongly correlate with the interest rate sensitivity of the plan’s aggregate liabilities in order to hedge the risk of change in interest rates negatively impacting the pension plans overall funded status, (such assets will be described as Liability Hedging Fixed Income assets);

          Allocation to foreign equities increases the portfolio diversification and thereby decreases portfolio risk while providing for the potential for enhanced long-term returns;

          Active management can reduce portfolio risk and potentially add value through security selection strategies;

          A portion of plan assets should be allocated to passive, indexed management funds to provide for greater diversification and lower cost; and

          It is appropriate to retain more than one investment manager, provided that such managers offer asset class or style diversification.

 

Investment risk is measured and monitored on an ongoing basis through quarterly investment portfolio reviews, annual liability measurements, and periodic asset/liability studies.

 

The most important component of an investment strategy is the portfolio asset mix, or the allocation between the various classes of securities available. The mix of assets is based on an optimization study that identifies asset allocation targets in order to achieve the maximum return for an acceptable level of risk, while minimizing the expected contributions and pension and postretirement expense. In the optimization study, assumptions are formulated about characteristics, such as expected asset class investment returns, volatility (risk), and correlation coefficients among the various asset classes, and making adjustments to reflect future conditions expected to prevail over the study period. Based on this, the target asset allocation established, within an allowable range of plus or minus 5 percent, is as follows:

 

 

NorthWestern Energy SD/NE Pension

 

 

December 31,

 

 

2024

Fixed income securities

 

 90.0 %

Opportunistic fixed income

 

 3.0 

Global equities

 

 7.0 

Private real estate

 

  

 

The actual allocation by plan is as follows:

 

 

NorthWestern Energy SD/NE Pension

 

 

December 31,

 

2024

Cash and cash equivalents

 

 0.8 %

Fixed income securities

 

 89.4 

Opportunistic fixed income

 

 2.9 

Global equities

 

 6.9 

Private real estate

 

  

 

 

 100.0 %

 

Generally, the asset mix will be rebalanced to the target mix as individual portfolios approach their minimum or maximum levels. The guidelines allow for a transition to targets over time as assets are reallocated to newly-approved asset classes of opportunistic fixed income and private real estate. Debt securities consist of U.S. and international instruments including emerging markets and high yield instruments, as well as government, corporate, asset backed and mortgage backed securities. While the portfolio may invest in high yield securities, the average quality must be rated at least “investment grade" by rating agencies. Equity, real estate and fixed income portfolios may be comprised of both active and passive management strategies. Performance of fixed income investments is measured by both traditional investment benchmarks as well as relative changes in the present value of the plan's liabilities. Equity investments consist primarily of U.S. stocks including large, mid and small cap stocks. We also invest in global equities with exposure to developing and emerging markets. Equity investments may also be diversified across investment styles such as growth and value. Derivatives, options and futures are permitted for the purpose of reducing risk but may not be used for speculative purposes. Real estate investments will consist of global equity or debt interests in tangible property consisting of land, buildings, and other improvements in commercial and residential sectors.

 

Our plan assets are primarily invested in common collective trusts (CCTs), which are invested in equity and fixed income securities. In accordance with our investment policy, these pooled investment funds must have an adequate asset base relative to their asset class and be invested in a diversified manner and have a minimum of three years of verified investment performance experience or verified portfolio manager investment experience in a particular investment strategy and have management and oversight by an investment advisor registered with the SEC. Investments in a collective investment vehicle are valued by multiplying the investee company’s net asset value per share with the number of units or shares owned at the valuation date. Net asset value per share is determined by the trustee. Investments held by the CCT, including collateral invested for securities on loan, are valued on the basis of valuations furnished by a pricing service approved by the CCT’s investment manager, which determines valuations using methods based on quoted closing market prices on national securities exchanges, or at fair value as determined in good faith by the CCT’s investment manager if applicable. The funds do not contain any redemption restrictions. The direct holding of NorthWestern Public Service's or any affiliate's stock is not permitted; however, any holding in a diversified mutual fund or collective investment fund is permitted.

 

Cash Flows

 

In accordance with the Pension Protection Act of 2006 (PPA), and the relief provisions of the Worker, Retiree, and Employer Recovery Act of 2008 (WRERA), we are required to meet minimum funding levels in order to avoid required contributions and benefit restrictions. We have elected to use asset smoothing provided by the WRERA, which allows the use of asset averaging, including expected returns (subject to certain limitations), for a 24-month period in the determination of funding requirements. Additional funding relief was passed in the American Rescue Plan Act of 2021, providing for longer amortization and interest rate smoothing, which we elected to use. We expect to continue to make contributions to the pension plans in 2024 and future years that reflect the minimum requirements and discretionary amounts consistent with the amounts recovered in rates. Additional legislative or regulatory measures, as well as fluctuations in financial market conditions, may impact our funding requirements.

 

Annual contributions to the pension plan are as follows (in thousands):

 

2024

NorthWestern Energy Pension Plan

 1,200 

 

$ 1,200 

 

We estimate the plans will make future benefit payments to participants as follows (in thousands):

 

Pension Benefits

 

Other Postretirement Benefits

2025

 3,974 

 

 790 

2026

 3,856 

 

 230 

2027

 3,785 

 

 219 

2028

 3,829 

 

 174 

2029

 4,191 

 

 180 

2030-2034

 19,165 

 

 929 

 

Defined Contribution Plan

 

Our defined contribution plan permits employees to defer receipt of compensation as provided in Section 401(k) of the Internal Revenue Code. Under the plan, employees may elect to direct a percentage of their gross compensation to the plan. We also contribute various percentages of employees' gross compensation to the plan. Company contributions for the year ended December 31, 2024 were $3.1 million.

 

(15)           Stock-Based Compensation

 

Our employees participate in the NorthWestern Energy Group, Inc. Amended and Restated Equity Compensation Plan (ECP), which includes restricted stock awards and performance share awards. Stock-based compensation expense is allocated to us based on the outstanding awards held by our employees and our allocation of labor costs. We account for our share-based compensation arrangements by recognizing compensation costs for all share-based awards over the respective service period for employee services received in exchange for an award of equity or equity-based compensation. The compensation cost is based on the fair value of the grant on the date it was awarded.

 

We recognized total stock-based compensation expense of $0.6 million, for the year ended December 31, 2024, and related income tax benefit of $(0.1) million for the year ended December 31, 2024.

 

 

 

(16)           Common Stock

 

We have 100 shares of common stock authorized with a $0.01 par value. We have 100 shares of common stock issued and outstanding.

 

Dividend Restrictions

 

Under various state regulatory agreements, debt agreements and the Federal Power Act, we have restrictions, including minimum equity ratios, that limit the amount of dividend distributions that can be made.

 

Our ability to pay dividends is limited by the terms of various debt agreements, pursuant to which, we are required to maintain a debt to capitalization ratio of no more than 0.65 to 1.00.

 

As of December 31, 2024, approximately $294.6 million of our net assets were available for the payment of dividends under our most restrictive dividend restriction.

 

 

 

(17)           Commitments and Contingencies

 

Long Term Supply and Capacity Purchase Obligations

 

We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these contracts are included in Fuel, purchased power and direct transmission expense in the Statements of Income and were approximately $100.6 million for the year ended December 31, 2024. As of December 31, 2024, our commitments under these contracts were $81.5 million in 2025, $53.0 million in 2026, $50.2 million in 2027, $50.4 million in 2028, $47.6 million in 2029, and $175.0 million thereafter. These commitments are not reflected in our Financial Statements.

 

ENVIRONMENTAL LIABILITIES AND REGULATION

 

Environmental Matters

 

The operation of electric generating, transmission and distribution facilities, and gas transportation and distribution facilities, along with the development (involving site selection, environmental assessments, and permitting) and construction of these assets, are subject to extensive federal, state, and local environmental and land use laws and regulations. Our activities involve compliance with diverse laws and regulations that address emissions and impacts to the environment, including air and water, protection of natural resources, avian and wildlife. We monitor federal, state, and local environmental initiatives to determine potential impacts on our financial results. As new laws or regulations are implemented, our policy is to assess their applicability and implement the necessary modifications to our facilities or their operation to maintain ongoing compliance.

 

Our environmental exposure includes a number of components, including remediation expenses related to the cleanup of current or former properties, and costs to comply with changing environmental regulations related to our operations. At present, our environmental reserve, which relates primarily to the remediation of former manufactured gas plant sites owned by us or for which we are responsible, is estimated to range between $12.8 million to $19.1 million. As of December 31, 2024, we had a reserve of approximately $15.7 million, which has not been discounted. Environmental costs are recorded when it is probable we are liable for the remediation and we can reasonably estimate the liability. We use a combination of site investigations and monitoring to formulate an estimate of environmental remediation costs for specific sites. Our monitoring procedures and development of actual remediation plans depend not only on site specific information but also on coordination with the different environmental regulatory agencies in our respective jurisdictions; therefore, while remediation exposure exists, it may be many years before costs are incurred.

 

The following summarizes the change in our environmental liability (in thousands):

 

December 31,

 

2024

Liability at January 1,

$ 16,848 

Deductions

 (1,846)

Charged to costs and expense

 633 

Liability at December 31,

$ 15,635 

 

We are permitted to recover the remediation costs related to certain environmental liabilities within rates. Over time, as costs become determinable, we may seek authorization to recover such costs in rates or seek insurance reimbursement as available and applicable; therefore, although we cannot guarantee regulatory recovery for all remediation costs, we do not expect these costs to have a material effect on our consolidated financial position or results of operations.

 

Manufactured Gas Plants - Approximately $15.4 million of our environmental reserve accrual is related to the following manufactured gas plants.

 

South Dakota - A formerly operated manufactured gas plant located in Aberdeen, South Dakota, has been identified on the Federal Comprehensive Environmental Response, Compensation, and Liability Information System list as contaminated with coal tar residue. We are currently conducting feasibility studies, implementing remedial actions pursuant to work plans approved by the South Dakota Department of Agriculture and Natural Resources, and conducting ongoing monitoring and operation and maintenance activities. As of December 31, 2024, the reserve for remediation costs at this site was approximately $7.2 million, and we estimate that approximately $2.1 million of this amount will be incurred through 2028. The SDPUC permits the recovery of these costs within rates.

 

Nebraska - We own sites in North Platte, Kearney, and Grand Island, Nebraska on which former manufactured gas facilities were located. We are currently working independently to fully characterize the nature and extent of potential impacts associated with these Nebraska sites. Our reserve estimate includes assumptions for site assessment and remedial action work. At present, we cannot determine with a reasonable degree of certainty the nature and timing of any risk-based remedial action at our Nebraska locations.

 

Global Climate Change - National and international actions have been initiated to address global climate change and the contribution of greenhouse gas (GHG) including, most significantly, carbon dioxide (CO2) and methane emissions from natural gas. These actions include legislative proposals, Executive, Congressional and EPA actions at the federal level, state level activity, investor activism and private party litigation relating to emissions. Coal-fired plants have come under particular scrutiny due to their level of emissions. We have joint ownership interests in three coal-fired electric generating plants, all of which are operated by other companies. We are responsible for our proportionate share of the capital and operating costs while being entitled to our proportionate share of the power generated.

 

EPA Rules - Congress has not passed any federal climate change legislation regarding GHG emissions from coal fired plants, and we cannot predict the timing or form of any potential legislation. Section 111(d) of the Clean Air Act (CAA) confers authority on EPA and the states to regulate emissions, including GHGs, from existing stationary sources. In April 2024, the EPA released final rules related to greenhouse gas (GHG) emission standards (GHG Rules) for existing coal-fired facilities and new coal and natural gas-fired facilities as well as final rules strengthening the MATS requirements (MATS Rules). In particular, the GHG rules will (i) strengthen the current New Source Performance Standards for newly built fossil fuel-fired stationary combustion turbines (generally natural gas-fired); (ii) establish emission guidelines for states to follow in limiting carbon pollution from existing fossil fuel-fired steam generating electric generating units (including coal, oil and natural gas-fired units); and (iii) establish emission guidelines for large, frequently used existing fossil fuel-fired stationary combustion turbines (generally natural gas-fired). The MATS Rules will strengthen emission limits for acid gases, mercury, and other hazardous air pollutants from new and existing electric generating units. Compliance with the rules will require expensive upgrades at Colstrip Units 3 and 4 with proposed compliance dates that may not be achievable and / or require technology that is unproven, resulting in significant impacts to costs of the facilities. The final MATS and GHG Rules require compliance as early as 2027 and 2032, respectively.

 

Previous efforts by the EPA were met with extensive litigation, and this time is no different. We, along with many other utilities, electric cooperatives, organizations, and states, have petitioned for judicial review of the GHG and MATS Rules with the U.S. Court of Appeals for the D.C. Circuit. The United States Supreme Court denied the multiple stay requests related to the MATS Rule and the GHG Rule. The litigation on the merits continues for both the MATS and GHG rules in the D.C. Circuit Court of Appeals, and decisions are expected in 2025 unless the EPA reconsiders the underlying rules. If the MATS Rules and GHG Rules are implemented, it would result in additional material compliance costs. We will continue working with federal and state regulatory authorities, other utilities, and stakeholders to seek relief from the MATS and GHG regulations that, in our view, disproportionately impact customers in our region.

 

These GHG Rules and MATS Rules as well as future additional environmental requirements - federal or state - could cause us to incur material costs of compliance, increase our costs of procuring electricity, decrease transmission revenue and impact cost recovery. Technology to efficiently capture, remove and/or sequester such GHG emissions or hazardous air pollutants may not be available within a timeframe consistent with the implementation of any such requirements.

 

Regional Haze Rules - In January 2017, the EPA published amendments to the requirements under the CAA for state plans for protection of visibility - regional haze rules. Among other things, these amendments revised the process and requirements for the state implementation plans and extended the due date for the next periodic comprehensive regional haze state implementation plan revisions from 2018 to 2021.

 

The states of North Dakota and South Dakota have developed and submitted to the EPA, for its approval, their respective State Implementation Plans (SIP) for Regional Haze compliance. While these states, among others, did not meet the EPA’s July 31, 2021 submission deadline, they were all submitted in 2022. The draft North Dakota SIP does not require any additional controls at the Coyote generating facility. Similarly, the draft South Dakota SIP does not require any additional controls at the Big Stone generating facility. Until these SIPs are finalized and approved by EPA, the potential remains that installation of additional emissions controls might be required at these facilities.

 

Jointly Owned Plants - We have joint ownership in generation plants located in South Dakota, North Dakota, and Iowa that are or may become subject to the various regulations discussed above that have been or may be issued or proposed.

 

Other - We continue to manage equipment containing polychlorinated biphenyl (PCB) oil in accordance with the EPA's Toxic Substance Control Act regulations. We will continue to use certain PCB-contaminated equipment for its remaining useful life and will, thereafter, dispose of the equipment according to pertinent regulations that govern the use and disposal of such equipment.

 

We routinely engage the services of a third-party environmental consulting firm to assist in performing a comprehensive evaluation of our environmental reserve. Based upon information available at this time, we believe that the current environmental reserve properly reflects our remediation exposure for the sites currently and previously owned by us. The portion of our environmental reserve applicable to site remediation may be subject to change as a result of the following uncertainties:

 

          We may not know all sites for which we are alleged or will be found to be responsible for remediation; and

          Absent performance of certain testing at sites where we have been identified as responsible for remediation, we cannot estimate with a reasonable degree of certainty the total costs of remediation.

 

LEGAL PROCEEDINGS

 

We are subject to various legal proceedings, governmental audits and claims that arise in the ordinary course of business. In our opinion, the amount of ultimate liability with respect to these other actions will not materially affect our financial position, results of operations, or cash flows.

 

 

(18)           Revenue from Contracts with Customers

 

 Accounting Policy

 

Our revenues are primarily from tariff based sales. We provide gas and/or electricity to customers under these tariffs without a defined contractual term (at-will). As the revenue from these arrangements is equivalent to the electricity or gas supplied and billed in that period (including estimated billings), there will not be a shift in the timing or pattern of revenue recognition for such sales. We have also completed the evaluation of our other revenue streams, including those tied to longer term contractual commitments. These revenue streams have performance obligations that are satisfied at a point in time, and do not have a shift in the timing or pattern of revenue recognition.

 

Customers are billed monthly on a cycle basis. To match revenues with associated expenses, we accrue unbilled revenues for electric and natural gas services delivered to customers, but not yet billed at month-end.

 

Nature of Goods and Services

 

We currently provide retail electric and natural gas services to two primary customer classes. Our largest customer class consists of residential customers, which include single private dwellings and individual apartments. Our commercial customers consist primarily of main street businesses.

 

Electric Segment - Our regulated electric utility business primarily provides generation, transmission, and distribution services to our customers. We recognize revenue when electricity is delivered to the customer. Payments on our tariff based sales are generally due in 20-30 days after the billing date.

 

Natural Gas Segment - Our regulated natural gas utility business primarily provides transmission and distribution services to our customers in our South Dakota and Nebraska jurisdictions. We recognize revenue when natural gas is delivered to the customer. Payments on our tariff based sales are generally due in 20-30 days after the billing date.

 

Disaggregation of Revenue

 

The following tables disaggregate our revenue for the twelve months ended by major source and customer class (in millions):

 

December 31, 2024

Electric

 

Natural Gas

 

Total

South Dakota

$ 70.0 

 

$ 26.9 

 

$ 96.9 

Nebraska

  

 

 21.2 

 

 21.2 

Residential

 70.0 

 

 48.1 

 

 118.1 

South Dakota

 111.8 

 

 18.1 

 

 129.9 

Nebraska

  

 

 11.4 

 

 11.4 

Commercial

 111.8 

 

 29.5 

 

 141.3 

Other

 3.3 

 

  

 

 3.3 

Total Retail Revenues

 185.1 

 

 77.6 

 

 262.7 

Regulatory Amortization

 3.8 

 

 4.4 

 

 8.2 

Wholesale and other

 1.6 

 

 7.0 

 

 8.6 

Total Revenues

$ 190.5 

 

$ 89.0 

 

$ 279.5 

 

 

 

 

 

 

(19)           Related Party Transactions and Shared Services

 

Our parent, NorthWestern Energy Group, Inc., is organized as a holding company. As part of a holding company we receive services and share costs with Northwestern Energy Group, Inc., and its other subsidiaries pursuant to an Intercompany Services Agreement (ISA) that became effective in 2023. The ISA was approved by the Montana Public Service Commission (MPSC), whom regulates NorthWestern Corporation, a direct and wholly-owned subsidiary of NorthWestern Energy Group, Inc. In accordance with the ISA, NorthWestern Corporation, which employs all or substantially all of the employees of NorthWestern Energy Group, Inc. and its subsidiaries, will provide all labor related services to us. Pursuant to the ISA, all rendered services are at cost. For the year ended December 31, 2024, the total cost of labor and benefits associated with the services provided to us by NorthWestern Corporation employees was $39.3 million.

 

Additionally, pursuant to the ISA, when utility-related operating, administrative, and general costs are attributable to more than one entity within the holding company structure and are unable to be direct charged (Shared OA&G Costs), these costs will be allocated amongst the entities pursuant to a Cost Allocation Manual. The nature of these Shared OA&G Costs includes operations supervision and engineering, energy supply marketing, networking communications, information technology, human resources, accounting, legal, and other such administrative costs.

 

Outstanding payables and receivables associated with related party transactions under the ISA are cash settled monthly.

 

 

 

 

 

 


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
STATEMENTS OF ACCUMULATED COMPREHENSIVE INCOME, COMPREHENSIVE INCOME, AND HEDGING ACTIVITIES
  1. Report in columns (b),(c),(d) and (e) the amounts of accumulated other comprehensive income items, on a net-of-tax basis, where appropriate.
  2. Report in columns (f) and (g) the amounts of other categories of other cash flow hedges.
  3. For each category of hedges that have been accounted for as "fair value hedges", report the accounts affected and the related amounts in a footnote.
  4. Report data on a year-to-date basis.
Line No.
Item
(a)
Unrealized Gains and Losses on Available-For-Sale Securities
(b)
Minimum Pension Liability Adjustment (net amount)
(c)
Foreign Currency Hedges
(d)
Other Adjustments
(e)
Other Cash Flow Hedges Interest Rate Swaps
(f)
Other Cash Flow Hedges [Specify]
(g)
Totals for each category of items recorded in Account 219
(h)
Net Income (Carried Forward from Page 116, Line 78)
(i)
Total Comprehensive Income
(j)
1
Balance of Account 219 at Beginning of Preceding Year
2
Preceding Quarter/Year to Date Reclassifications from Account 219 to Net Income
3
Preceding Quarter/Year to Date Changes in Fair Value
4
Total (lines 2 and 3)
5
Balance of Account 219 at End of Preceding Quarter/Year
0
0
6
Balance of Account 219 at Beginning of Current Year
0
0
7
Current Quarter/Year to Date Reclassifications from Account 219 to Net Income
829,241
829,241
8
Current Quarter/Year to Date Changes in Fair Value
9
Total (lines 7 and 8)
829,241
829,241
30,932,544
31,761,785
10
Balance of Account 219 at End of Current Quarter/Year
829,241
829,241


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
SUMMARY OF UTILITY PLANT AND ACCUMULATED PROVISIONS FOR DEPRECIATION. AMORTIZATION AND DEPLETION

Report in Column (c) the amount for electric function, in column (d) the amount for gas function, in column (e), (f), and (g) report other (specify) and in column (h) common function.

Line No.
Classification
(a)
Total Company For the Current Year/Quarter Ended
(b)
Electric
(c)
Gas
(d)
Other (Specify)
(e)
Other (Specify)
(f)
Other (Specify)
(g)
Common
(h)
1
UtilityPlantAbstract
UTILITY PLANT
2
UtilityPlantInServiceAbstract
In Service
3
UtilityPlantInServiceClassified
Plant in Service (Classified)
1,505,430,739
1,145,833,144
288,163,669
71,433,926
4
UtilityPlantInServicePropertyUnderCapitalLeases
Property Under Capital Leases
191,443
(b)
191,443
5
UtilityPlantInServicePlantPurchasedOrSold
Plant Purchased or Sold
6
UtilityPlantInServiceCompletedConstructionNotClassified
Completed Construction not Classified
7
UtilityPlantInServiceExperimentalPlantUnclassified
Experimental Plant Unclassified
8
UtilityPlantInServiceClassifiedAndUnclassified
Total (3 thru 7)
1,505,622,182
1,145,833,144
288,163,669
191,443
71,433,926
9
UtilityPlantLeasedToOthers
Leased to Others
10
UtilityPlantHeldForFutureUse
Held for Future Use
11
ConstructionWorkInProgress
Construction Work in Progress
30,637,674
20,094,096
8,554,876
1,988,702
12
UtilityPlantAcquisitionAdjustment
Acquisition Adjustments
30,009,842
30,009,842
0
0
13
UtilityPlantAndConstructionWorkInProgress
Total Utility Plant (8 thru 12)
1,566,269,698
1,195,937,082
296,718,545
191,443
73,422,628
14
AccumulatedProvisionForDepreciationAmortizationAndDepletionOfPlantUtility
Accumulated Provisions for Depreciation, Amortization, & Depletion
565,615,458
424,440,914
117,424,275
0
23,750,269
15
UtilityPlantNet
Net Utility Plant (13 less 14)
1,000,654,240
771,496,167
179,294,270
191,443
49,672,359
16
DetailOfAccumulatedProvisionsForDepreciationAmortizationAndDepletionAbstract
DETAIL OF ACCUMULATED PROVISIONS FOR DEPRECIATION, AMORTIZATION AND DEPLETION
17
AccumulatedProvisionForDepreciationAmortizationAndDepletionUtilityPlantInServiceAbstract
In Service:
18
DepreciationUtilityPlantInService
Depreciation
549,597,867
413,115,909
117,424,275
19,057,683
19
AmortizationAndDepletionOfProducingNaturalGasLandAndLandRightsutilityPlantInService
Amortization and Depletion of Producing Natural Gas Land and Land Rights
20
AmortizationOfUndergroundStorageLandAndLandRightsutilityPlantInService
Amortization of Underground Storage Land and Land Rights
21
AmortizationOfOtherUtilityPlantUtilityPlantInService
Amortization of Other Utility Plant
5,186,347
(a)
493,761
4,692,586
22
DepreciationAmortizationAndDepletionUtilityPlantInService
Total in Service (18 thru 21)
554,784,214
413,609,670
117,424,275
0
23,750,269
23
DepreciationAmortizationAndDepletionUtilityPlantLeasedToOthersAbstract
Leased to Others
24
DepreciationUtilityPlantLeasedToOthers
Depreciation
25
AmortizationAndDepletionUtilityPlantLeasedToOthers
Amortization and Depletion
26
DepreciationAmortizationAndDepletionUtilityPlantLeasedToOthers
Total Leased to Others (24 & 25)
27
DepreciationAndAmortizationUtilityPlantHeldForFutureUseAbstract
Held for Future Use
28
DepreciationUtilityPlantHeldForFutureUse
Depreciation
29
AmortizationUtilityPlantHeldForFutureUse
Amortization
30
DepreciationAndAmortizationUtilityPlantHeldForFutureUse
Total Held for Future Use (28 & 29)
31
AbandonmentOfLeases
Abandonment of Leases (Natural Gas)
32
AmortizationOfPlantAcquisitionAdjustment
Amortization of Plant Acquisition Adjustment
10,831,245
10,831,243
0
33
AccumulatedProvisionForDepreciationAmortizationAndDepletionOfPlantUtility
Total Accum Prov (equals 14) (22,26,30,31,32)
565,615,458
424,440,914
117,424,275
0
23,750,269


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: AmortizationOfOtherUtilityPlantUtilityPlantInService

Amortization of Other South Dakota Electric Plant was $270,599 for 2023.

(b) Concept: UtilityPlantInServicePropertyUnderCapitalLeases

This column represents our right of use (operating lease) assets.


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
NUCLEAR FUEL MATERIALS (Account 120.1 through 120.6 and 157)
  1. Report below the costs incurred for nuclear fuel materials in process of fabrication, on hand, in reactor, and in cooling; owned by the respondent.
  2. If the nuclear fuel stock is obtained under leasing arrangements, attach a statement showing the amount of nuclear fuel leased, the quantity used and quantity on hand, and the costs incurred under such leasing arrangements.
Line No.
Description of item
(a)
Balance Beginning of Year
(b)
Changes during Year Additions
(c)
Changes during Year Amortization
(d)
Changes during Year Other Reductions (Explain in a footnote)
(e)
Balance End of Year
(f)
1
Nuclear Fuel in process of Refinement, Conv, Enrichment & Fab (120.1)
2
Fabrication
3
Nuclear Materials
4
Allowance for Funds Used during Construction
5
(Other Overhead Construction Costs, provide details in footnote)
6
SUBTOTAL (Total 2 thru 5)
7
Nuclear Fuel Materials and Assemblies
8
In Stock (120.2)
9
In Reactor (120.3)
10
SUBTOTAL (Total 8 & 9)
11
Spent Nuclear Fuel (120.4)
12
Nuclear Fuel Under Capital Leases (120.6)
13
(Less) Accum Prov for Amortization of Nuclear Fuel Assem (120.5)
14
TOTAL Nuclear Fuel Stock (Total 6, 10, 11, 12, less 13)
15
Estimated Net Salvage Value of Nuclear Materials in Line 9
16
Estimated Net Salvage Value of Nuclear Materials in Line 11
17
Est Net Salvage Value of Nuclear Materials in Chemical Processing
18
Nuclear Materials held for Sale (157)
19
Uranium
20
Plutonium
21
Other (Provide details in footnote)
22
TOTAL Nuclear Materials held for Sale (Total 19, 20, and 21)


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
ELECTRIC PLANT IN SERVICE (Account 101, 102, 103 and 106)
  1. Report below the original cost of electric plant in service according to the prescribed accounts.
  2. In addition to Account 101, Electric Plant in Service (Classified), this page and the next include Account 102, Electric Plant Purchased or Sold; Account 103, Experimental Electric Plant Unclassified; and Account 106, Completed Construction Not Classified-Electric.
  3. Include in column (c) or (d), as appropriate, corrections of additions and retirements for the current or preceding year.
  4. For revisions to the amount of initial asset retirement costs capitalized, included by primary plant account, increases in column (c) additions and reductions in column (e) adjustments.
  5. Enclose in parentheses credit adjustments of plant accounts to indicate the negative effect of such accounts.
  6. Classify Account 106 according to prescribed accounts, on an estimated basis if necessary, and include the entries in column (c). Also to be included in column (c) are entries for reversals of tentative distributions of the prior year reported in column (b). Likewise, if the respondent has a significant amount of plant retirements which have not been classified to primary accounts at the end of the year, include in column (d) a tentative distribution of such retirements, on an estimated basis, with appropriate contra entry to the account for accumulated depreciation provision. Include also in column (d) distributions of these tentative classifications in columns (c) and (d), including the reversals of the prior years tentative account distributions of these amounts. Careful observance of the above instructions and the texts of Accounts 101 and 106 will avoid serious omissions of the reported amount of respondent’s plant actually in service at end of year.
  7. Show in column (f) reclassifications or transfers within utility plant accounts. Include also in column (f) the additions or reductions of primary account classifications arising from distribution of amounts initially recorded in Account 102, include in column (e) the amounts with respect to accumulated provision for depreciation, acquisition adjustments, etc., and show in column (f) only the offset to the debits or credits distributed in column (f) to primary account classifications.
  8. For Account 399, state the nature and use of plant included in this account and if substantial in amount submit a supplementary statement showing subaccount classification of such plant conforming to the requirement of these pages.
  9. For each amount comprising the reported balance and changes in Account 102, state the property purchased or sold, name of vendor or purchase, and date of transaction. If proposed journal entries have been filed with the Commission as required by the Uniform System of Accounts, give also date.
Line No.
Account
(a)
Balance Beginning of Year
(b)
Additions
(c)
Retirements
(d)
Adjustments
(e)
Transfers
(f)
Balance at End of Year
(g)
1
1. INTANGIBLE PLANT
2
(301) Organization
3
(302) Franchise and Consents
4
(303) Miscellaneous Intangible Plant
0
530,715
0
(a)
1,965,340
112,966
2,609,021
5
TOTAL Intangible Plant (Enter Total of lines 2, 3, and 4)
0
530,715
0
1,965,340
112,966
2,609,021
6
2. PRODUCTION PLANT
7
A. Steam Production Plant
8
(310) Land and Land Rights
0
0
0
366,511
0
366,511
9
(311) Structures and Improvements
0
799,479
127,325
27,741,805
4,855
28,409,104
10
(312) Boiler Plant Equipment
0
1,946,275
430,226
201,277,663
7,591
202,801,303
11
(313) Engines and Engine-Driven Generators
0
0
0
0
0
0
12
(314) Turbogenerator Units
0
1,298.55
385,284
27,642,499
0
27,255,916
13
(315) Accessory Electric Equipment
0
118,774.53
16,192
13,144,728
0
13,247,310
14
(316) Misc. Power Plant Equipment
0
139,035
72,723
3,284,484
2,736
3,348,059
15
(317) Asset Retirement Costs for Steam Production
0
0
0
2,023,902
0
2,023,902
16
TOTAL Steam Production Plant (Enter Total of lines 8 thru 15)
0
3,002,264
1,031,751
275,481,592
277,452,105
17
B. Nuclear Production Plant
18
(320) Land and Land Rights
19
(321) Structures and Improvements
20
(322) Reactor Plant Equipment
21
(323) Turbogenerator Units
22
(324) Accessory Electric Equipment
23
(325) Misc. Power Plant Equipment
24
(326) Asset Retirement Costs for Nuclear Production
25
TOTAL Nuclear Production Plant (Enter Total of lines 18 thru 24)
26
C. Hydraulic Production Plant
27
(330) Land and Land Rights
0
28
(331) Structures and Improvements
0
29
(332) Reservoirs, Dams, and Waterways
0
30
(333) Water Wheels, Turbines, and Generators
0
31
(334) Accessory Electric Equipment
0
32
(335) Misc. Power Plant Equipment
0
33
(336) Roads, Railroads, and Bridges
0
34
(337) Asset Retirement Costs for Hydraulic Production
0
35
TOTAL Hydraulic Production Plant (Enter Total of lines 27 thru 34)
36
D. Other Production Plant
37
(340) Land and Land Rights
0
0
0
261,179
0
261,179
38
(341) Structures and Improvements
0
14,566,156
0
26,183,868
0
40,750,024
39
(342) Fuel Holders, Products, and Accessories
0
1,198,560
0
5,283,753
0
6,482,313
40
(343) Prime Movers
0
46,082,893
0
127,482,378
0
81,399,485
41
(344) Generators
0
1,795,827
0
87,862,628
0
89,658,455
42
(345) Accessory Electric Equipment
0
26,308,872
0
7,860,833
0
34,169,705
43
(346) Misc. Power Plant Equipment
0
2,257,821
0
22,614,998
0
24,872,819
44
(347) Asset Retirement Costs for Other Production
0
0
0
1,351,541
0
1,351,541
44.1
(348) Energy Storage Equipment - Production
45
TOTAL Other Prod. Plant (Enter Total of lines 37 thru 44)
0
44,343
0
278,901,178
0
278,945,521
46
TOTAL Prod. Plant (Enter Total of lines 16, 25, 35, and 45)
0
3,046,608
1,031,751
554,382,770
556,397,626
47
3. Transmission Plant
48
(350) Land and Land Rights
0
1,025
0
1,873,380
0
1,874,405
48.1
(351) Energy Storage Equipment - Transmission
49
(352) Structures and Improvements
0
37,925
0
13,539,689
0
13,577,614
50
(353) Station Equipment
0
4,223,463
619,821
109,647,684
438,189
112,813,137
51
(354) Towers and Fixtures
0
0
0
0
0
0
52
(355) Poles and Fixtures
0
2,146,360
75,087
63,569,430
0
65,640,703
53
(356) Overhead Conductors and Devices
0
731,345
0
33,574,139
0
34,305,484
54
(357) Underground Conduit
0
0
0
640,802
0
640,802
55
(358) Underground Conductors and Devices
0
0
0
4,707,009
0
4,707,009
56
(359) Roads and Trails
0
0
0
0
0
57
(359.1) Asset Retirement Costs for Transmission Plant
58
TOTAL Transmission Plant (Enter Total of lines 48 thru 57)
0
7,140,118
694,908
227,552,133
438,189
233,559,154
59
4. Distribution Plant
60
(360) Land and Land Rights
0
0
0
639,546
0
639,546
61
(361) Structures and Improvements
0
0
0
1,532,775
0
1,532,775
62
(362) Station Equipment
0
1,392,432
101,380
49,012,947
438,189
50,742,187
63
(363) Energy Storage Equipment – Distribution
0
0
0
0
0
0
64
(364) Poles, Towers, and Fixtures
0
3,633,337
1,014,699
61,524,411
0
64,143,049
65
(365) Overhead Conductors and Devices
0
1,435,578
867,429
23,628,715
0
24,196,864
66
(366) Underground Conduit
0
1,300,770
0
11,752,160
0
13,052,930
67
(367) Underground Conductors and Devices
0
6,078,680
397,838
65,951,874
0
71,632,716
68
(368) Line Transformers
0
1,982,930
0
46,127,333
0
48,110,263
69
(369) Services
0
1,339,530
169,759
23,491,077
0
24,660,848
70
(370) Meters
0
897,903
90,645
14,732,735
0
15,539,993
71
(371) Installations on Customer Premises
0
24,263
16,446
735,361
0
743,177
72
(372) Leased Property on Customer Premises
0
0
0
0
0
0
73
(373) Street Lighting and Signal Systems
0
2,847,174
74,040
10,910,313
0
13,683,447
74
(374) Asset Retirement Costs for Distribution Plant
0
0
0
0
0
0
75
TOTAL Distribution Plant (Enter Total of lines 60 thru 74)
0
20,932,596
2,732,237
310,039,247
438,189
328,677,795
76
5. REGIONAL TRANSMISSION AND MARKET OPERATION PLANT
77
(380) Land and Land Rights
78
(381) Structures and Improvements
79
(382) Computer Hardware
80
(383) Computer Software
81
(384) Communication Equipment
82
(385) Miscellaneous Regional Transmission and Market Operation Plant
83
(386) Asset Retirement Costs for Regional Transmission and Market Oper
84
TOTAL Transmission and Market Operation Plant (Total lines 77 thru 83)
85
6. General Plant
86
(389) Land and Land Rights
0
0
0
105,508
0
105,508
87
(390) Structures and Improvements
0
20,426
0
1,835,049
0
1,855,475
88
(391) Office Furniture and Equipment
0
4,566
0
85,089
1,364
91,019
89
(392) Transportation Equipment
0
255,944
727,042
17,283,520
0
16,812,422
90
(393) Stores Equipment
0
36,060
0
36,060
0
0
91
(394) Tools, Shop and Garage Equipment
0
134,005
143,901
2,091,100
0
2,081,204
92
(395) Laboratory Equipment
0
0
0
0
0
0
93
(396) Power Operated Equipment
0
0
0
938,987
0
938,987
94
(397) Communication Equipment
0
25,319
0
2,679,613
0
2,704,932
95
(398) Miscellaneous Equipment
0
0
0
0
0
0
96
SUBTOTAL (Enter Total of lines 86 thru 95)
0
404,200
870,943
25,054,926
1,364
24,589,548
97
(399) Other Tangible Property
0
0
0
0
0
0
98
(399.1) Asset Retirement Costs for General Plant
99
TOTAL General Plant (Enter Total of lines 96, 97, and 98)
0
404,200
870,943
25,054,926
1,364
24,589,547
100
TOTAL (Accounts 101 and 106)
0
32,054,237
5,329,839
1,118,994,416
114,330
1,145,833,144
101
(102) Electric Plant Purchased (See Instr. 8)
0
0
0
0
102
(Less) (102) Electric Plant Sold (See Instr. 8)
0
0
0
0
103
(103) Experimental Plant Unclassified
0
0
0
0
104
TOTAL Electric Plant in Service (Enter Total of lines 100 thru 103)
0
32,054,237
5,329,839
1,118,994,416
114,330
1,145,833,144


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: MiscellaneousIntangiblePlantAdjustments

This column represents the balances transfered to NorthWestern Energy Public Service Corporation on January 1, 2024, from NorthWestern Corporation as part of effectuating the holding company reorganization.


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
ELECTRIC PLANT LEASED TO OTHERS (Account 104)
Line No.
LesseeName
Name of Lessee
(a)
IndicationOfAssociatedCompany
* (Designation of Associated Company)
(b)
LeaseDescription
Description of Property Leased
(c)
CommissionAuthorization
Commission Authorization
(d)
ExpirationDateOfLease
Expiration Date of Lease
(e)
ElectricPlantLeasedToOthers
Balance at End of Year
(f)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
ELECTRIC PLANT HELD FOR FUTURE USE (Account 105)
  1. Report separately each property held for future use at end of the year having an original cost of $250,000 or more. Group other items of property held for future use.
  2. For property having an original cost of $250,000 or more previously used in utility operations, now held for future use, give in column (a), in addition to other required information, the date that utility use of such property was discontinued, and the date the original cost was transferred to Account 105.
Line No.
ElectricPlantHeldForFutureUseDescription
Description and Location of Property
(a)
ElectricPlantPropertyClassifiedAsHeldForFutureUseOriginalDate
Date Originally Included in This Account
(b)
ElectricPlantPropertyClassifiedAsHeldForFutureUseExpectedUseInServiceDate
Date Expected to be used in Utility Service
(c)
ElectricPlantHeldForFutureUse
Balance at End of Year
(d)
1 Land and Rights:
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21 Other Property:
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47 TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
CONSTRUCTION WORK IN PROGRESS - - ELECTRIC (Account 107)
  1. Report below descriptions and balances at end of year of projects in process of construction (107).
  2. Show items relating to "research, development, and demonstration" projects last, under a caption Research, Development, and Demonstrating (see Account 107 of the Uniform System of Accounts).
  3. Minor projects (5% of the Balance End of the Year for Account 107 or $1,000,000, whichever is less) may be grouped.
Line No.
ConstructionWorkInProgressProjectDescription
Description of Project
(a)
ConstructionWorkInProgress
Construction work in progress - Electric (Account 107)
(b)
1
Minor Projects (Less than $1,000,000 - 159)
9,262,551
2
Faulton 34.5 KV
1,057,256
3
Aberdeen Generating Station
9,774,289
43
Total
20,094,096


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
ACCUMULATED PROVISION FOR DEPRECIATION OF ELECTRIC UTILITY PLANT (Account 108)
  1. Explain in a footnote any important adjustments during year.
  2. Explain in a footnote any difference between the amount for book cost of plant retired, Line 12, column (c), and that reported for electric plant in service, page 204, column (d), excluding retirements of non-depreciable property.
  3. The provisions of Account 108 in the Uniform System of Accounts require that retirements of depreciable plant be recorded when such plant is removed from service. If the respondent has a significant amount of plant retired at year end which has not been recorded and/or classified to the various reserve functional classifications, make preliminary closing entries to tentatively functionalize the book cost of the plant retired. In addition, include all costs included in retirement work in progress at year end in the appropriate functional classifications.
  4. Show separately interest credits under a sinking fund or similar method of depreciation accounting.
Line No.
Item
(a)
Total (c + d + e)
(b)
Electric Plant in Service
(c)
Electric Plant Held for Future Use
(d)
Electric Plant Leased To Others
(e)
Section A. Balances and Changes During Year
1
AccumulatedProvisionForDepreciationOfElectricUtilityPlant
Balance Beginning of Year
0
2
Depreciation Provisions for Year, Charged to
3
DepreciationExpenseExcludingAdjustments
(403) Depreciation Expense
36,666,921
36,666,921
4
DepreciationExpenseForAssetRetirementCosts
(403.1) Depreciation Expense for Asset Retirement Costs
0
0
5
ExpensesOfElectricPlantLeasedToOthers
(413) Exp. of Elec. Plt. Leas. to Others
0
0
6
TransportationExpensesClearing
Transportation Expenses-Clearing
0
0
7
OtherClearingAccounts
Other Clearing Accounts
0
0
8
OtherAccounts
Other Accounts (Specify, details in footnote):
(b)
383,807,983
383,807,983
9.1
9.2
9.3
9.4
9.5
10
DepreciationProvision
TOTAL Deprec. Prov for Year (Enter Total of lines 3 thru 9)
420,474,905
420,474,905
11
Net Charges for Plant Retired:
12
BookCostOfRetiredPlant
Book Cost of Plant Retired
5,329,839
5,329,839
13
CostOfRemovalOfPlant
Cost of Removal
2,280,291
2,280,291
14
SalvageValueOfRetiredPlant
Salvage (Credit)
264,783
264,783
15
NetChargesForRetiredPlant
TOTAL Net Chrgs. for Plant Ret. (Enter Total of lines 12 thru 14)
7,345,347
7,345,347
16
OtherAdjustmentsToAccumulatedDepreciation
Other Debit or Cr. Items (Describe, details in footnote):
13,649
13,649
17.1
17.2
17.3
17.4
17.5
18
BookCostOfAssetRetirementCosts
Book Cost or Asset Retirement Costs Retired
19
AccumulatedProvisionForDepreciationOfElectricUtilityPlant
Balance End of Year (Enter Totals of lines 1, 10, 15, 16, and 18)
413,115,909
413,115,909
Section B. Balances at End of Year According to Functional Classification
20
AccumulatedDepreciationSteamProduction
Steam Production
128,470,895
128,470,895
21
AccumulatedDepreciationNuclearProduction
Nuclear Production
0
0
22
AccumulatedDepreciationHydraulicProductionConventional
Hydraulic Production-Conventional
0
0
23
AccumulatedDepreciationHydraulicProductionPumpedStorage
Hydraulic Production-Pumped Storage
0
0
24
AccumulatedDepreciationOtherProduction
Other Production
68,848,410
68,848,410
25
AccumulatedDepreciationTransmission
Transmission
91,052,316
91,052,316
26
AccumulatedDepreciationDistribution
Distribution
114,665,107
114,665,107
27
AccumulatedDepreciationRegionalTransmissionAndMarketOperation
Regional Transmission and Market Operation
0
0
28
AccumulatedDepreciationGeneral
General
10,079,181
10,079,181
29
AccumulatedProvisionForDepreciationOfElectricUtilityPlant
TOTAL (Enter Total of lines 20 thru 28)
413,115,909
413,115,909


FOOTNOTE DATA

(a) Concept: AccumulatedProvisionForDepreciationOfElectricUtilityPlant

Section A.  Balances and Changes During Year 2023 SOUTH DAKOTA DATA ONLY

Line No.

Item

Total   (c+d+e)

Electric Plant in Service Accum Dep

 

(a)

(b)

(c)

1

Balance Beginning of Year

           360,893,629

                 360,893,629

2

Depreciation Provisions for Year, Charged to

   

3

(403) Depreciation Expense

             32,111,914

                   32,111,914

4

(403.1) Depreciation Expense for Asset Retirement Costs

   

5

(413) Exp. of Elec. Plt. Leas. to Others

   

6

Transportation Expenses-Clearing

   

7

Other Clearing Accounts

   

8

Other Accounts (Specify, details in footnote):

   

9

     

10

TOTAL Deprec. Prov for Year (Enter Total of lines 3 thru 9)

             32,111,914

                   32,111,914

11

Net Charges for Plant Retired:

   

12

Book Cost of Plant Retired

               8,149,439

                     8,149,439

13

Cost of Removal

               1,495,135

                     1,495,135

14

Salvage (Credit)

                  217,843

                        217,843

15

TOTAL Net Chrgs. for Plant Ret. (Enter Total of lines 12 thru 14)

               9,426,731

                     9,426,731

16

Other Debit or Cr. Items (Describe, details in footnote):

   

17

     

18

Book Cost or Asset Retirement Costs Retired

   

19

Balance End of Year (Enter Totals of lines 1, 10, 15, 16, and 18)

           383,578,812

                 383,578,812

Section B.  Balances at End of Year According to Functional Classification

20

Steam Production

           121,096,511

                 121,096,511

21

Nuclear Production

                              -  

                                    -  

22

Hydraulic Production-Conventional

                              -  

                                    -  

23

Hydraulic Production-Pumped Storage

                              -  

                                    -  

24

Other Production

             61,312,774

                   61,312,774

25

Transmission

             85,072,160

                   85,072,160

26

Distribution

           105,498,857

                 105,498,857

27

General

             10,598,510

                   10,598,510

28

TOTAL (Enter Total of lines 20 thru 27)

           383,578,812

                 383,578,812

(b) Concept: OtherAccounts

Transfer from NorthWestern Corporation on January 1, 2024, as part of effectuating the holding company reorganization.


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
INVESTMENTS IN SUBSIDIARY COMPANIES (Account 123.1)
  1. Report below investments in Account 123.1, Investments in Subsidiary Companies.
  2. Provide a subheading for each company and list thereunder the information called for below. Sub-TOTAL by company and give a TOTAL in columns (e), (f), (g) and (h). (a) Investment in Securities - List and describe each security owned. For bonds give also principal amount, date of issue, maturity, and interest rate. (b) Investment Advances - Report separately the amounts of loans or investment advances which are subject to repayment, but which are not subject to current settlement. With respect to each advance show whether the advance is a note or open account. List each note giving date of issuance, maturity date, and specifying whether note is a renewal.
  3. Report separately the equity in undistributed subsidiary earnings since acquisition. The TOTAL in column (e) should equal the amount entered for Account 418.1.
  4. For any securities, notes, or accounts that were pledged designate such securities, notes, or accounts in a footnote, and state the name of pledgee and purpose of the pledge.
  5. If Commission approval was required for any advance made or security acquired, designate such fact in a footnote and give name of Commission, date of authorization, and case or docket number.
  6. Report column (f) interest and dividend revenues from investments, including such revenues from securities disposed of during the year.
  7. In column (h) report for each investment disposed of during the year, the gain or loss represented by the difference between cost of the investment (or the other amount at which carried in the books of account if different from cost) and the selling price thereof, not including interest adjustment includible in column (f).
  8. Report on Line 42, column (a) the TOTAL cost of Account 123.1.
Line No.
DescriptionOfInvestmentsInSubsidiaryCompanies
Description of Investment
(a)
DateOfAcquisitionInvestmentsInSubsidiaryCompanies
Date Acquired
(b)
DateOfMaturityInvestmentsInSubsidiaryCompanies
Date of Maturity
(c)
InvestmentInSubsidiaryCompanies
Amount of Investment at Beginning of Year
(d)
EquityInEarningsOfSubsidiaryCompanies
Equity in Subsidiary Earnings of Year
(e)
InterestAndDividendRevenueFromInvestments
Revenues for Year
(f)
InvestmentInSubsidiaryCompanies
Amount of Investment at End of Year
(g)
InvestmentGainLossOnDisplosal
Gain or Loss from Investment Disposed of
(h)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
Total Cost of Account 123.1 $
Total


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
MATERIALS AND SUPPLIES
  1. For Account 154, report the amount of plant materials and operating supplies under the primary functional classifications as indicated in column (a); estimates of amounts by function are acceptable. In column (d), designate the department or departments which use the class of material.
  2. Give an explanation of important inventory adjustments during the year (in a footnote) showing general classes of material and supplies and the various accounts (operating expenses, clearing accounts, plant, etc.) affected debited or credited. Show separately debit or credits to stores expense clearing, if applicable.
Line No.
Account
(a)
Balance Beginning of Year
(b)
Balance End of Year
(c)
Department or Departments which Use Material
(d)
1
Fuel Stock (Account 151)
7,701,524
Electric & Gas
2
Fuel Stock Expenses Undistributed (Account 152)
3
Residuals and Extracted Products (Account 153)
4
Plant Materials and Operating Supplies (Account 154)
5
Assigned to - Construction (Estimated)
21,961,870
6
Assigned to - Operations and Maintenance
7
Production Plant (Estimated)
473,626
Electric & Gas
8
Transmission Plant (Estimated)
272,069
Electric & Gas
9
Distribution Plant (Estimated)
553,950
Electric & Gas
10
Regional Transmission and Market Operation Plant (Estimated)
0
11
Assigned to - Other (provide details in footnote)
12
TOTAL Account 154 (Enter Total of lines 5 thru 11)
23,261,515
13
Merchandise (Account 155)
14
Other Materials and Supplies (Account 156)
15
Nuclear Materials Held for Sale (Account 157) (Not applic to Gas Util)
16
Stores Expense Undistributed (Account 163)
17
18
19
20
TOTAL Materials and Supplies
(a)
30,963,039


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: MaterialsAndOperatingSupplies

 

 

Line
No.

Account


(a)

Balance
Beginning of Year

(b)

Balance
End of Year

(c)

Estimate of Portion Attributable to Construction

Balance
End of Year w/ Assigned to Construction

(c )

Deparment or
Departments which
Use Material
(d)

1

Fuel Stock (Account 151)

    7,555,607.60

    7,701,524.00

 

    7,701,524.00

Electric & Gas

2

Fuel Stock Expense Undistributed (Account 152)

 

 

 

 

 

3

Residuals and Extracted Products (Account 153)

 

 

 

 

 

4

Plant Materials and Operating Supplies (Account 154)

 

 

 

 

 

5

Assigned to - Construction (Estimated)

                      -  

                      -  

  21,961,870.00

  21,961,870.00

Electric & Gas

6

Assigned to - Operatons and Maintenance

 

 

 

 

 

7

Production Plant (Estimated)

    6,344,761.56

    8,477,126.00

  (8,003,500.00)

       473,626.00

Electric & Gas

8

Transmission Plant (Estimated)

    4,227,087.33

    4,869,591.00

  (4,597,522.00)

       272,069.00

Electric & Gas

9

Distribution Plant (Estimated)

    8,883,490.96

    9,914,798.00

  (9,360,848.00)

       553,950.00

Electric & Gas

10

Regional Transmission and Market Operation Plant (Estimated)

                      -  

                      -  

 

 

 

11

Assigned to - Other

 

 

 

                      -  

Common

12

TOTAL Account 154 (Enter Total of lines 5 thru 10)

  19,455,339.85

  23,261,515.00

                      -  

  23,261,515.00

 

13

Merchandise (Account 155)

                      -  

                      -  

 

 

 

14

Other Materials and Supplies (Account 156)

 

 

 

 

Electric & Gas

15

Nuclear Materials Held for Sale (Account 157)

                      -  

                      -  

 

 

 

16

Store Expense Undistributed (Account 163)

 

 

 

 

Electric & Gas

17

 

 

 

 

 

 

18

 

 

 

 

 

 

19

 

 

 

 

 

 

20

TOTAL Materials and Supplies (Per Balance Sheet)

  27,010,947.45

  30,963,039.00

                      -  

  30,963,039.00

 


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
Allowances (Accounts 158.1 and 158.2)
  1. Report below the particulars (details) called for concerning allowances.
  2. Report all acquisitions of allowances at cost.
  3. Report allowances in accordance with a weighted average cost allocation method and other accounting as prescribed by General Instruction No. 21 in the Uniform System of Accounts.
  4. Report the allowances transactions by the period they are first eligible for use: the current year’s allowances in columns (b)-(c), allowances for the three succeeding years in columns (d)-(i), starting with the following year, and allowances for the remaining succeeding years in columns (j)-(k).
  5. Report on Line 4 the Environmental Protection Agency (EPA) issued allowances. Report withheld portions Lines 36-40.
  6. Report on Line 5 allowances returned by the EPA. Report on Line 39 the EPA’s sales of the withheld allowances. Report on Lines 43-46 the net sales proceeds and gains/losses resulting from the EPA’s sale or auction of the withheld allowances.
  7. Report on Lines 8-14 the names of vendors/transferors of allowances acquired and identify associated companies (See "associated company" under "Definitions" in the Uniform System of Accounts).
  8. Report on Lines 22 - 27 the name of purchasers/ transferees of allowances disposed of and identify associated companies.
  9. Report the net costs and benefits of hedging transactions on a separate line under purchases/transfers and sales/transfers.
  10. Report on Lines 32-35 and 43-46 the net sales proceeds and gains or losses from allowance sales.
Current Year Year One Year Two Year Three Future Years Totals
Line No.
SO2 Allowances Inventory (Account 158.1)
(a)
No.
(b)
Amt.
(c)
No.
(d)
Amt.
(e)
No.
(f)
Amt.
(g)
No.
(h)
Amt.
(i)
No.
(j)
Amt.
(k)
No.
(l)
Amt.
(m)
1
Balance-Beginning of Year
2
3
Acquired During Year:
4
Issued (Less Withheld Allow)
5
Returned by EPA
6
7
8
9
10
11
12
13
14
15
Total
16
17
Relinquished During Year:
18
Charges to Account 509
19
Other:
20
Allowances Used
21
Cost of Sales/Transfers:
22
23
24
25
26
27
28
Total
29
Balance-End of Year
30
31
Sales:
32
Net Sales Proceeds(Assoc. Co.)
33
Net Sales Proceeds (Other)
34
Gains
35
Losses
Allowances Withheld (Acct 158.2)
36
Balance-Beginning of Year
37
Add: Withheld by EPA
38
Deduct: Returned by EPA
39
Cost of Sales
40
Balance-End of Year
41
42
Sales
43
Net Sales Proceeds (Assoc. Co.)
44
Net Sales Proceeds (Other)
45
Gains
46
Losses


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
Allowances (Accounts 158.1 and 158.2)
  1. Report below the particulars (details) called for concerning allowances.
  2. Report all acquisitions of allowances at cost.
  3. Report allowances in accordance with a weighted average cost allocation method and other accounting as prescribed by General Instruction No. 21 in the Uniform System of Accounts.
  4. Report the allowances transactions by the period they are first eligible for use: the current year’s allowances in columns (b)-(c), allowances for the three succeeding years in columns (d)-(i), starting with the following year, and allowances for the remaining succeeding years in columns (j)-(k).
  5. Report on Line 4 the Environmental Protection Agency (EPA) issued allowances. Report withheld portions Lines 36-40.
  6. Report on Line 5 allowances returned by the EPA. Report on Line 39 the EPA’s sales of the withheld allowances. Report on Lines 43-46 the net sales proceeds and gains/losses resulting from the EPA’s sale or auction of the withheld allowances.
  7. Report on Lines 8-14 the names of vendors/transferors of allowances acquired and identify associated companies (See "associated company" under "Definitions" in the Uniform System of Accounts).
  8. Report on Lines 22 - 27 the name of purchasers/ transferees of allowances disposed of and identify associated companies.
  9. Report the net costs and benefits of hedging transactions on a separate line under purchases/transfers and sales/transfers.
  10. Report on Lines 32-35 and 43-46 the net sales proceeds and gains or losses from allowance sales.
Current Year Year One Year Two Year Three Future Years Totals
Line No.
NOx Allowances Inventory (Account 158.1)
(a)
No.
(b)
Amt.
(c)
No.
(d)
Amt.
(e)
No.
(f)
Amt.
(g)
No.
(h)
Amt.
(i)
No.
(j)
Amt.
(k)
No.
(l)
Amt.
(m)
1
Balance-Beginning of Year
2
3
Acquired During Year:
4
Issued (Less Withheld Allow)
5
Returned by EPA
6
7
8
9
10
11
12
13
14
15
Total
16
17
Relinquished During Year:
18
Charges to Account 509
19
Other:
20
Allowances Used
21
Cost of Sales/Transfers:
22
23
24
25
26
27
28
Total
29
Balance-End of Year
30
31
Sales:
32
Net Sales Proceeds(Assoc. Co.)
33
Net Sales Proceeds (Other)
34
Gains
35
Losses
Allowances Withheld (Acct 158.2)
36
Balance-Beginning of Year
37
Add: Withheld by EPA
38
Deduct: Returned by EPA
39
Cost of Sales
40
Balance-End of Year
41
42
Sales
43
Net Sales Proceeds (Assoc. Co.)
44
Net Sales Proceeds (Other)
45
Gains
46
Losses


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
EXTRAORDINARY PROPERTY LOSSES (Account 182.1)
WRITTEN OFF DURING YEAR
Line No.
DescriptionOfExtraordinaryPropertyLoss
Description of Extraordinary Loss [Include in the description the date of Commission Authorization to use Acc 182.1 and period of amortization (mo, yr to mo, yr).]
(a)
ExtraordinaryPropertyLossesNotYetRecognized
Total Amount of Loss
(b)
ExtraordinaryPropertyLossesRecognized
Losses Recognized During Year
(c)
ExtraordinaryPropertyLossesWrittenOffAccountCharged
Account Charged
(d)
ExtraordinaryPropertyLossesWrittenOff
Amount
(e)
ExtraordinaryPropertyLosses
Balance at End of Year
(f)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
20 TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
UNRECOVERED PLANT AND REGULATORY STUDY COSTS (182.2)
WRITTEN OFF DURING YEAR
Line No.
DescriptionOfUnrecoveredPlantAndRegulatoryStudyCosts
Description of Unrecovered Plant and Regulatory Study Costs [Include in the description of costs, the date of COmmission Authorization to use Acc 182.2 and period of amortization (mo, yr to mo, yr)]
(a)
UnrecoveredPlantAndRegulatoryStudyCostsNotYetRecognized
Total Amount of Charges
(b)
UnrecoveredPlantAndRegulatoryStudyCostsRecognized
Costs Recognized During Year
(c)
UnrecoveredPlantAndRegulatoryStudyCostsWrittenOffAccountCharged
Account Charged
(d)
UnrecoveredPlantAndRegulatoryStudyCostsWrittenOff
Amount
(e)
UnrecoveredPlantAndRegulatoryStudyCosts
Balance at End of Year
(f)
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
Transmission Service and Generation Interconnection Study Costs
  1. Report the particulars (details) called for concerning the costs incurred and the reimbursements received for performing transmission service and generator interconnection studies.
  2. List each study separately.
  3. In column (a) provide the name of the study.
  4. In column (b) report the cost incurred to perform the study at the end of period.
  5. In column (c) report the account charged with the cost of the study.
  6. In column (d) report the amounts received for reimbursement of the study costs at end of period.
  7. In column (e) report the account credited with the reimbursement received for performing the study.
Line No.
DescriptionOfStudyPerformed
Description
(a)
StudyCostsIncurred
Costs Incurred During Period
(b)
StudyCostsAccountCharged
Account Charged
(c)
StudyCostsReimbursements
Reimbursements Received During the Period
(d)
StudyCostsAccountReimbursed
Account Credited With Reimbursement
(e)
1
Transmission Studies
2
Basin
5,203
20
Total
5,203
21
Generation Studies
22
Aberdeen
4,078
13,619
23
Huron BGGS
1,000
24
Huron
1,000
39
Total
15,619
40 Grand Total
20,822


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
OTHER REGULATORY ASSETS (Account 182.3)
  1. Report below the particulars (details) called for concerning other regulatory assets, including rate order docket number, if applicable.
  2. Minor items (5% of the Balance in Account 182.3 at end of period, or amounts less than $100,000 which ever is less), may be grouped by classes.
  3. For Regulatory Assets being amortized, show period of amortization.
CREDITS
Line No.
DescriptionAndPurposeOfOtherRegulatoryAssets
Description and Purpose of Other Regulatory Assets
(a)
OtherRegulatoryAssets
Balance at Beginning of Current Quarter/Year
(b)
IncreaseDecreaseInOtherRegulatoryAssets
Debits
(c)
OtherRegulatoryAssetsWrittenOffAccountCharged
Written off During Quarter/Year Account Charged
(d)
OtherRegulatoryAssetsWrittenOffRecovered
Written off During the Period Amount
(e)
OtherRegulatoryAssets
Balance at end of Current Quarter/Year
(f)
1
Flow-through Income Taxes (South Dakota)
0
(a)
75,498,799
1,248,579
74,250,220
2
Excess Deferred Income Taxes (South Dakota)
0
6,752,895
173,250
(b)
6,579,645
3
Pension Plan (South Dakota)
0
5,814,695
438,637
5,376,058
4
Manufactured Gas Plants (South Dakota) - Docket NG 11-003
0
13,039,823
1,783,268
11,256,555
5
Field Inventory (South Dakota) - Docket EL 14-106
0
172,275
89,859
82,416
6
Asset Retirement Obligation (South Dakota)
0
1,005,326
1,005,326
0
7
Rate Case Costs (South Dakota) Docket EL 23-016
0
219,879
31,468
188,411
8
Electric Supply Tracker - SD
0
3,553,401
2,255,549
1,297,852
44
TOTAL
0
106,057,093
7,025,936
99,031,157


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: IncreaseDecreaseInOtherRegulatoryAssets

On January 1, 2024, NorthWestern Corporation contributed the assets and liabilities of its South Dakota and Nebraska regulated utilities to NorthWestern Energy Public Service Corporation, resulting in NorthWestern Corporation owning and operating the Montana regulated utility and NorthWestern Energy Public Service Corporation owning and operating the Nebraska and South Dakota utilities. The following balances represent the regulatory liabilities contributed to NorthWestern Energy Public Service Corporation  on January 1, 2024.

Description

Balance Contributed

Flow-through Income Taxes (South Dakota)

                    69,502,155

Excess Deferred Income Taxes (South Dakota)

                      6,747,525

Pension Plan (South Dakota)

                      5,814,695

Manufactured Gas Plants (South Dakota) - Docket NG 11-003

                    11,130,554

Rate Case Costs (South Dakota) Docket EL 23-016

                          190,623

Field Inventory (South Dakota)

                          172,275

Asset Retirement Obligation (South Dakota)

                      1,005,325

Total

                    94,563,152

 

 

(b) Concept: OtherRegulatoryAssets

Line No.

Description (a)

 (b)

 (c)

 (d)

1

SOUTH DAKOTA:

     

2

 

1/1/2024

3

 

Protected

Unprotected

 

4

TCJA Excess ADIT Account Reduced

190

190

Subtotal

5

Reg Asset Acccount Impacted

182.3

182.3

182.3

6

Electric:

     

7

Regulatory Assets / Liabilities

 

                                -

                                -

8

Unbilled Revenue

 

                                -

                                -

9

Compensation Accruals

 

                                -

                                -

10

Reserves & Accruals

 

                                -

                                -

11

Intangible amortization

 

                                -

                                -

12

Pension / Postretirement Benefits

 

                                -

                                -

13

Environmental Liability

 

                                -

                                -

14

Interest Rate Hedge

 

                                -

                                -

15

Customer Advances

 

                                -

                                -

16

Excess Tax Depreciation / Other Property

 

 

                                -

17

Net Operating Loss

               3,725,548

                                -

               3,725,548

18

Total Electric

               3,725,548

                                -

               3,725,548

19

Gas:

     

20

Regulatory Assets / Liabilities

 

                                -

                                -

21

Unbilled Revenue

 

                  237,268

                  237,268

22

Compensation Accruals

 

                  895,742

                  895,742

23

Reserves & Accruals

 

                     66,861

                     66,861

24

Intangible amortization

 

                                -

                                -

25

Pension / Postretirement Benefits

 

                  (67,853)

                  (67,853)

26

Environmental Liability

 

                  491,773

                  491,773

27

Interest Rate Hedge

 

                                -

                                -

28

Customer Advances

 

                                -

                                -

29

Excess Tax Depreciation / Other Property

 

 

                                -

30

Net Operating Loss

                (148,724)

                                -

                (148,724)

31

Total Gas

                (148,724)

               1,623,791

               1,475,067

32

Other (Specify)

                                -

                  129,930

                  129,930

33

Subtotal

               3,576,824

               1,753,721

               5,330,545

34

Gross-up

                  950,801

                  466,179

               1,416,980

35

Total

               4,527,625

               2,219,900

               6,747,525

36

       

37

Other (Specify)

     

38

QF Obligations

                                -

                                -

                                -

39

NOL Carryforward

                                -

                                -

                                -

40

AMT Credit Carryforward

                                -

                                -

                                -

41

Production Tax Credit

                                -

                                -

                                -

42

Regulatory Assets / Liabilities

                                -

                                -

                                -

43

Other, net

                                -

                  129,930

                  129,930

44

Total

                                -

                  129,930

                  129,930

45

       

46

       

47

 

12/31/2024

48

 

Protected

Unprotected

 

49

TCJA Excess ADIT Account Reduced

190

190

Subtotal

50

Reg Asset Acccount Impacted

182.3

182.3

182.3

51

Electric:

     

52

Regulatory Assets / Liabilities

 

                                -

                                -

53

Unbilled Revenue

 

                                -

                                -

54

Compensation Accruals

 

                                -

                                -

55

Reserves & Accruals

 

                                -

                                -

56

Intangible amortization

 

                                -

                                -

57

Pension / Postretirement Benefits

 

                                -

                                -

58

Environmental Liability

 

                                -

                                -

59

Interest Rate Hedge

 

                                -

                                -

60

Customer Advances

 

                                -

                                -

61

Excess Tax Depreciation / Other Property

 

 

                                -

62

Net Operating Loss

               3,587,409

                                -

               3,587,409

63

Total Electric

               3,587,409

                                -

               3,587,409

64

Gas:

     

65

Regulatory Assets / Liabilities

 

                                -

                                -

66

Unbilled Revenue

 

                  237,268

                  237,268

67

Compensation Accruals

 

                  895,742

                  895,742

68

Reserves & Accruals

 

                     66,862

                     66,862

69

Intangible amortization

 

                                -

                                -

70

Pension / Postretirement Benefits

 

                  (67,853)

                  (67,853)

71

Environmental Liability

 

                  491,773

                  491,773

72

Interest Rate Hedge

 

                                -

                                -

73

Customer Advances

 

                                -

                                -

74

Excess Tax Depreciation / Other Property

 

 

                                -

75

Net Operating Loss

                (143,211)

                                -

                (143,211)

76

Total Gas

                (143,211)

               1,623,792

               1,480,581

77

Other (Specify)

                                -

                  129,930

                  129,930

78

Subtotal

               3,444,198

               1,753,722

               5,197,920

79

Gross-up

                  915,546

                  466,179

               1,381,725

80

Total

               4,359,744

               2,219,901

               6,579,645

81

       

82

Other (Specify)

     

83

QF Obligations

                                -

                                -

                                -

84

NOL Carryforward

                                -

                                -

                                -

85

AMT Credit Carryforward

                                -

                                -

                                -

86

Production Tax Credit

                                -

                                -

                                -

87

Regulatory Assets / Liabilities

                                -

                                -

                                -

88

Other, net

                                -

                  129,930

                  129,930

89

Total

                                -

                  129,930

                  129,930


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
MISCELLANEOUS DEFFERED DEBITS (Account 186)
  1. Report below the particulars (details) called for concerning miscellaneous deferred debits.
  2. For any deferred debit being amortized, show period of amortization in column (a)
  3. Minor item (1% of the Balance at End of Year for Account 186 or amounts less than $100,000, whichever is less) may be grouped by classes.
CREDITS
Line No.
Description of Miscellaneous Deferred Debits
(a)
Balance at Beginning of Year
(b)
Debits
(c)
Credits Account Charged
(d)
Credits Amount
(e)
Balance at End of Year
(f)
1
Deferred Fuel for Electric Generation
0
(a)
262,625
262,625
0
2
Unamortized Debt Expense
0
11,061,581
1,594,242
9,467,339
3
Pension Requirement
0
388,615
89,036
299,579
47
Miscellaneous Work in Progress
48
Deferred Regulatory Comm. Expenses (See pages 350 - 351)
49
TOTAL
0
9,766,918


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: IncreaseInMiscellaneousDeferredExpense

On January 1, 2024, NorthWestern Corporation contributed the assets and liabilities of its South Dakota and Nebraska regulated utilities to NorthWestern Energy Public Service Corporation, resulting in NorthWestern Corporation owning and operating the Montana regulated utility and NorthWestern Energy Public Service Corporation owning and operating the Nebraska and South Dakota utilities. These balances represent the miscellaneous deferred debits contributed to NorthWestern Energy Public Service Corporation:

Deferred Fuel for Electric Generation

           262,625

Unamortized Debt Expense

        9,075,114

Pension Requirement

           372,313


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
ACCUMULATED DEFERRED INCOME TAXES (Account 190)
  1. Report the information called for below concerning the respondent’s accounting for deferred income taxes.
  2. At Other (Specify), include deferrals relating to other income and deductions.
Line No.
DescriptionOfAccumulatedDeferredIncomeTax
Description and Location
(a)
AccumulatedDeferredIncomeTaxes
Balance at Beginning of Year
(b)
AccumulatedDeferredIncomeTaxes
Balance at End of Year
(c)
1
Electric
2
Unbilled Revenue
(b)
1,977,771
3
Compensation Accruals
0
1,005,276
4
Reserves & Accruals
0
292,505
5
Pension / Postretirement Benefits
0
765,014
7
Other
0
(c)
20,521,761
8
TOTAL Electric (Enter Total of lines 2 thru 7)
0
23,032,299
9
Gas
10
Regulatory Asset/Liability
0
170,277
11
Unbilled Revenue
0
1,372,678
12
Compensation Accruals
0
687,677
13
Reserves & Accruals
0
203,323
14
Pension / Postretirement Benefits
0
525,674
15
Other
0
(d)
12,665,183
16
TOTAL Gas (Enter Total of lines 10 thru 15)
0
14,232,910
17.1
Other
0
(e)
63,697,369
17
Other (Specify)
18
TOTAL (Acct 190) (Total of lines 8, 16 and 17)
0
100,962,578
Notes


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: AccumulatedDeferredIncomeTaxes

On January 1, 2024, NorthWestern Corporation contributed the assets and liabilities of its South Dakota and Nebraska regulated utilities to NorthWestern Energy Public Service Corporation, resulting in NorthWestern Corporation owning and operating the Montana regulated utility and NorthWestern Energy Public Service Corporation owning and operating the Nebraska and South Dakota utilities.

(b) Concept: AccumulatedDeferredIncomeTaxes
 

Accumulated Deferred Income Taxes (Account 190)

   
 

Description and Location

Balance at Beginning of Year

Balance at End of  Year

 

(a)

(b)

(c)

Line No.

Electric

   

1

Regulatory Asset/Liability

                                  -

                                -  

2

Unbilled Revenue

                     1,996,104

                     1,977,771

3

Compensation Accruals

                       814,287

                     1,005,276

4

Reserves & Accruals

                       387,858

                       292,505

5

Pension / Postretirement Benefits

                      (723,823)

                      (765,014)

6

Environmental Liability

                     2,087,963

                     1,937,734

7

Interest Rate Hedge

                        (50,170)

                      (129,189)

8

Customer Advances

                                  -

                                -  

9

NOL Carryforward

                   20,109,652

                   18,713,216

10

Total Electric

                   24,621,871

                   23,032,299

11

Gas

   

12

Regulatory Asset/Liability

                         28,272

                      (170,277)

13

Unbilled Revenue

                     1,385,405

                     1,372,678

14

Compensation Accruals

                       554,955

                       687,677

15

Reserves & Accruals

                       269,586

                       203,323

16

Pension / Postretirement Benefits

                      (497,050)

                      (525,674)

17

Environmental Liability

                     1,450,041

                     1,345,645

18

Interest Rate Hedge

                        (36,330)

                        (91,241)

19

Customer Advances

                                  -

                                -  

20

NOL Carryforward

                     8,204,341

                   11,410,779

21

Total Gas

                   11,359,220

                   14,232,910

22

Other (Specify)

                   62,515,525

                   63,697,369

23

Total (Acct 190)

                   98,496,616

                 100,962,578

(c) Concept: AccumulatedDeferredIncomeTaxes

Electric Other:

   
 

Description and Location

   
 

(a)

Balance at Beginning of Year

Balance at End of  Year

Line No.

 

(b)

( c)

1

Environmental Liability

                     2,087,963

                     1,937,734

2

Interest Rate Hedge

                        (50,170)

                      (129,189)

3

Customer Advances

                                  -

                                  -

4

NOL Carryforward

                   20,109,652

                   18,713,216

   

                   22,147,445

                   20,521,761

(d) Concept: AccumulatedDeferredIncomeTaxes

Gas Other:

       

Description and Location

 

Balance at Beginning of Year

 

Balance at End of  Year

(a)

 

(f)

 

( g)

Environmental Liability

 

                     1,450,041

 

                  1,345,645

Interest Rate Hedge

 

                        (36,330)

 

                     (91,241)

NOL Carryforward

 

                     8,204,341

 

                11,410,779

Total Gas

 

                     9,618,052

 

                12,665,183

 

 

 

 

 

(e) Concept: AccumulatedDeferredIncomeTaxes

Account 190 Other (Specify)

       

Description and Location

 

Balance at Beginning of Year

 

Balance at End of  Year

(a)

 

(f)

 

( g)

Production Tax Credit

 

                   61,004,195

 

                62,093,063

Other, net

 

                     1,511,330

 

                  1,604,306

Total

 

                   62,515,525

 

                63,697,369


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
CAPITAL STOCKS (Account 201 and 204)
  1. Report below the particulars (details) called for concerning common and preferred stock at end of year, distinguishing separate series of any general class. Show separate totals for common and preferred stock. If information to meet the stock exchange reporting requirement outlined in column (a) is available from the SEC 10-K Report Form filing, a specific reference to report form (i.e., year and company title) may be reported in column (a) provided the fiscal years for both the 10-K report and this report are compatible.
  2. Entries in column (b) should represent the number of shares authorized by the articles of incorporation as amended to end of year.
  3. Give details concerning shares of any class and series of stock authorized to be issued by a regulatory commission which have not yet been issued.
  4. The identification of each class of preferred stock should show the dividend rate and whether the dividends are cumulative or noncumulative.
  5. State in a footnote if any capital stock that has been nominally issued is nominally outstanding at end of year.
  6. Give particulars (details) in column (a) of any nominally issued capital stock, reacquired stock, or stock in sinking and other funds which is pledged, stating name of pledgee and purpose of pledge.
Line No.
Class and Series of Stock and Name of Stock Series
(a)
Number of Shares Authorized by Charter
(b)
Par or Stated Value per Share
(c)
Call Price at End of Year
(d)
Outstanding per Bal. Sheet (Total amount outstanding without reduction for amounts held by respondent) Shares
(e)
Outstanding per Bal. Sheet (Total amount outstanding without reduction for amounts held by respondent) Amount
(f)
Held by Respondent As Reacquired Stock (Acct 217) Shares
(g)
Held by Respondent As Reacquired Stock (Acct 217) Cost
(h)
Held by Respondent In Sinking and Other Funds Shares
(i)
Held by Respondent In Sinking and Other Funds Amount
(j)
1
Common Stock (Account 201)
2
3
4
5
Total
100
100
1
6
Preferred Stock (Account 204)
7
8
9
10
Total


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

2024-12-31
Year/Period of Report

End of:
2024
/
Q4
Other Paid-in Capital
1. Report below the balance at the end of the year and the information specified below for the respective other paid-in capital accounts. Provide a subheading for each account and show a total for the account, as well as a total of all accounts for reconciliation with the balance sheet, page 112. Explain changes made in any account during the year and give the accounting entries effecting such change.
  1. Donations Received from Stockholders (Account 208) - State amount and briefly explain the origin and purpose of each donation.
  2. Reduction in Par or Stated Value of Capital Stock (Account 209) - State amount and briefly explain the capital changes that gave rise to amounts reported under this caption including identification with the class and series of stock to which related.
  3. Gain or Resale or Cancellation of Reacquired Capital Stock (Account 210) - Report balance at beginning of year, credits, debits, and balance at end of year with a designation of the nature of each credit and debit identified by the class and series of stock to which related.
  4. Miscellaneous Paid-In Capital (Account 211) - Classify amounts included in this account according to captions that, together with brief explanations, disclose the general nature of the transactions that gave rise to the reported amounts.
Line No.
Item
(a)
Amount
(b)
1
DonationsReceivedFromStockholdersAbstract
Donations Received from Stockholders (Account 208)
2
DonationsReceivedFromStockholders
Beginning Balance Amount
3
IncreasesDecreasesFromSalesOfDonationsReceivedFromStockholders
Increases (Decreases) from Sales of Donations Received from Stockholders
4
DonationsReceivedFromStockholders
Ending Balance Amount
5
ReductionInParOrStatedValueOfCapitalStockAbstract
Reduction in Par or Stated Value of Capital Stock (Account 209)
6
ReductionInParOrStatedValueOfCapitalStock
Beginning Balance Amount
7
IncreasesDecreasesDueToReductionsInParOrStatedValueOfCapitalStock
Increases (Decreases) Due to Reductions in Par or Stated Value of Capital Stock
8
ReductionInParOrStatedValueOfCapitalStock
Ending Balance Amount
9
GainOrResaleOrCancellationOfReacquiredCapitalStockAbstract
Gain or Resale or Cancellation of Reacquired Capital Stock (Account 210)
10
GainOnResaleOrCancellationOfReacquiredCapitalStock
Beginning Balance Amount
11
IncreasesDecreasesFromGainOrResaleOrCancellationOfReacquiredCapitalStock
Increases (Decreases) from Gain or Resale or Cancellation of Reacquired Capital Stock
12
GainOnResaleOrCancellationOfReacquiredCapitalStock
Ending Balance Amount
13
MiscellaneousPaidInCapitalAbstract
Miscellaneous Paid-In Capital (Account 211)
14
MiscellaneousPaidInCapital
Beginning Balance Amount
15.1
IncreasesDecreasesDueToMiscellaneousPaidInCapital
Equity contribution from NorthWestern Corporation
580,199,253
15.2
IncreasesDecreasesDueToMiscellaneousPaidInCapital
Stock compensation
792,387
15
IncreasesDecreasesDueToMiscellaneousPaidInCapital
Increases (Decreases) Due to Miscellaneous Paid-In Capital
580,991,640
16
MiscellaneousPaidInCapital
Ending Balance Amount
580,991,640
17
OtherPaidInCapitalAbstract
Other Paid in Capital
18
OtherPaidInCapitalDetail
Beginning Balance Amount
19
IncreasesDecreasesInOtherPaidInCapital
Increases (Decreases) in Other Paid-In Capital
20
OtherPaidInCapitalDetail
Ending Balance Amount
40
OtherPaidInCapital
Total
580,991,640


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
CAPITAL STOCK EXPENSE (Account 214)
  1. Report the balance at end of the year of discount on capital stock for each class and series of capital stock.
  2. If any change occurred during the year in the balance in respect to any class or series of stock, attach a statement giving particulars (details) of the change. State the reason for any charge-off of capital stock expense and specify the account charged.
Line No.
NameOfClassAndSeriesOfStock
Class and Series of Stock
(a)
CapitalStockExpense
Balance at End of Year
(b)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
LONG-TERM DEBT (Account 221, 222, 223 and 224)
  1. Report by Balance Sheet Account the details concerning long-term debt included in Accounts 221, Bonds, 222, Reacquired Bonds, 223, Advances from Associated Companies, and 224, Other Long-Term Debt.
  2. For bonds assumed by the respondent, include in column (a) the name of the issuing company as well as a description of the bonds, and in column (b) include the related account number.
  3. For Advances from Associated Companies, report separately advances on notes and advances on open accounts. Designate demand notes as such. Include in column (a) names of associated companies from which advances were received, and in column (b) include the related account number.
  4. For receivers' certificates, show in column (a) the name of the court and date of court order under which such certificates were issued, and in column (b) include the related account number.
  5. In a supplemental statement, give explanatory details for Accounts 223 and 224 of net changes during the year. With respect to long-term advances, show for each company: (a)principal advanced during year (b) interest added to principal amount, and (c) principal repaid during year. Give Commission authorization numbers and dates.
  6. If the respondent has pledged any of its long-term debt securities, give particulars (details) in a footnote, including name of the pledgee and purpose of the pledge.
  7. If the respondent has any long-term securities that have been nominally issued and are nominally outstanding at end of year, describe such securities in a footnote.
  8. If interest expense was incurred during the year on any obligations retired or reacquired before end of year, include such interest expense in column (m). Explain in a footnote any difference between the total of column (m) and the total Account 427, Interest on Long-Term Debt and Account 430, Interest on Debt to Associated Companies.
  9. Give details concerning any long-term debt authorized by a regulatory commission but not yet issued.
Line No.
ClassAndSeriesOfObligationCouponRateDescription
Class and Series of Obligation, Coupon Rate (For new issue, give commission Authorization numbers and dates)
(a)
RelatedAccountNumber
Related Account Number
(b)
Principal Amount of Debt Issued
(c)
LongTermDebtIssuanceExpensePremiumOrDiscount
Total Expense, Premium or Discount
(d)
LongTermDebtIssuanceExpenses
Total Expense
(e)
LongTermDebtPremium
Total Premium
(f)
LongTermDebtDiscount
Total Discount
(g)
NominalDateOfIssue
Nominal Date of Issue
(h)
DateOfMaturity
Date of Maturity
(i)
AmortizationPeriodStartDate
AMORTIZATION PERIOD Date From
(j)
AmortizationPeriodEndDate
AMORTIZATION PERIOD Date To
(k)
Outstanding (Total amount outstanding without reduction for amounts held by respondent)
(l)
Interest for Year Amount
(m)
1
Bonds (Account 221)
2
First Mortgage Bonds 5.01% (South Dakota)
(a)
64,000,000
412,254
1,880,320
05/27/2010
05/01/2025
05/27/2010
05/01/2025
64,000,000
3,206,400
3
First Mortgage Bonds 4.15% (South Dakota)
30,000,000
184,030
08/10/2012
08/10/2042
08/10/2012
08/10/2042
30,000,000
1,245,000
4
First Mortgage Bonds 4.30% (South Dakota)
20,000,000
122,686
08/10/2012
08/10/2052
08/10/2012
08/10/2052
20,000,000
860,000
5
First Mortgage Bonds 4.85% (South Dakota)
50,000,000
278,988
12/19/2013
12/19/2043
12/19/2013
12/19/2043
50,000,000
2,425,000
6
First Mortgage Bonds 4.22% (South Dakota)
30,000,000
207,702
12/19/2014
12/19/2044
12/19/2014
12/19/2044
30,000,000
1,266,000
7
First Mortgage Bonds 4.26% (South Dakota)
70,000,000
314,529
09/29/2015
09/29/2040
09/29/2015
09/29/2040
70,000,000
2,982,000
8
First Mortgage Bonds 2.80% (South Dakota)
60,000,000
377,548
4,928,484
06/15/2016
06/15/2026
06/15/2016
06/15/2026
60,000,000
1,680,000
9
First Mortgage Bonds 2.66% (South Dakota)
45,000,000
250,872
09/30/2016
09/30/2026
09/30/2016
09/30/2026
45,000,000
1,197,000
10
First Mortgage Bonds 3.21% (South Dakota)
50,000,000
352,905
05/15/2020
05/15/2030
05/15/2020
05/15/2030
50,000,000
1,605,000
11
First Mortgage Bonds 5.57% (South Dakota)
31,000,000
173,454
03/30/2023
03/30/2033
03/30/2023
03/30/2033
31,000,000
1,726,700
12
First Mortgage Bonds 5.42% (South Dakota)
30,000,000
167,866
05/01/2023
05/01/2023
05/01/2023
05/01/2023
30,000,000
1,626,000
13
First Mortgage Bonds 5.55% (South Dakota)
33,000,000
212,437
03/28/2024
03/28/2029
03/28/2024
03/28/2029
33,000,000
1,373,625
14
First Mortgage Bonds 5.75% (South Dakota)
7,000,000
45,947
03/28/2024
03/28/2034
03/28/2024
03/28/2034
7,000,000
301,875
15
Subtotal
520,000,000
3,101,218
6,808,804
(b)
520,000,000
21,494,600
16
Reacquired Bonds (Account 222)
17
18
19
20
Subtotal
21
Advances from Associated Companies (Account 223)
22
23
24
25
Subtotal
26
Other Long Term Debt (Account 224)
27
Senior Unsecured Revolving Line of Credit ($150m)
34,000,000
11/30/2023
11/30/2028
11/30/2023
11/30/2028
34,000,000
2,020,993
28
Subtotal
34,000,000
(c)
34,000,000
2,020,993
33 TOTAL
554,000,000
554,000,000
23,515,593


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: BondsPrincipalAmountIssued

As issuances are redeemed, the related expense and premium or discount, as applicable, is charged to Loss on Reacquired Debt.

(b) Concept: Bonds

Bonds (221) (Total Company) for 2023 - $480,000,000

(c) Concept: OtherLongTermDebt

Other Long Term Debt (224) attributable to South Dakota and Nebraska operations as of December 31, 2023 - $54,000,000.


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
RECONCILIATION OF REPORTED NET INCOME WITH TAXABLE INCOME FOR FEDERAL INCOME TAXES
  1. Report the reconciliation of reported net income for the year with taxable income used in computing Federal income tax accruals and show computation of such tax accruals. Include in the reconciliation, as far as practicable, the same detail as furnished on Schedule M-1 of the tax return for the year. Submit a reconciliation even though there is no taxable income for the year. Indicate clearly the nature of each reconciling amount.
  2. If the utility is a member of a group which files a consolidated Federal tax return, reconcile reported net income with taxable net income as if a separate return were to be field, indicating, however, intercompany amounts to be eliminated in such a consolidated return. State names of group member, tax assigned to each group member, and basis of allocation, assignment, or sharing of the consolidated tax among the group members.
  3. A substitute page, designed to meet a particular need of a company, may be used as Long as the data is consistent and meets the requirements of the above instructions. For electronic reporting purposes complete Line 27 and provide the substitute Page in the context of a footnote.
Line No.
Particulars (Details)
(a)
Amount
(b)
1
Net Income for the Year (Page 117)
30,932,544
2
Reconciling Items for the Year
3
4
Taxable Income Not Reported on Books
5
6
7
8
9
Deductions Recorded on Books Not Deducted for Return
10
Meals and Entertainment
205,162
11
Non-Deductible Dues/Lobbying Expense/Penalties/Professional Fees/Non-Deductible Parking/GILTI Inclusion
459,139
12
Federal Income Taxes
7,159,233
13
State Tax Adjustment
416,808
14
Income Recorded on Books Not Included in Return
15
16
17
18
19
Deductions on Return Not Charged Against Book Income
20
Net Tax Greater Than Book Depreciation
24,381,546
21
Amortization of Intangibles
22
Plant Flow Through Items
3,412,397
23
Reserves & Accruals
4,829,802
24
Deferred Book Revenue & Gains
141,728
25
Contributions & Advances for Construction
871,800
26
NOL Carryforward
8,619,060
27
Other Miscellaneous
2,317,767
27
Federal Tax Net Income
4,181,029
28
Show Computation of Tax:
29
Federal Tax Expense/(Benefit) @ 21%
878,016


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
TAXES ACCRUED, PREPAID AND CHARGES DURING YEAR
  1. Give particulars (details) of the combined prepaid and accrued tax accounts and show the total taxes charged to operations and other accounts during the year. Do not include gasoline and other sales taxes which have been charged to the accounts to which the taxed material was charged. If the actual, or estimated amounts of such taxes are known, show the amounts in a footnote and designate whether estimated or actual amounts.
  2. Include on this page, taxes paid during the year and charged direct to final accounts, (not charged to prepaid or accrued taxes.) Enter the amounts in both columns (g) and (h). The balancing of this page is not affected by the inclusion of these taxes.
  3. Include in column (g) taxes charged during the year, taxes charged to operations and other accounts through (a) accruals credited to taxes accrued, (b)amounts credited to proportions of prepaid taxes chargeable to current year, and (c) taxes paid and charged direct to operations or accounts other than accrued and prepaid tax accounts.
  4. List the aggregate of each kind of tax in such manner that the total tax for each State and subdivision can readily be ascertained.
  5. If any tax (exclude Federal and State income taxes) covers more than one year, show the required information separately for each tax year, identifying the year in column (d).
  6. Enter all adjustments of the accrued and prepaid tax accounts in column (i) and explain each adjustment in a foot- note. Designate debit adjustments by parentheses.
  7. Do not include on this page entries with respect to deferred income taxes or taxes collected through payroll deductions or otherwise pending transmittal of such taxes to the taxing authority.
  8. Report in columns (l) through (o) how the taxes were distributed. Report in column (o) only the amounts charged to Accounts 408.1 and 409.1 pertaining to electric operations. Report in column (l) the amounts charged to Accounts 408.1 and 409.1 pertaining to other utility departments and amounts charged to Accounts 408.2 and 409.2. Also shown in column (o) the taxes charged to utility plant or other balance sheet accounts.
  9. For any tax apportioned to more than one utility department or account, state in a footnote the basis (necessity) of apportioning such tax.
BALANCE AT BEGINNING OF YEAR BALANCE AT END OF YEAR DISTRIBUTION OF TAXES CHARGED
Line No.
DescriptionOfTaxesAccruedPrepaidAndCharged
Kind of Tax (See Instruction 5)
(a)
TypeOfTax
Type of Tax
(b)
TaxJurisdiction
State
(c)
TaxYear
Tax Year
(d)
TaxesAccrued
Taxes Accrued (Account 236)
(e)
PrepaidTaxes
Prepaid Taxes (Include in Account 165)
(f)
TaxesCharged
Taxes Charged During Year
(g)
TaxesPaid
Taxes Paid During Year
(h)
TaxAdjustments
Adjustments
(i)
TaxesAccrued
Taxes Accrued (Account 236)
(j)
PrepaidTaxes
Prepaid Taxes (Included in Account 165)
(k)
TaxesAccruedPrepaidAndCharged
Electric (Account 408.1, 409.1)
(l)
IncomeTaxesExtraordinaryItems
Extraordinary Items (Account 409.3)
(m)
AdjustmentsToRetainedEarnings
Adjustment to Ret. Earnings (Account 439)
(n)
TaxesIncurredOther
Other
(o)
1
FICA and Medicare
Federal Tax
South Dakota
2024
0
4,836,300
4,836,300
0
785,183
4,051,117
2
State Income Tax
State Tax
South Dakota/Nebraska
2024
0
(a)
187,000
187,000
0
0
3
Gross Receipts Tax
Other Taxes
South Dakota
2023
0
375,390
(b)
375,390
0
4
Gross Receipts Tax
Other Taxes
South Dakota
2024
0
366,592
366,592
260,274
106,318
5
Coal Conversion Tax
Other Taxes
North Dakota
2024
0
29,947
29,947
0
29,947
0
6
Property Tax
Property Tax
South Dakota
2023
0
107,300
5,122,650
(c)
5,229,950
0
107,300
0
7
Property Tax
Property Tax
South Dakota
2024
0
5,653,332
5,653,332
4,962,480
690,852
8
Property Tax
Property Tax
Nebraska
2023
0
58,458
759,928
(d)
818,386
0
0
58,458
9
Property Tax
Property Tax
Nebraska
2024
0
867,888
867,888
0
867,888
10
Property Tax
Property Tax
North Dakota
2023
0
278
15,841
(e)
16,119
0
278
0
11
Property Tax
Property Tax
North Dakota
2024
0
16,848
16,848
16,848
0
12
Property Tax
Property Tax
Iowa
2022
0
8,881
60,163
(f)
51,282
0
8,881
0
13
Property Tax
Property Tax
Iowa
2023
0
0
65,431
(g)
81,520
16,089
0
0
14
Property Tax
Property Tax
Iowa
2024
0
123,935
123,935
123,935
0
15
Federal Unemplyment Tax
Unemployment Tax
South Dakota
2023
0
477
(h)
477
0
0
0
16
Federal Unemplyment Tax
Unemployment Tax
South Dakota
2024
0
14,267
14,039
228
2,469
11,798
17
State Unemployment Tax
Unemployment Tax
South Dakota
2023
0
529
(i)
529
0
0
0
18
State Unemployment Tax
Unemployment Tax
South Dakota
2024
0
8,639
8,493
146
1,340
7,299
19
Use Tax
Sales And Use Tax
South Dakota
2023
0
65,435
(j)
65,435
0
0
0
20
Use Tax
Sales And Use Tax
South Dakota
2024
0
609,647
535,770
73,877
0
609,647
21
Federal Income Tax
Income Tax
South Dakota/Nebraska
2024
0
5,995,592
(k)
6,871,919
876,327
5,094,327
901,265
22
Delaware Franchise Tax
Franchise Tax
South Dakota
2024
0
15,788
15,788
0
9,287
6,501
40
TOTAL
0
6,390,436
11,906,181
13,324,007
7,808,262
(l)
998,739
5,391,697


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: TaxAdjustments

On January 1, 2024, the South Dakota Operations Taxes Accrued balances were distributed to NorthWestern Energy Public Service Corporation.

(b) Concept: TaxAdjustments

On January 1, 2024, the South Dakota Operations Taxes Accrued balances were distributed to NorthWestern Energy Public Service Corporation.

(c) Concept: TaxAdjustments

On January 1, 2024, the South Dakota Operations Taxes Accrued balances were distributed to NorthWestern Energy Public Service Corporation.

(d) Concept: TaxAdjustments

On January 1, 2024, the South Dakota Operations Taxes Accrued balances were distributed to NorthWestern Energy Public Service Corporation.

(e) Concept: TaxAdjustments

On January 1, 2024, the South Dakota Operations Taxes Accrued balances were distributed to NorthWestern Energy Public Service Corporation.

(f) Concept: TaxAdjustments

On January 1, 2024, the South Dakota Operations Taxes Accrued balances were distributed to NorthWestern Energy Public Service Corporation.

(g) Concept: TaxAdjustments

On January 1, 2024, the South Dakota Operations Taxes Accrued balances were distributed to NorthWestern Energy Public Service Corporation.

(h) Concept: TaxAdjustments

On January 1, 2024, the South Dakota Operations Taxes Accrued balances were distributed to NorthWestern Energy Public Service Corporation.

(i) Concept: TaxAdjustments

On January 1, 2024, the South Dakota Operations Taxes Accrued balances were distributed to NorthWestern Energy Public Service Corporation.

(j) Concept: TaxAdjustments

On January 1, 2024, the South Dakota Operations Taxes Accrued balances were distributed to NorthWestern Energy Public Service Corporation.

(k) Concept: TaxAdjustments

Proceeds from production tax credits transferred.

(l) Concept: TaxesAccruedPrepaidAndCharged

South Dakota Electric - taxes accrued, exclusive of fedearl and state income taxes

 Taxes Charged During the Year 2024

(b)

 (c) 

Property-South Dakota

                              4,855,179

Property-North Dakota

                                   16,570

Property - Iowa

                                 132,816

Coal Conversion Facility - N Dakota

                                   29,947

Gross Revenue - South Dakota

                                 260,274

Delaware Franchise

                                     9,287

Payroll Tax - FICA

                                 614,660

Payroll Tax - Medicare

                                 170,523

Payroll Tax - FUT

                                     2,470

Payroll Tax - SUT - SD

                                     1,341

 

                              6,093,066


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
ACCUMULATED DEFERRED INVESTMENT TAX CREDITS (Account 255)

Report below information applicable to Account 255. Where appropriate, segregate the balances and transactions by utility and nonutility operations. Explain by footnote any correction adjustments to the account balance shown in column (g). Include in column (i) the average period over which the tax credits are amortized.

Deferred for Year Allocations to Current Year's Income
Line No.
Account Subdivisions
(a)
Balance at Beginning of Year
(b)
Account No.
(c)
Amount
(d)
Account No.
(e)
Amount
(f)
Adjustments
(g)
Balance at End of Year
(h)
Average Period of Allocation to Income
(i)
ADJUSTMENT EXPLANATION
(j)
1
Electric Utility
2
3%
3
4%
4
7%
5
10%
8
TOTAL Electric (Enter Total of lines 2 thru 7)
9
Other (List separately and show 3%, 4%, 7%, 10% and TOTAL)
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
47 OTHER TOTAL
48 GRAND TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
OTHER DEFERRED CREDITS (Account 253)
  1. Report below the particulars (details) called for concerning other deferred credits.
  2. For any deferred credit being amortized, show the period of amortization.
  3. Minor items (5% of the Balance End of Year for Account 253 or amounts less than $100,000, whichever is greater) may be grouped by classes.
DEBITS
Line No.
Description and Other Deferred Credits
(a)
Balance at Beginning of Year
(b)
Contra Account
(c)
Amount
(d)
Credits
(e)
Balance at End of Year
(f)
1
Family Protector Plan Future Payments
0
300,332
(a)
300,332
0
2
Projects & Studies Prepaid by Customer
0
11,755
23,296
11,541
3
Permanent Uncertain Tax Positions
0
45,494
10,409
35,085
4
Other Minor Items (4) - some are amortized over various periods
0
5,812,015
15,807,405
9,995,390
47
TOTAL
0
6,169,596
16,141,442
9,971,846


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: IncreaseInOtherDeferredCredits

On January 1, 2024, NorthWestern Corporation contributed the assets and liabilities of its South Dakota and Nebraska regulated utilities to NorthWestern Energy Public Service Corporation, resulting in NorthWestern Corporation owning and operating the Montana regulated utility and NorthWestern Energy Public Service Corporation owning and operating the Nebraska and South Dakota utilities. These balances represent the other deferred credits contributed to NorthWestern Energy Public Service Corporation:

Family Protector Plan Future Payments

            300,332

Projects & Studies Prepaid by Customer

              (5,202)

Permanent Uncertain Tax Positions

            (41,021)

Other Minor Items (4) - some are amortized over various periods

         6,580,483


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report


End of:
2024
/
Q4
ACCUMULATED DEFERRED INCOME TAXES - ACCELERATED AMORTIZATION PROPERTY (Account 281)
  1. Report the information called for below concerning the respondent’s accounting for deferred income taxes rating to amortizable property.
  2. For other (Specify),include deferrals relating to other income and deductions.
  3. Use footnotes as required.
CHANGES DURING YEAR ADJUSTMENTS
Debits Credits
Line No.
Account
(a)
Balance at Beginning of Year
(b)
Amounts Debited to Account 410.1
(c)
Amounts Credited to Account 411.1
(d)
Amounts Debited to Account 410.2
(e)
Amounts Credited to Account 411.2
(f)
Account Credited
(g)
Amount
(h)
Account Debited
(i)
Amount
(j)
Balance at End of Year
(k)
1
Accelerated Amortization (Account 281)
2
Electric
3
Defense Facilities
4
Pollution Control Facilities
5
Other
5.1
Other
5.2
Other
8
TOTAL Electric (Enter Total of lines 3 thru 7)
9
Gas
10
Defense Facilities
11
Pollution Control Facilities
12
Other
12.1
Other
12.2
Other
15
TOTAL Gas (Enter Total of lines 10 thru 14)
16
Other
16.1
Other
16.2
Other
17
TOTAL (Acct 281) (Total of 8, 15 and 16)
18
Classification of TOTAL
19
Federal Income Tax
20
State Income Tax
21
Local Income Tax


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
ACCUMULATED DEFERRED INCOME TAXES - OTHER PROPERTY (Account 282)
  1. Report the information called for below concerning the respondent’s accounting for deferred income taxes rating to property not subject to accelerated amortization.
  2. For other (Specify),include deferrals relating to other income and deductions.
  3. Use footnotes as required.
CHANGES DURING YEAR ADJUSTMENTS
Debits Credits
Line No.
Account
(a)
Balance at Beginning of Year
(b)
Amounts Debited to Account 410.1
(c)
Amounts Credited to Account 411.1
(d)
Amounts Debited to Account 410.2
(e)
Amounts Credited to Account 411.2
(f)
Account Credited
(g)
Amount
(h)
Account Debited
(i)
Amount
(j)
Balance at End of Year
(k)
1 Account 282
2
Electric
0
2,379,868
(a)
90,836,092
93,215,960
3
Gas
0
3,272,384
17,544,642
20,817,026
4
Other (Specify)
0
5
Total (Total of lines 2 thru 4)
0
5,652,252
108,380,734
114,032,986
6
7
8
9
TOTAL Account 282 (Total of Lines 5 thru 8)
0
5,652,252
108,380,734
114,032,986
10
Classification of TOTAL
11
Federal Income Tax
0
5,652,252
108,380,734
114,032,986
12
State Income Tax
0
13
Local Income Tax


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: AccumulatedDeferredIncomeTaxLiabilitiesOtherPropertyAdjustmentsCreditedToAccount

This column represents the balances transfered to NorthWestern Energy Public Service Corporation on January 1, 2024, from NorthWestern Corporation as part of effectuating the holding company reorganization.


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
ACCUMULATED DEFERRED INCOME TAXES - OTHER (Account 283)
  1. Report the information called for below concerning the respondent's accounting for deferred income taxes relating to amounts recorded in Account 283.
  2. For other (Specify),include deferrals relating to other income and deductions.
  3. Provide in the space below explanations for Page 276. Include amounts relating to insignificant items listed under Other.
  4. Use footnotes as required.
CHANGES DURING YEAR ADJUSTMENTS
Debits Credits
Line No.
Account
(a)
Balance at Beginning of Year
(b)
Amounts Debited to Account 410.1
(c)
Amounts Credited to Account 411.1
(d)
Amounts Debited to Account 410.2
(e)
Amounts Credited to Account 411.2
(f)
Account Credited
(g)
Amount
(h)
Account Debited
(i)
Amount
(j)
Balance at End of Year
(k)
1 Account 283
2
Electric
3
Regulatory Assets
0
651,386
(a)
278,680
930,066
4
Excess Tax Depreciation
0
294,057
9,060,796
9,354,853
9 TOTAL Electric (Total of lines 3 thru 8)
0
651,386
294,057
9,339,476
10,284,919
10
Gas
11
Regulatory Assets
217,783
3,287,763
3,069,980
12
Excess Tax Depreciation
831,619
2,680,508
3,512,127
17 TOTAL Gas (Total of lines 11 thru 16)
217,783
831,619
5,968,271
6,582,107
18 TOTAL Other
4,833
108,405
103,572
19 TOTAL (Acct 283) (Enter Total of lines 9, 17 and 18)
651,386
217,783
1,130,509
108,405
15,307,747
16,763,454
20
Classification of TOTAL
21
Federal Income Tax
651,386
217,783
1,130,509
108,405
15,307,747
16,763,454
22
State Income Tax
23
Local Income Tax
NOTES


FOOTNOTE DATA

(a) Concept: AccumulatedDeferredIncomeTaxLiabilitiesOtherAdjustmentsCreditedToAccount

This column represents the balances transfered to NorthWestern Energy Public Service Corporation on January 1, 2024, from NorthWestern Corporation as part of effectuating the holding company reorganization.


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
OTHER REGULATORY LIABILITIES (Account 254)
  1. Report below the particulars (details) called for concerning other regulatory liabilities, including rate order docket number, if applicable.
  2. Minor items (5% of the Balance in Account 254 at end of period, or amounts less than $100,000 which ever is less), may be grouped by classes.
  3. For Regulatory Liabilities being amortized, show period of amortization.
DEBITS
Line No.
Description and Purpose of Other Regulatory Liabilities
(a)
Balance at Beginning of Current Quarter/Year
(b)
Account Credited
(c)
Amount
(d)
Credits
(e)
Balance at End of Current Quarter/Year
(f)
1
Excess Deferred Income Taxes (South Dakota)
0
1,442,050
(a)
19,166,771
(b)
17,724,721
2
Current Ad Valorem True-Up (South Dakota) - Docket GE98-001
0
719,784
924,486
204,702
3
Unbilled Revenues (South Dakota)
0
5,289,248
21,128,893
15,839,645
4
Tax Cut Jobs Act Deferral (South Dakota) - Docket GE17-003 & EL23-016
0
51,668
155,000
103,332
41 TOTAL
0
7,502,750
41,375,150
33,872,400


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: IncreaseInOtherRegulatoryLiabilities

On January 1, 2024, NorthWestern Corporation contributed the assets and liabilities of its South Dakota and Nebraska regulated utilities to NorthWestern Energy Public Service Corporation, resulting in NorthWestern Corporation owning and operating the Montana regulated utility and NorthWestern Energy Public Service Corporation owning and operating the Nebraska and South Dakota utilities. The following balances represent the regulatory liabilities contributed to NorthWestern Energy Public Service Corporation  on January 1, 2024.

Description

Balance Contributed

Excess Deferred Income Taxes (South Dakota)

                    18,511,551

Current Ad Valorem True-Up (South Dakota) - Docket GE98-001

                          889,831

Unbilled Revenues (South Dakota)

                    16,004,291

Tax Cut Jobs Act Deferral (South Dakota) - Docket NG-0095 and GE17-003

                          155,000

Total

                    35,560,673

 

 

(b) Concept: OtherRegulatoryLiabilities

Line No.

Description (a)

 (b)

 (c)

 (d)

 (e)

 (f)

 (g)

 (h)

          1

SOUTH DAKOTA:

             

          2

 

12/31/2023

          3

 

Protected

Unprotected

Unprotected

   

Normalizing EDIT

 

          4

TCJA Excess ADIT Account Reduced

282

282

283

Subtotal

Total of 182.3

Subtotal

282

          5

Reg Asset Acccount Impacted

254

254

254

254

and 254

182.3

254

          6

Electric:

             

          7

Regulatory Assets / Liabilities

 

 

                                -

                                -

                                -

                                -

                                -

          8

Unbilled Revenue

 

 

                                -

                                -

                                -

                                -

                                -

          9

Compensation Accruals

 

 

                                -

                                -

                                -

                                -

                                -

       10

Reserves & Accruals

 

 

                                -

                                -

                                -

                                -

                                -

       11

Intangible amortization

 

 

                                -

                                -

                                -

                                -

                                -

       12

Pension / Postretirement Benefits

 

 

                                -

                                -

                                -

                                -

                                -

       13

Environmental Liability

 

 

                                -

                                -

                                -

                                -

                                -

       14

Interest Rate Hedge

 

 

                                -

                                -

                                -

                                -

                                -

       15

Customer Advances

 

 

                                -

                                -

                                -

                                -

                                -

       16

Excess Tax Depreciation / Other Property

          (13,669,144)

                                -

                                -

          (13,669,144)

          (13,669,144)

          (12,536,650)

          (26,205,794)

       17

Net Operating Loss

 

 

 

                                -

               3,725,548

                                -

               3,725,548

       18

Total Electric

          (13,669,144)

                                -

                                -

          (13,669,144)

            (9,943,596)

          (12,536,650)

          (22,480,246)

       19

Gas:

             

       20

Regulatory Assets / Liabilities

 

 

                (238,951)

                (238,951)

                (238,951)

                                -

                (238,951)

       21

Unbilled Revenue

 

 

                                -

                                -

                  237,268

                                -

                  237,268

       22

Compensation Accruals

 

 

                                -

                                -

                  895,742

                                -

                  895,742

       23

Reserves & Accruals

 

 

                                -

                                -

                     66,861

                                -

                     66,861

       24

Intangible amortization

 

 

                                -

                                -

                                -

                                -

                                -

       25

Pension / Postretirement Benefits

 

 

                                -

                                -

                  (67,853)

                                -

                  (67,853)

       26

Environmental Liability

 

 

                                -

                                -

                  491,773

                                -

                  491,773

       27

Interest Rate Hedge

 

 

                                -

                                -

                                -

                                -

                                -

       28

Customer Advances

 

 

                                -

                                -

                                -

                                -

                                -

       29

Excess Tax Depreciation / Other Property

                (717,749)

                                -

                                -

                (717,749)

                (717,749)

            (2,024,442)

            (2,742,191)

       30

Net Operating Loss

 

 

 

                                -

                (148,724)

                                -

                (148,724)

       31

Total Gas

                (717,749)

                                -

                (238,951)

                (956,700)

                  518,367

            (2,024,442)

            (1,506,075)

       32

Other (Specify)

                                -

                                -

                       1,719

                       1,719

                  131,649

                                -

                  131,649

       33

Subtotal

          (14,386,893)

                                -

                (237,232)

          (14,624,125)

            (9,293,580)

          (14,561,092)

          (23,854,672)

       34

Gross-up

            (3,824,364)

                                -

                  (63,062)

            (3,887,426)

            (2,470,446)

            (3,870,670)

            (6,341,116)

       35

Total

          (18,211,257)

                                -

                (300,294)

          (18,511,551)

          (11,764,026)

          (18,431,762)

          (30,195,788)

       36

               

       37

Other (Specify)

             

       38

QF Obligations

                                -

                                -

                                -

                                -

                                -

                                -

                                -

       39

NOL Carryforward

                                -

                                -

                                -

                                -

                                -

                                -

                                -

       40

AMT Credit Carryforward

                                -

                                -

                                -

                                -

                                -

                                -

                                -

       41

Production Tax Credit

                                -

                                -

                                -

                                -

                                -

                                -

                                -

       42

Regulatory Assets / Liabilities

                                -

                                -

                                -

                                -

                                -

                                -

                                -

       43

Other, net

                                -

                                -

                       1,719

                       1,719

                  131,649

                                -

                  131,649

       44

Total

                                -

                                -

                       1,719

                       1,719

                  131,649

                                -

                  131,649

       45

               

       46

               

       47

 

12/31/2024

       48

 

Protected

Unprotected

Unprotected

   

Normalizing EDIT

 

       49

TCJA Excess ADIT Account Reduced

282

282

283

Subtotal

Total of 182.3

Subtotal

282

       50

Reg Asset Acccount Impacted

254

254

254

254

and 254

182.3

254

       51

Electric:

             

       52

Regulatory Assets / Liabilities

 

 

                                -

                                -

                                -

                                -

                                -

       53

Unbilled Revenue

 

 

                                -

                                -

                                -

                                -

                                -

       54

Compensation Accruals

 

 

                                -

                                -

                                -

                                -

                                -

       55

Reserves & Accruals

 

 

                                -

                                -

                                -

                                -

                                -

       56

Intangible amortization

 

 

                                -

                                -

                                -

                                -

                                -

       57

Pension / Postretirement Benefits

 

 

                                -

                                -

                                -

                                -

                                -

       58

Environmental Liability

 

 

                                -

                                -

                                -

                                -

                                -

       59

Interest Rate Hedge

 

 

                                -

                                -

                                -

                                -

                                -

       60

Customer Advances

 

 

                                -

                                -

                                -

                                -

                                -

       61

Excess Tax Depreciation / Other Property

          (13,207,310)

                                -

                                -

          (13,207,310)

          (13,207,310)

          (12,071,806)

          (25,279,116)

       62

Net Operating Loss

 

 

 

                                -

               3,587,409

                                -

               3,587,409

       63

Total Electric

          (13,207,310)

                                -

                                -

          (13,207,310)

            (9,619,901)

          (12,071,806)

          (21,691,707)

       64

Gas:

             

       65

Regulatory Assets / Liabilities

 

 

                (238,951)

                (238,951)

                (238,951)

                                -

                (238,951)

       66

Unbilled Revenue

 

 

                                -

                                -

                  237,268

                                -

                  237,268

       67

Compensation Accruals

 

 

                                -

                                -

                  895,742

                                -

                  895,742

       68

Reserves & Accruals

 

 

                                -

                                -

                     66,862

                                -

                     66,862

       69

Intangible amortization

 

 

                                -

                                -

                                -

                                -

                                -

       70

Pension / Postretirement Benefits

 

 

                                -

                                -

                  (67,853)

                                -

                  (67,853)

       71

Environmental Liability

 

 

                                -

                                -

                  491,773

                                -

                  491,773

       72

Interest Rate Hedge

 

 

                                -

                                -

                                -

                                -

                                -

       73

Customer Advances

 

 

                                -

                                -

                                -

                                -

                                -

       74

Excess Tax Depreciation / Other Property

                  644,161

            (1,202,150)

                                -

                (557,989)

                (557,989)

            (1,949,378)

            (2,507,367)

       75

Net Operating Loss

 

 

 

                                -

                (143,211)

                                -

                (143,211)

       76

Total Gas

                  644,161

            (1,202,150)

                (238,951)

                (796,940)

                  683,641

            (1,949,378)

            (1,265,737)

       77

Other (Specify)

                                -

                                -

                       1,719

                       1,719

                  131,649

                                -

                  131,649

       78

Subtotal

          (12,563,149)

            (1,202,150)

                (237,232)

          (14,002,531)

            (8,804,611)

          (14,021,184)

          (22,825,795)

       79

Gross-up

            (3,339,570)

                (319,559)

                  (63,061)

            (3,722,190)

            (2,340,465)

            (3,727,151)

            (6,067,616)

       80

Total

          (15,902,719)

            (1,521,709)

                (300,293)

          (17,724,721)

          (11,145,076)

          (17,748,335)

          (28,893,411)

       81

               

       82

Other (Specify)

             

       83

QF Obligations

                                -

                                -

                                -

                                -

                                -

                                -

                                -

       84

NOL Carryforward

                                -

                                -

                                -

                                -

                                -

                                -

                                -

       85

AMT Credit Carryforward

                                -

                                -

                                -

                                -

                                -

                                -

                                -

       86

Production Tax Credit

                                -

                                -

                                -

                                -

                                -

                                -

                                -

       87

Regulatory Assets / Liabilities

                                -

                                -

                                -

                                -

                                -

                                -

                                -

       88

Other, net

                                -

                                -

                       1,719

                       1,719

                  131,649

                                -

                  131,649

       89

Total

                                -

                                -

                       1,719

                       1,719

                  131,649

                                -

                  131,649


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
Electric Operating Revenues
  1. The following instructions generally apply to the annual version of these pages. Do not report quarterly data in columns (c), (e), (f), and (g). Unbilled revenues and MWH related to unbilled revenues need not be reported separately as required in the annual version of these pages.
  2. Report below operating revenues for each prescribed account, and manufactured gas revenues in total.
  3. Report number of customers, columns (f) and (g), on the basis of meters, in addition to the number of flat rate accounts; except that where separate meter readings are added for billing purposes, one customer should be counted for each group of meters added. The average number of customers means the average of twelve figures at the close of each month.
  4. If increases or decreases from previous period (columns (c),(e), and (g)), are not derived from previously reported figures, explain any inconsistencies in a footnote.
  5. Disclose amounts of $250,000 or greater in a footnote for accounts 451, 456, and 457.2.
  6. Commercial and industrial Sales, Account 442, may be classified according to the basis of classification (Small or Commercial, and Large or Industrial) regularly used by the respondent if such basis of classification is not generally greater than 1000 Kw of demand. (See Account 442 of the Uniform System of Accounts. Explain basis of classification in a footnote.)
  7. See page 108, Important Changes During Period, for important new territory added and important rate increase or decreases.
  8. For Lines 2,4,5,and 6, see Page 304 for amounts relating to unbilled revenue by accounts.
  9. Include unmetered sales. Provide details of such Sales in a footnote.
Line No.
Title of Account
(a)
Operating Revenues Year to Date Quarterly/Annual
(b)
Operating Revenues Previous year (no Quarterly)
(c)
MEGAWATT HOURS SOLD Year to Date Quarterly/Annual
(d)
MEGAWATT HOURS SOLD Amount Previous year (no Quarterly)
(e)
AVG.NO. CUSTOMERS PER MONTH Current Year (no Quarterly)
(f)
AVG.NO. CUSTOMERS PER MONTH Previous Year (no Quarterly)
(g)
1
SalesOfElectricityHeadingAbstract
Sales of Electricity
2
ResidentialSalesAbstract
(440) Residential Sales
70,012,031
557,457
51,467
3
CommercialAndIndustrialSalesAbstract
(442) Commercial and Industrial Sales
4
CommercialSalesAbstract
Small (or Comm.) (See Instr. 4)
77,064,550
654,020
13,024
5
IndustrialSalesAbstract
Large (or Ind.) (See Instr. 4)
34,748,000
438,660
60
6
PublicStreetAndHighwayLightingAbstract
(444) Public Street and Highway Lighting
2,400,327
8,062
146
7
OtherSalesToPublicAuthoritiesAbstract
(445) Other Sales to Public Authorities
873,897
6,752
274
8
SalesToRailroadsAndRailwaysAbstract
(446) Sales to Railroads and Railways
9
InterdepartmentalSalesAbstract
(448) Interdepartmental Sales
10
SalesToUltimateConsumersAbstract
TOTAL Sales to Ultimate Consumers
185,098,805
1,664,951
64,971
11
SalesForResaleAbstract
(447) Sales for Resale
12
SalesOfElectricityAbstract
TOTAL Sales of Electricity
185,098,805
13
ProvisionForRateRefundsAbstract
(Less) (449.1) Provision for Rate Refunds
14
RevenuesNetOfProvisionForRefundsAbstract
TOTAL Revenues Before Prov. for Refunds
185,098,805
15
OtherOperatingRevenuesAbstract
Other Operating Revenues
16
ForfeitedDiscounts
(450) Forfeited Discounts
431,605
17
MiscellaneousServiceRevenues
(451) Miscellaneous Service Revenues
205,806
18
SalesOfWaterAndWaterPower
(453) Sales of Water and Water Power
19
RentFromElectricProperty
(454) Rent from Electric Property
(a)
189,559
20
InterdepartmentalRents
(455) Interdepartmental Rents
21
OtherElectricRevenue
(456) Other Electric Revenues
(b)
720,595
22
RevenuesFromTransmissionOfElectricityOfOthers
(456.1) Revenues from Transmission of Electricity of Others
6,991,223
23
RegionalTransmissionServiceRevenues
(457.1) Regional Control Service Revenues
24
MiscellaneousRevenue
(457.2) Miscellaneous Revenues
25
OtherMiscellaneousOperatingRevenues
Other Miscellaneous Operating Revenues
26
OtherOperatingRevenues
TOTAL Other Operating Revenues
8,538,788
27
ElectricOperatingRevenues
TOTAL Electric Operating Revenues
193,637,593
Line12, column (b) includes $
of unbilled revenues.
Line12, column (d) includes
MWH relating to unbilled revenues


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: RentFromElectricProperty

Rent from South Dakota electric property was $324,215 for 2023.

(b) Concept: OtherElectricRevenue

Other Electric Revenue (456)

SD

Steam Sales

 699,779

Sale of Materials

19,495

Miscellaneous

1,321

 

720,595


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
REGIONAL TRANSMISSION SERVICE REVENUES (Account 457.1)
  1. The respondent shall report below the revenue collected for each service (i.e., control area administration, market administration, etc.) performed pursuant to a Commission approved tariff. All amounts separately billed must be detailed below.
Line No.
Description of Service
(a)
Balance at End of Quarter 1
(b)
Balance at End of Quarter 2
(c)
Balance at End of Quarter 3
(d)
Balance at End of Year
(e)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
SALES OF ELECTRICITY BY RATE SCHEDULES
  1. Report below for each rate schedule in effect during the year the MWH of electricity sold, revenue, average number of customer, average Kwh per customer, and average revenue per Kwh, excluding date for Sales for Resale which is reported on Page 310.
  2. Provide a subheading and total for each prescribed operating revenue account in the sequence followed in "Electric Operating Revenues," Page 300. If the sales under any rate schedule are classified in more than one revenue account, List the rate schedule and sales data under each applicable revenue account subheading.
  3. Where the same customers are served under more than one rate schedule in the same revenue account classification (such as a general residential schedule and an off peak water heating schedule), the entries in column (d) for the special schedule should denote the duplication in number of reported customers.
  4. The average number of customers should be the number of bills rendered during the year divided by the number of billing periods during the year (12 if all billings are made monthly).
  5. For any rate schedule having a fuel adjustment clause state in a footnote the estimated additional revenue billed pursuant thereto.
  6. Report amount of unbilled revenue as of end of year for each applicable revenue account subheading.
Line No.
Number and Title of Rate Schedule
(a)
MWh Sold
(b)
Revenue
(c)
Average Number of Customers
(d)
KWh of Sales Per Customer
(e)
Revenue Per KWh Sold
(f)
1
SD 10 Residential
378,624
50,480,247
39,293
9,627
0.1335
2
SD 11 Residential
166,542
18,396,076
11,106
14,996
0.1105
3
SD 14 Resid Space Htg 2 Meters
12,103
853,783
1,025
11,808
0.0705
4
SD 15 Residential Dual-Fuel
63
4,255
7
9,009
0.0675
5
SD 95 Reddy Guard
485
277,670
36
13,469
0.5726
41 TOTAL Billed Residential Sales
557,457
70,012,031
51,467
10,831
0.1256
42 TOTAL Unbilled Rev. (See Instr. 6)
43 TOTAL
557,457
70,012,031
51,467
10,831
0.1256


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
SALES OF ELECTRICITY BY RATE SCHEDULES
  1. Report below for each rate schedule in effect during the year the MWH of electricity sold, revenue, average number of customer, average Kwh per customer, and average revenue per Kwh, excluding date for Sales for Resale which is reported on Page 310.
  2. Provide a subheading and total for each prescribed operating revenue account in the sequence followed in "Electric Operating Revenues," Page 300. If the sales under any rate schedule are classified in more than one revenue account, List the rate schedule and sales data under each applicable revenue account subheading.
  3. Where the same customers are served under more than one rate schedule in the same revenue account classification (such as a general residential schedule and an off peak water heating schedule), the entries in column (d) for the special schedule should denote the duplication in number of reported customers.
  4. The average number of customers should be the number of bills rendered during the year divided by the number of billing periods during the year (12 if all billings are made monthly).
  5. For any rate schedule having a fuel adjustment clause state in a footnote the estimated additional revenue billed pursuant thereto.
  6. Report amount of unbilled revenue as of end of year for each applicable revenue account subheading.
Line No.
Number and Title of Rate Schedule
(a)
MWh Sold
(b)
Revenue
(c)
Average Number of Customers
(d)
KWh of Sales Per Customer
(e)
Revenue Per KWh Sold
(f)
1
SD 16 Inter Irrigation
1,390
172,818
70
19,861
0.1243
2
SD 17 Irrigation Power
375
61,966
18
20,849
0.1651
3
SD 21 General Service
71,145
12,040,227
8,760
8,122
0.1692
4
SD 23 Comm Water Heat
560
55,377
58
9,662
0.0988
5
SD 24 Comm Space Heat
38,872
2,800,881
595
65,330
0.0721
6
SD 25 Comm Heating
35,566
3,825,455
768
46,310
0.1076
7
SD 33 Industrial Power
161,870
23,449,858
2,127
76,103
0.1449
8
SD 34 Industrial Power
341,808
33,675,840
426
802,366
0.0985
9
SD 70 Controlled Off-Peak
1,037
135,225
4
259,234
0.1304
10
SD 95 Reddy Guard
1,396
613,836
180
7,758
0.4396
11
Small Qual Facility Rider 38 P to P
233,067
18
0
0
41 TOTAL Billed Small or Commercial
654,020
77,064,550
13,024
50,216
0.1178
42 TOTAL Unbilled Rev. Small or Commercial (See Instr. 6)
43 TOTAL Small or Commercial
654,020
77,064,550
13,024
50,216
0.1178


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
SALES OF ELECTRICITY BY RATE SCHEDULES
  1. Report below for each rate schedule in effect during the year the MWH of electricity sold, revenue, average number of customer, average Kwh per customer, and average revenue per Kwh, excluding date for Sales for Resale which is reported on Page 310.
  2. Provide a subheading and total for each prescribed operating revenue account in the sequence followed in "Electric Operating Revenues," Page 300. If the sales under any rate schedule are classified in more than one revenue account, List the rate schedule and sales data under each applicable revenue account subheading.
  3. Where the same customers are served under more than one rate schedule in the same revenue account classification (such as a general residential schedule and an off peak water heating schedule), the entries in column (d) for the special schedule should denote the duplication in number of reported customers.
  4. The average number of customers should be the number of bills rendered during the year divided by the number of billing periods during the year (12 if all billings are made monthly).
  5. For any rate schedule having a fuel adjustment clause state in a footnote the estimated additional revenue billed pursuant thereto.
  6. Report amount of unbilled revenue as of end of year for each applicable revenue account subheading.
Line No.
Number and Title of Rate Schedule
(a)
MWh Sold
(b)
Revenue
(c)
Average Number of Customers
(d)
KWh of Sales Per Customer
(e)
Revenue Per KWh Sold
(f)
1
SD 34 Large Industrial
438,660
34,748,000
60
7,311,000
0.0792
41 TOTAL Billed Large (or Ind.) Sales
438,660
34,748,000
60
7,311,000
0.0792
42 TOTAL Unbilled Rev. Large (or Ind.) (See Instr. 6)
43 TOTAL Large (or Ind.)
438,660
34,748,000
60
7,311,000
0.0792


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
SALES OF ELECTRICITY BY RATE SCHEDULES
  1. Report below for each rate schedule in effect during the year the MWH of electricity sold, revenue, average number of customer, average Kwh per customer, and average revenue per Kwh, excluding date for Sales for Resale which is reported on Page 310.
  2. Provide a subheading and total for each prescribed operating revenue account in the sequence followed in "Electric Operating Revenues," Page 300. If the sales under any rate schedule are classified in more than one revenue account, List the rate schedule and sales data under each applicable revenue account subheading.
  3. Where the same customers are served under more than one rate schedule in the same revenue account classification (such as a general residential schedule and an off peak water heating schedule), the entries in column (d) for the special schedule should denote the duplication in number of reported customers.
  4. The average number of customers should be the number of bills rendered during the year divided by the number of billing periods during the year (12 if all billings are made monthly).
  5. For any rate schedule having a fuel adjustment clause state in a footnote the estimated additional revenue billed pursuant thereto.
  6. Report amount of unbilled revenue as of end of year for each applicable revenue account subheading.
Line No.
Number and Title of Rate Schedule
(a)
MWh Sold
(b)
Revenue
(c)
Average Number of Customers
(d)
KWh of Sales Per Customer
(e)
Revenue Per KWh Sold
(f)
1
SD 95 Public Lighting
8,062
2,400,327
146
55,219
0.2977
41 TOTAL Billed Public Street and Highway Lighting
8,062
2,400,327
146
55,219
0.2977
42 TOTAL Unbilled Rev. (See Instr. 6)
43 TOTAL
8,062
2,400,327
146
55,219
0.2977


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
SALES OF ELECTRICITY BY RATE SCHEDULES
  1. Report below for each rate schedule in effect during the year the MWH of electricity sold, revenue, average number of customer, average Kwh per customer, and average revenue per Kwh, excluding date for Sales for Resale which is reported on Page 310.
  2. Provide a subheading and total for each prescribed operating revenue account in the sequence followed in "Electric Operating Revenues," Page 300. If the sales under any rate schedule are classified in more than one revenue account, List the rate schedule and sales data under each applicable revenue account subheading.
  3. Where the same customers are served under more than one rate schedule in the same revenue account classification (such as a general residential schedule and an off peak water heating schedule), the entries in column (d) for the special schedule should denote the duplication in number of reported customers.
  4. The average number of customers should be the number of bills rendered during the year divided by the number of billing periods during the year (12 if all billings are made monthly).
  5. For any rate schedule having a fuel adjustment clause state in a footnote the estimated additional revenue billed pursuant thereto.
  6. Report amount of unbilled revenue as of end of year for each applicable revenue account subheading.
Line No.
Number and Title of Rate Schedule
(a)
MWh Sold
(b)
Revenue
(c)
Average Number of Customers
(d)
KWh of Sales Per Customer
(e)
Revenue Per KWh Sold
(f)
1
SD 41 Municiple Pumping
6,752
873,897
274
24,642
0.1294
41 TOTAL Billed Other Sales to Public Authorities
6,752
873,897
274
24,642
0.1294
42 TOTAL Unbilled Rev. (See Instr. 6)
43 TOTAL
6,752
873,897
274
24,642
0.1294


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
SALES OF ELECTRICITY BY RATE SCHEDULES
  1. Report below for each rate schedule in effect during the year the MWH of electricity sold, revenue, average number of customer, average Kwh per customer, and average revenue per Kwh, excluding date for Sales for Resale which is reported on Page 310.
  2. Provide a subheading and total for each prescribed operating revenue account in the sequence followed in "Electric Operating Revenues," Page 300. If the sales under any rate schedule are classified in more than one revenue account, List the rate schedule and sales data under each applicable revenue account subheading.
  3. Where the same customers are served under more than one rate schedule in the same revenue account classification (such as a general residential schedule and an off peak water heating schedule), the entries in column (d) for the special schedule should denote the duplication in number of reported customers.
  4. The average number of customers should be the number of bills rendered during the year divided by the number of billing periods during the year (12 if all billings are made monthly).
  5. For any rate schedule having a fuel adjustment clause state in a footnote the estimated additional revenue billed pursuant thereto.
  6. Report amount of unbilled revenue as of end of year for each applicable revenue account subheading.
Line No.
Number and Title of Rate Schedule
(a)
MWh Sold
(b)
Revenue
(c)
Average Number of Customers
(d)
KWh of Sales Per Customer
(e)
Revenue Per KWh Sold
(f)
1
Provision for Rate Refund
41 TOTAL Billed Provision For Rate Refunds
42 TOTAL Unbilled Rev. (See Instr. 6)
43 TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
SALES OF ELECTRICITY BY RATE SCHEDULES
  1. Report below for each rate schedule in effect during the year the MWH of electricity sold, revenue, average number of customer, average Kwh per customer, and average revenue per Kwh, excluding date for Sales for Resale which is reported on Page 310.
  2. Provide a subheading and total for each prescribed operating revenue account in the sequence followed in "Electric Operating Revenues," Page 300. If the sales under any rate schedule are classified in more than one revenue account, List the rate schedule and sales data under each applicable revenue account subheading.
  3. Where the same customers are served under more than one rate schedule in the same revenue account classification (such as a general residential schedule and an off peak water heating schedule), the entries in column (d) for the special schedule should denote the duplication in number of reported customers.
  4. The average number of customers should be the number of bills rendered during the year divided by the number of billing periods during the year (12 if all billings are made monthly).
  5. For any rate schedule having a fuel adjustment clause state in a footnote the estimated additional revenue billed pursuant thereto.
  6. Report amount of unbilled revenue as of end of year for each applicable revenue account subheading.
Line No.
Number and Title of Rate Schedule
(a)
MWh Sold
(b)
Revenue
(c)
Average Number of Customers
(d)
KWh of Sales Per Customer
(e)
Revenue Per KWh Sold
(f)
41 TOTAL Billed - All Accounts
1,664,951
185,098,805
64,971
25,626
0.1112
42 TOTAL Unbilled Rev. (See Instr. 6) - All Accounts
43 TOTAL - All Accounts
1,664,951
185,098,805
64,971
25,626
0.1112


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
SALES FOR RESALE (Account 447)
  1. Report all sales for resale (i.e., sales to purchasers other than ultimate consumers) transacted on a settlement basis other than power exchanges during the year. Do not report exchanges of electricity ( i.e., transactions involving a balancing of debits and credits for energy, capacity, etc.) and any settlements for imbalanced exchanges on this schedule. Power exchanges must be reported on the Purchased Power schedule (Page 326).
  2. Enter the name of the purchaser in column (a). Do note abbreviate or truncate the name or use acronyms. Explain in a footnote any ownership interest or affiliation the respondent has with the purchaser.
  3. In column (b), enter a Statistical Classification Code based on the original contractual terms and conditions of the service as follows:

    RQ - for requirements service. Requirements service is service which the supplier plans to provide on an ongoing basis (i.e., the supplier includes projected load for this service in its system resource planning). In addition, the reliability of requirements service must be the same as, or second only to, the supplier's service to its own ultimate consumers.

    LF - for tong-term service. "Long-term" means five years or Longer and "firm" means that service cannot be interrupted for economic reasons and is intended to remain reliable even under adverse conditions (e.g., the supplier must attempt to buy emergency energy from third parties to maintain deliveries of LF service). This category should not be used for Long-term firm service which meets the definition of RQ service. For all transactions identified as LF, provide in a footnote the termination date of the contract defined as the earliest date that either buyer or setter can unilaterally get out of the contract.

    IF - for intermediate-term firm service. The same as LF service except that "intermediate-term" means longer than one year but Less than five years.

    SF - for short-term firm service. Use this category for all firm services where the duration of each period of commitment for service is one year or less.

    LU - for Long-term service from a designated generating unit. "Long-term" means five years or Longer. The availability and reliability of service, aside from transmission constraints, must match the availability and reliability of designated unit.

    IU - for intermediate-term service from a designated generating unit. The same as LU service except that "intermediate-term" means Longer than one year but Less than five years.

    OS - for other service. use this category only for those services which cannot be placed in the above-defined categories, such as all non-firm service regardless of the Length of the contract and service from designated units of Less than one year. Describe the nature of the service in a footnote.

    AD - for Out-of-period adjustment. Use this code for any accounting adjustments or "true-ups" for service provided in prior reporting years. Provide an explanation in a footnote for each adjustment.

  4. Group requirements RQ sales together and report them starting at line number one. After listing all RQ sales, enter "Subtotal - RQ" in column (a). The remaining sales may then be listed in any order. Enter "Subtotal-Non-RQ" in column (a) after this Listing. Enter "Total'' in column (a) as the Last Line of the schedule. Report subtotals and total for columns (g) through (k).
  5. In Column (c), identify the FERC Rate Schedule or Tariff Number. On separate Lines, List all FERC rate schedules or tariffs under which service, as identified in column (b), is provided.
  6. For requirements RQ sales and any type of-service involving demand charges imposed on a monthly (or Longer) basis, enter the average monthly billing demand in column (d), the average monthly non-coincident peak (NCP) demand in column (e), and the average monthly coincident peak (CP) demand in column (f). For all other types of service, enter NA in columns (d), (e) and (f). Monthly NCP demand is the maximum metered hourly (60-minute integration) demand in a month. Monthly CP demand is the metered demand during the hour (60-minute integration) in which the supplier's system reaches its monthly peak. Demand reported in columns (e) and (f) must be in megawatts. Footnote any demand not stated on a megawatt basis and explain.
  7. Report in column (g) the megawatt hours shown on bills rendered to the purchaser.
  8. Report demand charges in column (h), energy charges in column (i), and the total of any other types of charges, including out-of-period adjustments, in column (j). Explain in a footnote all components of the amount shown in column (j). Report in column (k) the total charge shown on bills rendered to the purchaser.
  9. The data in column (g) through (k) must be subtotaled based on the RQ/Non-RQ grouping (see instruction 4), and then totaled on the Last -line of the schedule. The "Subtotal - RQ" amount in column (g) must be reported as Requirements Sales For Resale on Page 401, line 23. The "Subtotal - Non-RQ" amount in column (g) must be reported as Non-Requirements Sales For Resale on Page 401,line 24.
  10. Footnote entries as required and provide explanations following all required data.
ACTUAL DEMAND (MW) REVENUE
Line No.
Name of Company or Public Authority (Footnote Affiliations)
(a)
Statistical Classification
(b)
FERC Rate Schedule or Tariff Number
(c)
Average Monthly Billing Demand (MW)
(d)
Average Monthly NCP Demand
(e)
Average Monthly CP Demand
(f)
Megawatt Hours Sold
(g)
Demand Charges ($)
(h)
Energy Charges ($)
(i)
Other Charges ($)
(j)
Total ($) (h+i+j)
(k)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Subtotal - RQ
16
Subtotal-Non-RQ
17 Total


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
ELECTRIC OPERATION AND MAINTENANCE EXPENSES

If the amount for previous year is not derived from previously reported figures, explain in footnote.

Line No.
Account
(a)
Amount for Current Year
(b)
Amount for Previous Year (c)
(c)
1
PowerProductionExpensesAbstract
1. POWER PRODUCTION EXPENSES
2
SteamPowerGenerationAbstract
A. Steam Power Generation
3
SteamPowerGenerationOperationAbstract
Operation
4
OperationSupervisionAndEngineeringSteamPowerGeneration
(500) Operation Supervision and Engineering
(a)
797,853
0
5
FuelSteamPowerGeneration
(501) Fuel
19,909,740
0
6
SteamExpensesSteamPowerGeneration
(502) Steam Expenses
1,326,668
0
7
SteamFromOtherSources
(503) Steam from Other Sources
0
0
8
SteamTransferredCredit
(Less) (504) Steam Transferred-Cr.
0
0
9
ElectricExpensesSteamPowerGeneration
(505) Electric Expenses
648,319
0
10
MiscellaneousSteamPowerExpenses
(506) Miscellaneous Steam Power Expenses
1,157,423
0
11
RentsSteamPowerGeneration
(507) Rents
37,478
0
12
Allowances
(509) Allowances
0
0
13
SteamPowerGenerationOperationsExpense
TOTAL Operation (Enter Total of Lines 4 thru 12)
23,877,481
0
14
SteamPowerGenerationMaintenanceAbstract
Maintenance
15
MaintenanceSupervisionAndEngineeringSteamPowerGeneration
(510) Maintenance Supervision and Engineering
369,992
0
16
MaintenanceOfStructuresSteamPowerGeneration
(511) Maintenance of Structures
337,820
0
17
MaintenanceOfBoilerPlantSteamPowerGeneration
(512) Maintenance of Boiler Plant
2,752,687
0
18
MaintenanceOfElectricPlantSteamPowerGeneration
(513) Maintenance of Electric Plant
306,593
0
19
MaintenanceOfMiscellaneousSteamPlant
(514) Maintenance of Miscellaneous Steam Plant
475,329
0
20
SteamPowerGenerationMaintenanceExpense
TOTAL Maintenance (Enter Total of Lines 15 thru 19)
4,242,421
0
21
PowerProductionExpensesSteamPower
TOTAL Power Production Expenses-Steam Power (Enter Total of Lines 13 & 20)
28,119,902
0
22
NuclearPowerGenerationAbstract
B. Nuclear Power Generation
23
NuclearPowerGenerationOperationAbstract
Operation
24
OperationSupervisionAndEngineeringNuclearPowerGeneration
(517) Operation Supervision and Engineering
0
0
25
NuclearFuelExpense
(518) Fuel
0
0
26
CoolantsAndWater
(519) Coolants and Water
0
0
27
SteamExpensesNuclearPowerGeneration
(520) Steam Expenses
0
0
28
SteamFromOtherSourcesNuclearPowerGeneration
(521) Steam from Other Sources
0
0
29
SteamTransferredCreditNuclearPowerGeneration
(Less) (522) Steam Transferred-Cr.
0
0
30
ElectricExpensesNuclearPowerGeneration
(523) Electric Expenses
0
0
31
MiscellaneousNuclearPowerExpenses
(524) Miscellaneous Nuclear Power Expenses
0
0
32
RentsNuclearPowerGeneration
(525) Rents
0
0
33
NuclearPowerGenerationOperationsExpense
TOTAL Operation (Enter Total of lines 24 thru 32)
0
0
34
NuclearPowerGenerationMaintenanceAbstract
Maintenance
35
MaintenanceSupervisionAndEngineeringNuclearPowerGeneration
(528) Maintenance Supervision and Engineering
0
0
36
MaintenanceOfStructuresNuclearPowerGeneration
(529) Maintenance of Structures
0
0
37
MaintenanceOfReactorPlantEquipmentNuclearPowerGeneration
(530) Maintenance of Reactor Plant Equipment
0
0
38
MaintenanceOfElectricPlantNuclearPowerGeneration
(531) Maintenance of Electric Plant
0
0
39
MaintenanceOfMiscellaneousNuclearPlant
(532) Maintenance of Miscellaneous Nuclear Plant
0
0
40
NuclearPowerGenerationMaintenanceExpense
TOTAL Maintenance (Enter Total of lines 35 thru 39)
0
0
41
PowerProductionExpensesNuclearPower
TOTAL Power Production Expenses-Nuclear. Power (Enter Total of lines 33 & 40)
0
0
42
HydraulicPowerGenerationAbstract
C. Hydraulic Power Generation
43
HydraulicPowerGenerationOperationAbstract
Operation
44
OperationSupervisionAndEngineeringHydraulicPowerGeneration
(535) Operation Supervision and Engineering
0
0
45
WaterForPower
(536) Water for Power
0
0
46
HydraulicExpenses
(537) Hydraulic Expenses
0
0
47
ElectricExpensesHydraulicPowerGeneration
(538) Electric Expenses
0
0
48
MiscellaneousHydraulicPowerGenerationExpenses
(539) Miscellaneous Hydraulic Power Generation Expenses
0
0
49
RentsHydraulicPowerGeneration
(540) Rents
0
0
50
HydraulicPowerGenerationOperationsExpense
TOTAL Operation (Enter Total of Lines 44 thru 49)
0
0
51
HydraulicPowerGenerationContinuedAbstract
C. Hydraulic Power Generation (Continued)
52
HydraulicPowerGenerationMaintenanceAbstract
Maintenance
53
MaintenanceSupervisionAndEngineeringHydraulicPowerGeneration
(541) Mainentance Supervision and Engineering
0
0
54
MaintenanceOfStructuresHydraulicPowerGeneration
(542) Maintenance of Structures
0
0
55
MaintenanceOfReservoirsDamsAndWaterways
(543) Maintenance of Reservoirs, Dams, and Waterways
0
0
56
MaintenanceOfElectricPlantHydraulicPowerGeneration
(544) Maintenance of Electric Plant
0
0
57
MaintenanceOfMiscellaneousHydraulicPlant
(545) Maintenance of Miscellaneous Hydraulic Plant
0
0
58
HydraulicPowerGenerationMaintenanceExpense
TOTAL Maintenance (Enter Total of lines 53 thru 57)
0
0
59
PowerProductionExpensesHydraulicPower
TOTAL Power Production Expenses-Hydraulic Power (Total of Lines 50 & 58)
0
0
60
OtherPowerGenerationAbstract
D. Other Power Generation
61
OtherPowerGenerationOperationAbstract
Operation
62
OperationSupervisionAndEngineeringOtherPowerGeneration
(546) Operation Supervision and Engineering
124,354
0
63
Fuel
(547) Fuel
4,674,299
0
64
GenerationExpenses
(548) Generation Expenses
4,801,586
0
64.1
OperationOfEnergyStorageEquipment
(548.1) Operation of Energy Storage Equipment
0
1
65
MiscellaneousOtherPowerGenerationExpenses
(549) Miscellaneous Other Power Generation Expenses
455,772
0
66
RentsOtherPowerGeneration
(550) Rents
0
0
67
OtherPowerGenerationOperationsExpense
TOTAL Operation (Enter Total of Lines 62 thru 67)
10,056,011
0
68
OtherPowerGenerationMaintenanceAbstract
Maintenance
69
MaintenanceSupervisionAndEngineeringOtherPowerGeneration
(551) Maintenance Supervision and Engineering
46,829
0
70
MaintenanceOfStructures
(552) Maintenance of Structures
0
0
71
MaintenanceOfGeneratingAndElectricPlant
(553) Maintenance of Generating and Electric Plant
1,325,699
0
71.1
MaintenanceOfEnergyStorageEquipmentOtherPowerGeneration
(553.1) Maintenance of Energy Storage Equipment
0
1
72
MaintenanceOfMiscellaneousOtherPowerGenerationPlant
(554) Maintenance of Miscellaneous Other Power Generation Plant
33,765
0
73
OtherPowerGenerationMaintenanceExpense
TOTAL Maintenance (Enter Total of Lines 69 thru 72)
1,406,293
0
74
PowerProductionExpensesOtherPower
TOTAL Power Production Expenses-Other Power (Enter Total of Lines 67 & 73)
11,462,304
0
75
OtherPowerSuplyExpensesAbstract
E. Other Power Supply Expenses
76
PurchasedPower
(555) Purchased Power
19,278,652
0
76.1
PowerPurchasedForStorageOperations
(555.1) Power Purchased for Storage Operations
0
0
77
SystemControlAndLoadDispatchingElectric
(556) System Control and Load Dispatching
264,838
0
78
OtherExpensesOtherPowerSupplyExpenses
(557) Other Expenses
2,434,072
0
79
OtherPowerSupplyExpense
TOTAL Other Power Supply Exp (Enter Total of Lines 76 thru 78)
17,109,418
0
80
PowerProductionExpenses
TOTAL Power Production Expenses (Total of Lines 21, 41, 59, 74 & 79)
56,691,624
0
81
TransmissionExpensesAbstract
2. TRANSMISSION EXPENSES
82
TransmissionExpensesOperationAbstract
Operation
83
OperationSupervisionAndEngineeringElectricTransmissionExpenses
(560) Operation Supervision and Engineering
201,949
0
85
LoadDispatchReliability
(561.1) Load Dispatch-Reliability
60,845
0
86
LoadDispatchMonitorAndOperateTransmissionSystem
(561.2) Load Dispatch-Monitor and Operate Transmission System
0
0
87
LoadDispatchTransmissionServiceAndScheduling
(561.3) Load Dispatch-Transmission Service and Scheduling
3,000
0
88
SchedulingSystemControlAndDispatchServices
(561.4) Scheduling, System Control and Dispatch Services
0
0
89
ReliabilityPlanningAndStandardsDevelopment
(561.5) Reliability, Planning and Standards Development
118,331
0
90
TransmissionServiceStudies
(561.6) Transmission Service Studies
0
0
91
GenerationInterconnectionStudies
(561.7) Generation Interconnection Studies
0
0
92
ReliabilityPlanningAndStandardsDevelopmentServices
(561.8) Reliability, Planning and Standards Development Services
0
0
93
StationExpensesTransmissionExpense
(562) Station Expenses
328,545
0
93.1
OperationOfEnergyStorageEquipmentTransmissionExpense
(562.1) Operation of Energy Storage Equipment
0
0
94
OverheadLineExpense
(563) Overhead Lines Expenses
242,692
0
95
UndergroundLineExpensesTransmissionExpense
(564) Underground Lines Expenses
0
0
96
TransmissionOfElectricityByOthers
(565) Transmission of Electricity by Others
18,874,675
0
97
MiscellaneousTransmissionExpenses
(566) Miscellaneous Transmission Expenses
81,922
0
98
RentsTransmissionElectricExpense
(567) Rents
19,732
0
99
TransmissionOperationExpense
TOTAL Operation (Enter Total of Lines 83 thru 98)
19,931,691
0
100
TransmissionMaintenanceAbstract
Maintenance
101
MaintenanceSupervisionAndEngineeringElectricTransmissionExpenses
(568) Maintenance Supervision and Engineering
78,564
0
102
MaintenanceOfStructuresTransmissionExpense
(569) Maintenance of Structures
1,180
0
103
MaintenanceOfComputerHardwareTransmission
(569.1) Maintenance of Computer Hardware
0
0
104
MaintenanceOfComputerSoftwareTransmission
(569.2) Maintenance of Computer Software
0
0
105
MaintenanceOfCommunicationEquipmentElectricTransmission
(569.3) Maintenance of Communication Equipment
0
0
106
MaintenanceOfMiscellaneousRegionalTransmissionPlant
(569.4) Maintenance of Miscellaneous Regional Transmission Plant
0
0
107
MaintenanceOfStationEquipmentTransmission
(570) Maintenance of Station Equipment
60,151
0
107.1
MaintenanceOfEnergyStorageEquipmentTransmission
(570.1) Maintenance of Energy Storage Equipment
0
0
108
MaintenanceOfOverheadLinesTransmission
(571) Maintenance of Overhead Lines
195,781
0
109
MaintenanceOfUndergroundLinesTransmission
(572) Maintenance of Underground Lines
0
0
110
MaintenanceOfMiscellaneousTransmissionPlant
(573) Maintenance of Miscellaneous Transmission Plant
0
1
111
TransmissionMaintenanceExpenseElectric
TOTAL Maintenance (Total of Lines 101 thru 110)
335,676
0
112
TransmissionExpenses
TOTAL Transmission Expenses (Total of Lines 99 and 111)
20,267,367
0
113
RegionalMarketExpensesAbstract
3. REGIONAL MARKET EXPENSES
114
RegionalMarketExpensesOperationAbstract
Operation
115
OperationSupervision
(575.1) Operation Supervision
0
0
116
DayAheadAndRealTimeMarketAdministration
(575.2) Day-Ahead and Real-Time Market Facilitation
355,300
0
117
TransmissionRightsMarketAdministration
(575.3) Transmission Rights Market Facilitation
0
0
118
CapacityMarketAdministration
(575.4) Capacity Market Facilitation
0
0
119
AncillaryServicesMarketAdministration
(575.5) Ancillary Services Market Facilitation
101,515
0
120
MarketMonitoringAndCompliance
(575.6) Market Monitoring and Compliance
50,757
0
121
MarketFacilitationMonitoringAndComplianceServices
(575.7) Market Facilitation, Monitoring and Compliance Services
0
0
122
RentsRegionalMarketExpenses
(575.8) Rents
0
0
123
RegionalMarketOperationExpense
Total Operation (Lines 115 thru 122)
507,572
0
124
RegionalMarketExpensesMaintenanceAbstract
Maintenance
125
MaintenanceOfStructuresAndImprovementsRegionalMarketExpenses
(576.1) Maintenance of Structures and Improvements
0
0
126
MaintenanceOfComputerHardware
(576.2) Maintenance of Computer Hardware
0
0
127
MaintenanceOfComputerSoftware
(576.3) Maintenance of Computer Software
0
0
128
MaintenanceOfCommunicationEquipmentRegionalMarketExpenses
(576.4) Maintenance of Communication Equipment
0
0
129
MaintenanceOfMiscellaneousMarketOperationPlant
(576.5) Maintenance of Miscellaneous Market Operation Plant
0
0
130
RegionalMarketMaintenanceExpense
Total Maintenance (Lines 125 thru 129)
0
0
131
RegionalMarketExpenses
TOTAL Regional Transmission and Market Operation Expenses (Enter Total of Lines 123 and 130)
507,572
0
132
DistributionExpensesAbstract
4. DISTRIBUTION EXPENSES
133
DistributionExpensesOperationAbstract
Operation
134
OperationSupervisionAndEngineeringDistributionExpense
(580) Operation Supervision and Engineering
462,610
0
135
LoadDispatching
(581) Load Dispatching
0
0
136
StationExpensesDistribution
(582) Station Expenses
272,616
0
137
OverheadLineExpenses
(583) Overhead Line Expenses
291,024
0
138
UndergroundLineExpenses
(584) Underground Line Expenses
628,535
0
138.1
OperationOfEnergyStorageEquipmentDistribution
(584.1) Operation of Energy Storage Equipment
0
0
139
StreetLightingAndSignalSystemExpenses
(585) Street Lighting and Signal System Expenses
16,356
0
140
MeterExpenses
(586) Meter Expenses
272,087
0
141
CustomerInstallationsExpenses
(587) Customer Installations Expenses
173,104
0
142
MiscellaneousDistributionExpenses
(588) Miscellaneous Expenses
595,516
0
143
RentsDistributionExpense
(589) Rents
0
0
144
DistributionOperationExpensesElectric
TOTAL Operation (Enter Total of Lines 134 thru 143)
2,711,848
0
145
DistributionExpensesMaintenanceAbstract
Maintenance
146
MaintenanceSupervisionAndEngineering
(590) Maintenance Supervision and Engineering
278,163
0
147
MaintenanceOfStructuresDistributionExpense
(591) Maintenance of Structures
0
0
148
MaintenanceOfStationEquipment
(592) Maintenance of Station Equipment
107,921
0
148.1
MaintenanceOfEnergyStorageEquipment
(592.2) Maintenance of Energy Storage Equipment
0
1
149
MaintenanceOfOverheadLines
(593) Maintenance of Overhead Lines
1,732,180
0
150
MaintenanceOfUndergroundLines
(594) Maintenance of Underground Lines
205,035
0
151
MaintenanceOfLineTransformers
(595) Maintenance of Line Transformers
23,928
0
152
MaintenanceOfStreetLightingAndSignalSystems
(596) Maintenance of Street Lighting and Signal Systems
111,767
0
153
MaintenanceOfMeters
(597) Maintenance of Meters
353,009
0
154
MaintenanceOfMiscellaneousDistributionPlant
(598) Maintenance of Miscellaneous Distribution Plant
11,833
0
155
DistributionMaintenanceExpenseElectric
TOTAL Maintenance (Total of Lines 146 thru 154)
2,823,836
0
156
DistributionExpenses
TOTAL Distribution Expenses (Total of Lines 144 and 155)
5,535,684
0
157
CustomerAccountsExpensesAbstract
5. CUSTOMER ACCOUNTS EXPENSES
158
CustomerAccountsExpensesOperationsAbstract
Operation
159
SupervisionCustomerAccountExpenses
(901) Supervision
0
0
160
MeterReadingExpenses
(902) Meter Reading Expenses
48,847
0
161
CustomerRecordsAndCollectionExpenses
(903) Customer Records and Collection Expenses
1,324,703
0
162
UncollectibleAccounts
(904) Uncollectible Accounts
97,870
0
163
MiscellaneousCustomerAccountsExpenses
(905) Miscellaneous Customer Accounts Expenses
50,105
0
164
CustomerAccountExpenses
TOTAL Customer Accounts Expenses (Enter Total of Lines 159 thru 163)
1,521,525
0
165
CustomerServiceAndInformationalExpensesAbstract
6. CUSTOMER SERVICE AND INFORMATIONAL EXPENSES
166
CustomerServiceAndInformationalExpensesOperationAbstract
Operation
167
SupervisionCustomerServiceAndInformationExpenses
(907) Supervision
0
0
168
CustomerAssistanceExpenses
(908) Customer Assistance Expenses
906,535
0
169
InformationalAndInstructionalAdvertisingExpenses
(909) Informational and Instructional Expenses
43,522
0
170
MiscellaneousCustomerServiceAndInformationalExpenses
(910) Miscellaneous Customer Service and Informational Expenses
106,116
0
171
CustomerServiceAndInformationExpenses
TOTAL Customer Service and Information Expenses (Total Lines 167 thru 170)
1,056,173
0
172
SalesExpenseAbstract
7. SALES EXPENSES
173
SalesExpenseOperationAbstract
Operation
174
SupervisionSalesExpense
(911) Supervision
0
0
175
DemonstratingAndSellingExpenses
(912) Demonstrating and Selling Expenses
0
0
176
AdvertisingExpenses
(913) Advertising Expenses
38,114
0
177
MiscellaneousSalesExpenses
(916) Miscellaneous Sales Expenses
0
0
178
SalesExpenses
TOTAL Sales Expenses (Enter Total of Lines 174 thru 177)
38,114
0
179
AdministrativeAndGeneralExpensesAbstract
8. ADMINISTRATIVE AND GENERAL EXPENSES
180
AdministrativeAndGeneralExpensesOperationAbstract
Operation
181
AdministrativeAndGeneralSalaries
(920) Administrative and General Salaries
4,524,441
0
182
OfficeSuppliesAndExpenses
(921) Office Supplies and Expenses
2,611,946
0
183
AdministrativeExpensesTransferredCredit
(Less) (922) Administrative Expenses Transferred-Credit
1,430,796
0
184
OutsideServicesEmployed
(923) Outside Services Employed
1,471,843
0
185
PropertyInsurance
(924) Property Insurance
548,950
0
186
InjuriesAndDamages
(925) Injuries and Damages
1,958,886
0
187
EmployeePensionsAndBenefits
(926) Employee Pensions and Benefits
3,438,109
0
188
FranchiseRequirements
(927) Franchise Requirements
0
0
189
RegulatoryCommissionExpenses
(928) Regulatory Commission Expenses
81,138
0
190
DuplicateChargesCredit
(929) (Less) Duplicate Charges-Cr.
0
0
191
GeneralAdvertisingExpenses
(930.1) General Advertising Expenses
79,060
0
192
MiscellaneousGeneralExpenses
(930.2) Miscellaneous General Expenses
(b)
619,780
0
193
RentsAdministrativeAndGeneralExpense
(931) Rents
71,367
0
194
AdministrativeAndGeneralOperationExpense
TOTAL Operation (Enter Total of Lines 181 thru 193)
13,974,725
0
195
AdministrativeAndGeneralExpensesMaintenanceAbstract
Maintenance
196
MaintenanceOfGeneralPlant
(935) Maintenance of General Plant
616,280
0
197
AdministrativeAndGeneralExpenses
TOTAL Administrative & General Expenses (Total of Lines 194 and 196)
14,591,005
0
198
OperationsAndMaintenanceExpensesElectric
TOTAL Electric Operation and Maintenance Expenses (Total of Lines 80, 112, 131, 156, 164, 171, 178, and 197)
100,209,064
0


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: OperationSupervisionAndEngineeringSteamPowerGeneration
On January 1, 2024, NorthWestern Corporation contributed the assets and liabilities of its South Dakota and Nebraska regualted utilities to NorthWestern Energy Public Service Corporation. The amounts below are the results for the South Dakota operations for the year ended December 31, 2023, while under NorthWestern Corporation's ownership.

 

  SOUTH DAKOTA OPERATIONS ONLY
Line No. Account
(a)
Amount for Prior Year
(b)
1 1. POWER PRODUCTION EXPENSES  
2 A. Steam Power Generation  
3 Operation  
4 500 Operation supervision and engineering 729,331   
5 501 Fuel 18,054,713   
6 502 Steam expenses 1,376,881   
7 503 Steam from other sources  
8 504 Less: Steam transferred-Cr  
9 505 Electric expenses 563,485   
10 506 Miscellaneous steam power expenses 1,347,952   
11 507 Rents 29,911   
12 509 Allowances  
13 Total Operation 22,102,273   
14 Maintenance  
15 510 Maintenance supervision and engineering 625,842   
16 511 Maintenance of structures 328,576   
17 512 Maintenance of boiler plant 2,325,108   
18 513 Maintenance of electric plant 981,821   
19 514 Maintenance of miscellaneous steam plant 556,304   
20 Total maintenance 4,817,651   
21 Total Power Production Expenses-Steam Power 26,919,924   
22 B. Nuclear Power Generation  
23 Operation  
24 517 Operation supervision and engineering  
25 518 Fuel  
26 519 Coolants and water  
27 520 Steam expenses  
28 521 Steam from other sources  
29 522 Less: Steam transferred-Cr  
30 523 Electric expenses  
31 524 Miscellaneous nuclear power expenses  
32 525 Rents  
33 Total Operation —   
34 Maintenance  
35 528 Maintenance supervision and engineering  
36 529 Maintenance of structures  
37 530 Maintenance of Reactor Plant Equipment  
38 531 Maintenance of electric plant  
39 532 Maintenance of miscellaneous nuclear plant  
40 Total maintenance —   
41 Total Power Production Expenses-Nuc. Power —   
42 C. Hydraulic Power Generation  
43 Operation  
44 535 Operation supervision and engineering  
45 536 Water for power  
46 537 Hydraulic expenses  
47 538 Electric expenses  
48 539 Miscellaneous hydraulic power generation expenses  
49 540 Rents  
50 Total Operation —   
                 
51 C. Hydraulic Power Generation (continued)  
52 Hydraulic Power Generation - Maintenance  
53 541 Maintenance supervision and engineering  
54 542 Maintenance of structures  
55 543 Maintenance of reservoirs, dams and waterways  
56 544 Maintenance of electric plant  
57 545 Maintenance of miscellaneous hydraulic plant  
58 Total Maintenance —   
59 Total power production expenses-hydraulic power —   
     
60 D. Other Power Generation  
61 Operation  
62 546 Operation supervision and engineering 133,892   
63 547 Fuel 5,275,105   
64 548 Generation expenses 4,749,809   
65 549 Miscellaneous other power generation expenses 509,030   
66 550 Rents —   
67 Total Operation 10,667,836   
68 Maintenance  
69 551 Maintenance supervision and engineering 63,598   
70 552 Maintenance of structures 105,114   
71 553 Maintenance of generating and electric plant 1,186,171   
72 554 Maintenance of miscellaneous other power generating plant 52,600   
73 Total Maintenance 1,407,483   
74 Total power production expenses-other power 12,075,319   
75 E. Other Power Supply Expenses  
76 555 Purchased power 19,557,361   
77 556 System control and load dispatching 348,013   
78 557 Other expenses 4,903,905   
79 Total other power supply exp 24,809,279   
80 Total power production expenses 63,804,523   
81 2. Transmission Expenses  
82 Operation  
83 560 Operation supervision and engineering 184,127   
84 561 Load dispatching 65,111   
85 561.1 Load dispatch-reliability —   
86 561.2 Load dispatch-monitor and operate transmission system —   
87 561.3 Load dispatch-transmission service and scheduling 3,000   
88 561.4 Scheduling, system control and dispatch services  
89 561.5 Reliability, planning and standards development 105,401   
90 561.6 Transmission service studies  
91 561.7 Generation interconnection studies  
92 561.8 Reliability, planning and standards development services  
93 562 Station expenses 191,865   
94 563 Overhead line expenses 186,678   
95 564 Underground line expenses  
96 565 Transmission of electricity by others 19,298,804   
97 566 Miscellaneous transmission expense 73,602   
98 567 Rents 17,295   
99 Total Operation 20,125,883   
100 Maintenance  
101 568 Maintenance supervision and engineering 93,684   
102 569 Maintenance of structures 12,698   
103 569.1 Maintenance of computer hardware —   
104 569.2 Maintenance of computer software —   
                 
105 569.3 Maintenance of communication equipment —   
106 569.4 Maintenance of miscellaneous regional transmission plant  
107 570 Maintenance of station equipment 16,542   
108 571 Maintenance of overhead lines 270,123   
109 572 Maintenance of underground lines 188   
110 573 Maintenance of miscellaneous transmission plant  
111 Total Maintenance 393,235   
112 Total transmission expenses 20,519,118   
     
113 3. Regional Market Expenses  
114 Operation  
115 575.1 Operation supervision  
116 575.2 Day-ahead and real-time market facilitation 388,799   
117 575.3 Transmission rights market facilitation  
118 575.4 Capacity market facilitation  
119 575.5 Ancillary services market facilitation 111,085   
120 575.6 Market monitoring and compliance 55,543   
121 575.7 Market facilitation, monitoring and compliance services  
122 575.8 Rents  
123 Total Operation 555,427   
124 Maintenance  
125 576.1 Maintenance of structures and improvements  
126 576.2 Maintenance of computer hardware  
127 576.3 Maintenance of computer software  
128 576.4 Maintenance of communication equipment  
129 576.5 Maintenance of miscellaneous market operation plant  
130 Total Maintenance —   
131 Total Regional Transmission and Market Op. Expns. —   
132 4. Distribution Expenses  
133 Operation  
134 580 Operations supervision and engineering 514,270   
135 581 Load dispatching  
136 582 Station expenses 252,665   
137 583 Overhead line expenses 425,915   
138 584 Underground line expenses 536,374   
139 585 Street lighting and signal system expenses 43,509   
140 586 Meter expenses 333,297   
141 587 Customer installation expenses 176,103   
142 588 Miscellaneous distribution expenses 874,831   
143 589 Rents —   
144 Total Operation 3,156,964   
145 Maintenance  
146 590 Maintenance supervision and engineering 244,074   
147 591 Maintenance of structures  
148 592 Maintenance of station equipment 133,575   
149 593 Maintenance of overhead lines 1,778,854   
150 594 Maintenance of underground lines 216,013   
151 595 Maintenance of line transformers 40,283   
152 596 Maintenance of street lighting and signal systems 197,334   
153 597 Maintenance of meters 212,006   
154 598 Maintenance of miscellaneous distribution plant 19,443   
155 Total Maintenance 2,841,582   
156 Total distribution expenses 5,998,546   
157 5. Customer Accounts Expenses  
158 Operation  
                 
159 901 Supervision  
160 902 Meter reading expenses 52,098   
161 903 Customer records and collection expenses 1,125,435   
162 904 Uncollectible accounts 253,530   
163 905 Miscellaneous customer accounts expenses 53,054   
164 Total customer accounts expenses 1,484,117   
     
165 Customer Service and Informational Expenses  
166 Operation  
167 907 Supervision  
168 908 Customer assistance expenses 1,036,719   
169 909 Informational and instructional advertising expenses 141,152   
170 910 Miscellaneous customer service and informational expenses 117,112   
171 Total customer service and informational expenses 1,294,983   
172 7. Sales Expenses  
173 Operation  
174 911 Supervision  
175 912 Demonstrating and selling expenses  
176 913 Advertising expenses 130,928   
177 916 Miscellaneous sales expenses  
178 Total sales expenses 130,928   
179 8. Administrative and General Expenses  
180 Operation  
181 920 Administrative and general salaries 3,840,591   
182 921 Office supplies and expenses 2,328,951   
183 922 Less: Administrative expenses transferred - credits 1,288,571   
184 923 Outside services employed 990,106   
185 924 Property insurance 187,759   
186 925 Injuries and damages 2,126,644   
187 926 Employee pensions and benefits 3,264,364   
188 927 Franchise requirements  
189 928 Regulatory commission expenses (41,555)  
190 929 Less: Duplicate charges - credit  
191 930.1 General advertising expenses 106,462   
192 930.2 Miscellaneous general expenses 601,047   
193 931 Rents 148,689   
194 Total Operations 12,264,487   
195 Maintenance  
196 935 Maintenance of general plant 605,599   
197 Total administrative and general expenses 12,870,086   
198 Total Elec. Op. and Maint. Expns. 106,657,725   
(b) Concept: MiscellaneousGeneralExpenses

On January 1, 2024, NorthWestern Corporation contributed the assets and liabilities of its South Dakota and Nebraska regualted utilities to NorthWestern Energy Public Service Corporation. The 2023 amounts below are the results for the South Dakota operations for the year ended December 31, 2023, while under NorthWestern Corporation's ownership.

South Dakota Operations Only   2024   2023
Universal System Benefits Charge   -     -  
Our Portion of Shared Ownership Gen    -      -  
      -       -  
                           
Board of Directors Fees            237,414     286,502
Shareholder Expense              14,070       13,458
Industry & Association Dues            228,386     235,991
Amortization of upfront fees            124,806       60,089
Human Resources general expenses (non-labor and not provided for elsewhere)              14,142          5,777
Miscellaneous                    962           (770)
    619,780    601,047
         
Total Acount 930.2    619,780   601,047

Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
PURCHASED POWER (Account 555)
  1. Report all power purchases made during the year. Also report exchanges of electricity (i.e., transactions involving a balancing of debits and credits for energy, capacity, etc.) and any settlements for imbalanced exchanges.
  2. Enter the name of the seller or other party in an exchange transaction in column (a). Do not abbreviate or truncate the name or use acronyms. Explain in a footnote any ownership interest or affiliation the respondent has with the seller.
  3. In column (b), enter a Statistical Classification Code based on the original contractual terms and conditions of the service as follows:

    RQ - for requirements service. Requirements service is service which the supplier plans to provide on an ongoing basis (i.e., the supplier includes projects load for this service in its system resource planning). In addition, the reliability of requirement service must be the same as, or second only to, the supplier's service to its own ultimate consumers.

    LF - for long-term firm service. "Long-term" means five years or longer and "firm" means that service cannot be interrupted for economic reasons and is intended to remain reliable even under adverse conditions (e.g., the supplier must attempt to buy emergency energy from third parties to maintain deliveries of LF service). This category should not be used for long-term firm service firm service which meets the definition of RQ service. For all transaction identified as LF, provide in a footnote the termination date of the contract defined as the earliest date that either buyer or seller can unilaterally get out of the contract.

    IF - for intermediate-term firm service. The same as LF service expect that "intermediate-term" means longer than one year but less than five years.

    SF - for short-term service. Use this category for all firm services, where the duration of each period of commitment for service is one year or less.

    LU - for long-term service from a designated generating unit. "Long-term" means five years or longer. The availability and reliability of service, aside from transmission constraints, must match the availability and reliability of the designated unit.

    IU - for intermediate-term service from a designated generating unit. The same as LU service expect that "intermediate-term" means longer than one year but less than five years.

    EX - For exchanges of electricity. Use this category for transactions involving a balancing of debits and credits for energy, capacity, etc. and any settlements for imbalanced exchanges.

    OS - for other service. Use this category only for those services which cannot be placed in the above-defined categories, such as all non-firm service regardless of the Length of the contract and service from designated units of Less than one year. Describe the nature of the service in a footnote for each adjustment.

    AD - for out-of-period adjustment. Use this code for any accounting adjustments or "true-ups" for service provided in prior reporting years. Provide an explanation in a footnote for each adjustment.

  4. In column (c), identify the FERC Rate Schedule Number or Tariff, or, for non-FERC jurisdictional sellers, include an appropriate designation for the contract. On separate lines, list all FERC rate schedules, tariffs or contract designations under which service, as identified in column (b), is provided.
  5. For requirements RQ purchases and any type of service involving demand charges imposed on a monnthly (or longer) basis, enter the monthly average billing demand in column (d), the average monthly non-coincident peak (NCP) demand in column (e), and the average monthly coincident peak (CP) demand in column (f). For all other types of service, enter NA in columns (d), (e) and (f). Monthly NCP demand is the maximum metered hourly (60-minute integration) demand in a month. Monthly CP demand is the metered demand during the hour (60-minute integration) in which the supplier's system reaches its monthly peak. Demand reported in columns (e) and (f) must be in megawatts. Footnote any demand not stated on a megawatt basis and explain.
  6. Report in column (g) the megawatthours shown on bills rendered to the respondent, excluding purchases for energy storage. Report in column (h) the megawatthours shown on bills rendered to the respondent for energy storage purchases. Report in columns (i) and (j) the megawatthours of power exchanges received and delivered, used as the basis for settlement. Do not report net exchange.
  7. Report demand charges in column (k), energy charges in column (l), and the total of any other types of charges, including out-of-period adjustments, in column (m). Explain in a footnote all components of the amount shown in column (m). Report in column (n) the total charge shown on bills received as settlement by the respondent. For power exchanges, report in column (n) the settlement amount for the net receipt of energy. If more energy was delivered than received, enter a negative amount. If the settlement amount (m) include credits or charges other than incremental generation expenses, or (2) excludes certain credits or charges covered by the agreement, provide an explanatory footnote.
  8. The data in columns (g) through (n) must be totaled on the last line of the schedule. The total amount in columns (g) and (h) must be reported as Purchases on Page 401, line 10. The total amount in column (i) must be reported as Exchange Received on Page 401, line 12. The total amount in column (j) must be reported as Exchange Delivered on Page 401, line 13.
  9. Footnote entries as required and provide explanations following all required data.
Actual Demand (MW) POWER EXCHANGES COST/SETTLEMENT OF POWER
Line No.
NameOfCompanyOrPublicAuthorityProvidingPurchasedPower
Name of Company or Public Authority (Footnote Affiliations)
(a)
StatisticalClassificationCode
Statistical Classification
(b)
RateScheduleTariffNumber
Ferc Rate Schedule or Tariff Number
(c)
AverageMonthlyBillingDemand
Average Monthly Billing Demand (MW)
(d)
AverageMonthlyNonCoincidentPeakDemand
Average Monthly NCP Demand
(e)
AverageMonthlyCoincidentPeakDemand
Average Monthly CP Demand
(f)
MegawattHoursPurchasedOtherThanStorage
MegaWatt Hours Purchased (Excluding for Energy Storage)
(g)
MegawattHoursPurchasedForEnergyStorage
MegaWatt Hours Purchased for Energy Storage
(h)
EnergyReceivedThroughPowerExchanges
MegaWatt Hours Received
(i)
EnergyDeliveredThroughPowerExchanges
MegaWatt Hours Delivered
(j)
DemandChargesOfPurchasedPower
Demand Charges ($)
(k)
EnergyChargesOfPurchasedPower
Energy Charges ($)
(l)
OtherChargesOfPurchasedPower
Other Charges ($)
(m)
SettlementOfPower
Total (k+l+m) of Settlement ($)
(n)
1
WAPA (Various)
0
0
147,481
0
147,481
2
Lincoln Energy Services
0
1,120,000
0
0
1,120,000
3
Southwest Power Pool
285,236
0
4,032,441
0
4,032,441
4
Titan Wind (PPA Wind #1)
75,975
0
5,836,324
0
5,836,324
5
Oak Tree (PPA Wind #2)
71,454
0
3,659,716
0
3,659,716
6
Aurora Wind
83,613
0
2,232,572
0
2,232,572
7
Brule Wind
81,906
0
2,220,749
0
2,220,749
8
Codington Clark Electric
0
0
11,402
0
11,402
9
MidAmerican Energy
0
0
20,462
0
20,462
10
Terex
0
0
0
(a)
2,495
2,495
15 TOTAL
598,184
0
0
1,120,000
18,161,147
2,495
19,278,652


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: OtherChargesOfPurchasedPower

REC sales


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
TRANSMISSION OF ELECTRICITY FOR OTHERS (Account 456.1) (Including transactions referred to as "wheeling")
  1. Report all transmission of electricity, i.e., wheeling, provided for other electric utilities, cooperatives, other public authorities, qualifying facilities, non-traditional utility suppliers and ultimate customers for the quarter.
  2. Use a separate line of data for each distinct type of transmission service involving the entities listed in column (a), (b) and (c).
  3. Report in column (a) the company or public authority that paid for the transmission service. Report in column (b) the company or public authority that the energy was received from and in column (c) the company or public authority that the energy was delivered to. Provide the full name of each company or public authority. Do not abbreviate or truncate name or use acronyms. Explain in a footnote any ownership interest in or affiliation the respondent has with the entities listed in columns (a), (b) or (c).
  4. In column (d) enter a Statistical Classification code based on the original contractual terms and conditions of the service as follows: FNO - Firm Network Service for Others, FNS - Firm Network Transmission Service for Self, LFP - "Long-Term Firm Point to Point Transmission Service, OLF - Other Long-Term Firm Transmission Service, SFP - Short-Term Firm Point to Point Transmission Reservation, NF - non-firm transmission service, OS - Other Transmission Service and AD - Out-of-Period Adjustments. Use this code for any accounting adjustments or "true-ups" for service provided in prior reporting periods. Provide an explanation in a footnote for each adjustment. See General Instruction for definitions of codes.
  5. In column (e), identify the FERC Rate Schedule or Tariff Number, On separate lines, list all FERC rate schedules or contract designations under which service, as identified in column (d), is provided.
  6. Report receipt and delivery locations for all single contract path, "point to point" transmission service. In column (f), report the designation for the substation, or other appropriate identification for where energy was received as specified in the contract. In column (g) report the designation for the substation, or other appropriate identification for where energy was delivered as specified in the contract.
  7. Report in column (h) the number of megawatts of billing demand that is specified in the firm transmission service contract. Demand reported in column (h) must be in megawatts. Footnote any demand not stated on a megawatts basis and explain.
  8. Report in column (i) and (j) the total megawatthours received and delivered.
  9. In column (k) through (n), report the revenue amounts as shown on bills or vouchers. In column (k), provide revenues from demand charges related to the billing demand reported in column (h). In column (I), provide revenues from energy charges related to the amount of energy transferred. In column (m), provide the total revenues from all other charges on bills or vouchers rendered, including out of period adjustments. Explain in a footnote all components of the amount shown in column (m). Report in column (n) the total charge shown on bills rendered to the entity Listed in column (a). If no monetary settlement was made, enter zero (0) in column (n). Provide a footnote explaining the nature of the non-monetary settlement, including the amount and type of energy or service rendered.
  10. The total amounts in columns (i) and (j) must be reported as Transmission Received and Transmission Delivered for annual report purposes only on Page 401, Lines 16 and 17, respectively.
  11. Footnote entries and provide explanations following all required data.
TRANSFER OF ENERGY REVENUE FROM TRANSMISSION OF ELECTRICITY FOR OTHERS
Line No.
PaymentByCompanyOrPublicAuthority
Payment By (Company of Public Authority) (Footnote Affiliation)
(a)
TransmissionEnergyReceivedFromCompanyOrPublicAuthorityName
Energy Received From (Company of Public Authority) (Footnote Affiliation)
(b)
TransmissionEnergyDeliveredToCompanyOrPublicAuthorityName
Energy Delivered To (Company of Public Authority) (Footnote Affiliation)
(c)
StatisticalClassificationCode
Statistical Classification
(d)
RateScheduleTariffNumber
Ferc Rate Schedule of Tariff Number
(e)
TransmissionPointOfReceipt
Point of Receipt (Substation or Other Designation)
(f)
TransmissionPointOfDelivery
Point of Delivery (Substation or Other Designation)
(g)
BillingDemand
Billing Demand (MW)
(h)
TransmissionOfElectricityForOthersEnergyReceived
Megawatt Hours Received
(i)
TransmissionOfElectricityForOthersEnergyDelivered
Megawatt Hours Delivered
(j)
Demand Charges ($)
(k)
Energy Charges ($)
(l)
Other Charges ($)
(m)
RevenuesFromTransmissionOfElectricityForOthers
Total Revenues ($) (k+l+m)
(n)
1
BRYANT, CITY OF
WAPA
BRYANT
HURON 115 KV BUS
BRYANT 25 KV
4,158
4,158
29,457
0
0
29,457
2
GROTON, CITY OF
WAPA
GROTON
HURON 115 KV BUS
GROTON 69 KV
15,928
15,928
1,008
0
0
1,008
3
LANGFORD, CITY OF
WAPA
LANGFORD
HURON 115 KV BUS
LANGFORD 12.5 KV
3,145
3,145
22,601
0
0
22,601
4
EAST RIVER ELECTRIC POWER COOP
WAPA
WEBSTER
WEBSTER
0
0
0
0
0
0
5
Southwest Power Pool (SPP)
SPP
Various
Various
Various
0
0
0
0
(a)
221,705
221,705
6
Southwest Power Pool (SPP)
SPP
Various
Various
Various
0
0
0
0
(b)
61,523
61,523
7
Southwest Power Pool (SPP)
SPP
Various
Various
Various
0
0
0
0
(c)
6,564,632
6,564,632
8
Southwest Power Pool (SPP)
SPP
Various
Various
Various
0
0
0
0
(d)
83,443
83,443
9
Southwest Power Pool (SPP)
SPP
Various
Various
Various
0
0
0
0
(e)
6,854
6,854
35 TOTAL
23,231
23,231
53,066
0
6,938,157
6,991,223


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: OtherChargesRevenueTransmissionOfElectricityForOthers

Firm and Non-Firm Point to Point Transmission Sales

(b) Concept: OtherChargesRevenueTransmissionOfElectricityForOthers

Non-Firm Point to Point Transmission Sales

(c) Concept: OtherChargesRevenueTransmissionOfElectricityForOthers

Network Integration Transmission Services

(d) Concept: OtherChargesRevenueTransmissionOfElectricityForOthers

Firm and Non-Firm Point to Point Transmission Sales

(e) Concept: OtherChargesRevenueTransmissionOfElectricityForOthers

Firm and Non-Firm Point to Point Transmission Sales


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
TRANSMISSION OF ELECTRICITY BY ISO/RTOs
  1. Report in Column (a) the Transmission Owner receiving revenue for the transmission of electricity by the ISO/RTO.
  2. Use a separate line of data for each distinct type of transmission service involving the entities listed in Column (a).
  3. In Column (b) enter a Statistical Classification code based on the original contractual terms and conditions of the service as follows: FNO – Firm Network Service for Others, FNS – Firm Network Transmission Service for Self, LFP – Long-Term Firm Point-to-Point Transmission Service, OLF – Other Long-Term Firm Transmission Service, SFP – Short-Term Firm Point-to-Point Transmission Reservation, NF – Non-Firm Transmission Service, OS – Other Transmission Service and AD- Out-of-Period Adjustments. Use this code for any accounting adjustments or “true-ups” for service provided in prior reporting periods. Provide an explanation in a footnote for each adjustment. See General Instruction for definitions of codes.
  4. In column (c) identify the FERC Rate Schedule or tariff Number, on separate lines, list all FERC rate schedules or contract designations under which service, as identified in column (b) was provided.
  5. In column (d) report the revenue amounts as shown on bills or vouchers.
  6. Report in column (e) the total revenues distributed to the entity listed in column (a).
Line No.
Payment Received by (Transmission Owner Name)
(a)
Statistical Classification
(b)
FERC Rate Schedule or Tariff Number
(c)
Total Revenue by Rate Schedule or Tariff
(d)
Total Revenue
(e)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
40
TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
TRANSMISSION OF ELECTRICITY BY OTHERS (Account 565)
  1. Report all transmission, i.e. wheeling or electricity provided by other electric utilities, cooperatives, municipalities, other public authorities, qualifying facilities, and others for the quarter.
  2. In column (a) report each company or public authority that provided transmission service. Provide the full name of the company, abbreviate if necessary, but do not truncate name or use acronyms. Explain in a footnote any ownership interest in or affiliation with the transmission service provider. Use additional columns as necessary to report all companies or public authorities that provided transmission service for the quarter reported.
  3. In column (b) enter a Statistical Classification code based on the original contractual terms and conditions of the service as follows:
    FNS - Firm Network Transmission Service for Self, LFP - Long-Term Firm Point-to-Point Transmission Reservations. OLF - Other Long-Term Firm Transmission Service, SFP - Short-Term Firm Point-to- Point Transmission Reservations, NF - Non-Firm Transmission Service, and OS - Other Transmission Service. See General Instructions for definitions of statistical classifications.
  4. Report in column (c) and (d) the total megawatt hours received and delivered by the provider of the transmission service.
  5. Report in column (e), (f) and (g) expenses as shown on bills or vouchers rendered to the respondent. In column (e) report the demand charges and in column (f) energy charges related to the amount of energy transferred. On column (g) report the total of all other charges on bills or vouchers rendered to the respondent, including any out of period adjustments. Explain in a footnote all components of the amount shown in column (g). Report in column (h) the total charge shown on bills rendered to the respondent. If no monetary settlement was made, enter zero in column (h). Provide a footnote explaining the nature of the non-monetary settlement, including the amount and type of energy or service rendered.
  6. Enter ""TOTAL"" in column (a) as the last line.
  7. Footnote entries and provide explanations following all required data.
TRANSFER OF ENERGY EXPENSES FOR TRANSMISSION OF ELECTRICITY BY OTHERS
Line No.
NameOfCompanyOrPublicAuthorityTransmissionOfElectricityByOthers
Name of Company or Public Authority (Footnote Affiliations)
(a)
StatisticalClassificationCode
Statistical Classification
(b)
TransmissionOfElectricityByOthersEnergyReceived
MegaWatt Hours Received
(c)
TransmissionOfElectricityByOthersEnergyDelivered
MegaWatt Hours Delivered
(d)
DemandChargesTransmissionOfElectricityByOthers
Demand Charges ($)
(e)
EnergyChargesTransmissionOfElectricityByOthers
Energy Charges ($)
(f)
OtherChargesTransmissionOfElectricityByOthers
Other Charges ($)
(g)
ChargesForTransmissionOfElectricityByOthers
Total Cost of Transmission ($)
(h)
1
East River
0
0
267
0
0
267
2
West Central Elect COOP
0
0
4,428
0
0
4,428
3
OtterTail Power (for MISO)
0
0
0
0
0
0
4
Southwest Power Pool
0
0
18,869,980
0
0
18,869,980
TOTAL
18,874,675
0
0
18,874,675


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
MISCELLANEOUS GENERAL EXPENSES (Account 930.2) (ELECTRIC)
Line No.
Description
(a)
Amount
(b)
1
IndustryAssociationDues
Industry Association Dues
228,386
2
NuclearPowerResearchExpenses
Nuclear Power Research Expenses
3
OtherExperimentalAndGeneralResearchExpenses
Other Experimental and General Research Expenses
4
PublicationAndDistributionExpensesForSecuritiesToStockholders
Pub and Dist Info to Stkhldrs...expn servicing outstanding Securities
14,070
5
OtherMiscellaneousGeneralExpenses
Oth Expn greater than or equal to 5,000 show purpose, recipient, amount. Group if less than $5,000
6
Board of Directors Fees
237,414
7
Amortization of Upfront Fees
124,806
8
Human Resources General Expenses (non-labor and not provided for elsewhere)
14,142
9
Miscellaneous
962
46
MiscellaneousGeneralExpenses
TOTAL
(a)
619,780


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: MiscellaneousGeneralExpenses

On January 1, 2024, NorthWestern Corporation contributed the assets and liabilities of its South Dakota and Nebraska regualted utilities to NorthWestern Energy Public Service Corporation. The 2023 amounts below are the results for the South Dakota operations for the year ended December 31, 2023, while under NorthWestern Corporation's ownership.

South Dakota Operations Only   2024   2023
Universal System Benefits Charge   -     -  
Our Portion of Shared Ownership Gen    -      -  
      -       -  
                           
Board of Directors Fees            237,414     286,502
Shareholder Expense              14,070       13,458
Industry & Association Dues            228,386     235,991
Amortization of upfront fees            124,806       60,089
Human Resources general expenses (non-labor and not provided for elsewhere)              14,142          5,777
Miscellaneous                    962           (770)
    619,780    601,047
         
Total Acount 930.2    619,780   601,047

Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
Depreciation and Amortization of Electric Plant (Account 403, 404, 405)
  1. Report in section A for the year the amounts for: (b) Depreciation Expense (Account 403); (c) Depreciation Expense for Asset Retirement Costs (Account 403.1); (d) Amortization of Limited-Term Electric Plant (Account 404); and (e) Amortization of Other Electric Plant (Account 405).
  2. Report in Section B the rates used to compute amortization charges for electric plant (Accounts 404 and 405). State the basis used to compute charges and whether any changes have been made in the basis or rates used from the preceding report year.
  3. Report all available information called for in Section C every fifth year beginning with report year 1971, reporting annually only changes to columns (c) through (g) from the complete report of the preceding year.
    Unless composite depreciation accounting for total depreciable plant is followed, list numerically in column (a) each plant subaccount, account or functional classification, as appropriate, to which a rate is applied. Identify at the bottom of Section C the type of plant included in any sub-account used.
    In column (b) report all depreciable plant balances to which rates are applied showing subtotals by functional Classifications and showing composite total. Indicate at the bottom of section C the manner in which column balances are obtained. If average balances, state the method of averaging used.
    For columns (c), (d), and (e) report available information for each plant subaccount, account or functional classification listed in column (a). If plant mortality studies are prepared to assist in estimating average service Lives, show in column (f) the type of mortality curve selected as most appropriate for the account and in column (g), if available, the weighted average remaining life of surviving plant. If composite depreciation accounting is used, report available information called for in columns (b) through (g) on this basis.
  4. If provisions for depreciation were made during the year in addition to depreciation provided by application of reported rates, state at the bottom of section C the amounts and nature of the provisions and the plant items to which related.
A. Summary of Depreciation and Amortization Charges
Line No.
FunctionalClassificationAxis
Functional Classification
(a)
DepreciationExpenseExcludingAmortizationOfAcquisitionAdjustments
Depreciation Expense (Account 403)
(b)
DepreciationExpenseForAssetRetirementCostsExcludingAmortizationgOfAcquisitionAdjustments
Depreciation Expense for Asset Retirement Costs (Account 403.1)
(c)
AmortizationOfLimitedTermPlantOrProperty
Amortization of Limited Term Electric Plant (Account 404)
(d)
AmortizationOfOtherElectricPlant
Amortization of Other Electric Plant (Acc 405)
(e)
DepreciationAndAmortization
Total
(f)
1
Intangible Plant
209,391
209,391
2
Steam Production Plant
8,556,340
8,556,340
3
Nuclear Production Plant
0
0
4
Hydraulic Production Plant-Conventional
0
0
5
Hydraulic Production Plant-Pumped Storage
0
0
6
Other Production Plant
8,776,155
8,776,155
7
Transmission Plant
5,929,291
5,929,291
8
Distribution Plant
12,015,205
12,015,205
9
Regional Transmission and Market Operation
0
10
General Plant
1,389,930
1,389,930
11
Common Plant-Electric
3,543,420
988,507
4,531,927
12
TOTAL
40,210,341
1,197,898
41,408,239
B. Basis for Amortization Charges
For our South Dakota operations, the rates used to compute amortization charges for 'Intangible Plant - Electric' (Account 404) are as follows: 303 Intangible Plant: Five Year Software 17.24%; 303 Intangible Plant: 10 Year Software 8.66%. Common amortization expense is allocated 85% to electric and 15% to gas based on allocation studies.
C. Factors Used in Estimating Depreciation Charges
Line No.
AccountNumberFactorsUsedInEstimatingDepreciationCharges
Account No.
(a)
DepreciablePlantBase
Depreciable Plant Base (in Thousands)
(b)
UtilityPlantEstimatedAverageServiceLife
Estimated Avg. Service Life
(c)
UtilityPlantNetSalvageValuePercentage
Net Salvage (Percent)
(d)
UtilityPlantAppliedDepreciationRate
Applied Depr. Rates (Percent)
(e)
MortalityCurveType
Mortality Curve Type
(f)
UtilityPlantWeightedAverageRemainingLife
Average Remaining Life
(g)
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
REGULATORY COMMISSION EXPENSES
  1. Report particulars (details) of regulatory commission expenses incurred during the current year (or incurred in previous years, if being amortized) relating to format cases before a regulatory body, or cases in which such a body was a party.
  2. Report in columns (b) and (c), only the current year's expenses that are not deferred and the current year's amortization of amounts deferred in previous years.
  3. Show in column (k) any expenses incurred in prior years which are being amortized. List in column (a) the period of amortization.
  4. List in columns (f), (g), and (h), expenses incurred during the year which were charged currently to income, plant, or other accounts.
  5. Minor items (less than $25,000) may be grouped.
EXPENSES INCURRED DURING YEAR AMORTIZED DURING YEAR
CURRENTLY CHARGED TO
Line No.
RegulatoryCommissionDescription
Description (Furnish name of regulatory commission or body the docket or case number and a description of the case)
(a)
RegulatoryExpensesAssessedByRegulatoryCommission
Assessed by Regulatory Commission
(b)
RegulatoryExpensesOfUtility
Expenses of Utility
(c)
RegulatoryCommissionExpensesAmount
Total Expenses for Current Year (b) + (c)
(d)
OtherRegulatoryAssetsRegulatoryCommissionExpenses
Deferred in Account 182.3 at Beginning of Year
(e)
NameOfDepartmentRegulatoryCommissionExpensesCharged
Department
(f)
AccountNumberRegulatoryCommissionExpensesCharged
Account No.
(g)
RegulatoryComissionExpensesIncurredAndCharged
Amount
(h)
RegulatoryCommissionExpensesDeferredToOtherRegulatoryAssets
Deferred to Account 182.3
(i)
DeferredRegulatoryCommissionExpensesAmortizedInContraAccount
Contra Account
(j)
DeferredRegulatoryCommissionExpensesAmortized
Amount
(k)
OtherRegulatoryAssetsRegulatoryCommissionExpenses
Deferred in Account 182.3 End of Year
(l)
1
FERC Order No. 472
2,576
2,576
0
Electric
2,576
2
South Dakota PUC Electric Rate Filings
0
78,562
78,562
43,774
Electric
78,562
0
14,591
29,183
3
South Dakota PUC Natural Gas Rate Filings
0
0
Natural Gas
0
59,239
59,239
4
Nebraska PSC Natural Gas Rate FIlings
0
0
Natural Gas
0
17,698
17,698
46
TOTAL
2,576
78,562
81,138
43,774
81,138
76,937
14,591
106,120


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
RESEARCH, DEVELOPMENT, AND DEMONSTRATION ACTIVITIES
  1. Describe and show below costs incurred and accounts charged during the year for technological research, development, and demonstration (R, D and D) project initiated, continued or concluded during the year. Report also support given to others during the year for jointly-sponsored projects.(Identify recipient regardless of affiliation.) For any R, D and D work carried with others, show separately the respondent's cost for the year and cost chargeable to others (See definition of research, development, and demonstration in Uniform System of Accounts).
  2. Indicate in column (a) the applicable classification, as shown below:
    Classifications:
    1. Electric R, D and D Performed Internally:
      1. Generation
        1. hydroelectric
          1. Recreation fish and wildlife
          2. Other hydroelectric
        2. Fossil-fuel steam
        3. Internal combustion or gas turbine
        4. Nuclear
        5. Unconventional generation
        6. Siting and heat rejection
      2. Transmission
        1. Overhead
        2. Underground
      3. Distribution
      4. Regional Transmission and Market Operation
      5. Environment (other than equipment)
      6. Other (Classify and include items in excess of $50,000.)
      7. Total Cost Incurred
    2. Electric, R, D and D Performed Externally:
      1. Research Support to the electrical Research Council or the Electric Power Research Institute
      2. Research Support to Edison Electric Institute
      3. Research Support to Nuclear Power Groups
      4. Research Support to Others (Classify)
      5. Total Cost Incurred
  3. Include in column (c) all R, D and D items performed internally and in column (d) those items performed outside the company costing $50,000 or more, briefly describing the specific area of R, D and D (such as safety, corrosion control, pollution, automation, measurement, insulation, type of appliance, etc.). Group items under $50,000 by classifications and indicate the number of items grouped. Under Other, (A (6) and B (4)) classify items by type of R, D and D activity.
  4. Show in column (e) the account number charged with expenses during the year or the account to which amounts were capitalized during the year, listing Account 107, Construction Work in Progress, first. Show in column (f) the amounts related to the account charged in column (e).
  5. Show in column (g) the total unamortized accumulating of costs of projects. This total must equal the balance in Account 188, Research, Development, and Demonstration Expenditures, Outstanding at the end of the year.
  6. If costs have not been segregated for R, D and D activities or projects, submit estimates for columns (c), (d), and (f) with such amounts identified by ""Est.""
  7. Report separately research and related testing facilities operated by the respondent.
AMOUNTS CHARGED IN CURRENT YEAR
Line No.
ResearchDevelopmentAndDemonstrationClassification
Classification
(a)
ResearchDevelopmentAndDemonstrationDescription
Description
(b)
ResearchDevelopmentAndDemonstrationCostsIncurredInternally
Costs Incurred Internally Current Year
(c)
ResearchDevelopmentAndDemonstrationCostsIncurredExternally
Costs Incurred Externally Current Year
(d)
AccountNumberForResearchDevelopmentAndDemonstrationCosts
Amounts Charged In Current Year: Account
(e)
ResearchDevelopmentAndDemonstrationCosts
Amounts Charged In Current Year: Amount
(f)
ResearchDevelopmentAndDemonstrationExpenditures
Unamortized Accumulation
(g)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
DISTRIBUTION OF SALARIES AND WAGES

Report below the distribution of total salaries and wages for the year. Segregate amounts originally charged to clearing accounts to Utility Departments, Construction, Plant Removals, and Other Accounts, and enter such amounts in the appropriate lines and columns provided. In determining this segregation of salaries and wages originally charged to clearing accounts, a method of approximation giving substantially correct results may be used.

Line No.
Classification
(a)
Direct Payroll Distribution
(b)
Allocation of Payroll Charged for Clearing Accounts
(c)
Total
(d)
1
SalariesAndWagesElectricAbstract
Electric
2
SalariesAndWagesElectricOperationAbstract
Operation
3
SalariesAndWagesElectricOperationProduction
Production
741,194
4
SalariesAndWagesElectricOperationTransmission
Transmission
537,342
5
SalariesAndWagesElectricOperationRegionalMarket
Regional Market
0
6
SalariesAndWagesElectricOperationDistribution
Distribution
2,073,596
7
SalariesAndWagesElectricOperationCustomerAccounts
Customer Accounts
604,453
8
SalariesAndWagesElectricOperationCustomerServiceAndInformational
Customer Service and Informational
1,003,218
9
SalariesAndWagesElectricOperationSales
Sales
0
10
SalariesAndWagesElectricOperationAdministrativeAndGeneral
Administrative and General
4,416,457
11
SalariesAndWagesElectricOperation
TOTAL Operation (Enter Total of lines 3 thru 10)
9,376,260
12
SalariesAndWagesElectricMaintenanceAbstract
Maintenance
13
SalariesAndWagesElectricMaintenanceProduction
Production
280,963
14
SalariesAndWagesElectricMaintenanceTransmission
Transmission
211,422
15
SalariesAndWagesElectricMaintenanceRegionalMarket
Regional Market
0
16
SalariesAndWagesElectricMaintenanceDistribution
Distribution
1,668,757
17
SalariesAndWagesElectricMaintenanceAdministrativeAndGeneral
Administrative and General
209,286
18
SalariesAndWagesElectricMaintenance
TOTAL Maintenance (Total of lines 13 thru 17)
2,370,428
19
SalariesAndWagesElectricOperationAndMaintenanceAbstract
Total Operation and Maintenance
20
SalariesAndWagesElectricProduction
Production (Enter Total of lines 3 and 13)
1,022,157
21
SalariesAndWagesElectricTransmission
Transmission (Enter Total of lines 4 and 14)
748,764
22
SalariesAndWagesElectricRegionalMarket
Regional Market (Enter Total of Lines 5 and 15)
0
23
SalariesAndWagesElectricDistribution
Distribution (Enter Total of lines 6 and 16)
3,742,353
24
SalariesAndWagesElectricCustomerAccounts
Customer Accounts (Transcribe from line 7)
604,453
25
SalariesAndWagesElectricCustomerServiceAndInformational
Customer Service and Informational (Transcribe from line 8)
1,003,218
26
SalariesAndWagesElectricSales
Sales (Transcribe from line 9)
0
27
SalariesAndWagesElectricAdministrativeAndGeneral
Administrative and General (Enter Total of lines 10 and 17)
4,625,743
28
SalariesAndWagesElectricOperationAndMaintenance
TOTAL Oper. and Maint. (Total of lines 20 thru 27)
11,746,688
11,746,688
29
SalariesAndWagesGasAbstract
Gas
30
SalariesAndWagesGasOperationAbstract
Operation
31
SalariesAndWagesGasOperationProductionManufacturedGas
Production - Manufactured Gas
0
32
SalariesAndWagesGasOperationProductionNaturalGas
Production-Nat. Gas (Including Expl. And Dev.)
0
33
SalariesAndWagesGasOperationOtherGasSupply
Other Gas Supply
0
34
SalariesAndWagesGasOperationStorageLiquifiedNaturalGasTerminalingAndProcessing
Storage, LNG Terminaling and Processing
0
35
SalariesAndWagesGasOperationTransmission
Transmission
41,304
36
SalariesAndWagesGasOperationDistribution
Distribution
3,691,943
37
SalariesAndWagesGasCustomerAccounts
Customer Accounts
577,910
38
SalariesAndWagesGasCustomerServiceAndInformational
Customer Service and Informational
623,874
39
SalariesAndWagesGasSales
Sales
0
40
SalariesAndWagesGasOperationAdministrativeAndGeneral
Administrative and General
3,396,759
41
SalariesAndWagesGasOperation
TOTAL Operation (Enter Total of lines 31 thru 40)
8,331,790
42
SalariesAndWagesGasMaintenanceAbstract
Maintenance
43
SalariesAndWagesGasMaintenanceProductionManufacturedGas
Production - Manufactured Gas
0
44
SalariesAndWagesGasMaintenanceProductionNaturalGas
Production-Natural Gas (Including Exploration and Development)
0
45
SalariesAndWagesGasMaintenanceOtherGasSupply
Other Gas Supply
0
46
SalariesAndWagesGasMaintenanceStorageLngTerminalingAndProcessing
Storage, LNG Terminaling and Processing
0
47
SalariesAndWagesGasMaintenanceTransmission
Transmission
7,360
48
SalariesAndWagesGasMaintenanceDistribution
Distribution
1,060,078
49
SalariesAndWagesGasMaintenanceAdministrativeAndGeneral
Administrative and General
123,318
50
SalariesAndWagesGasMaintenance
TOTAL Maint. (Enter Total of lines 43 thru 49)
1,190,756
51
SalariesAndWagesGasOperationAndMaintenanceAbstract
Total Operation and Maintenance
52
SalariesAndWagesGasProductionManufacturedGas
Production-Manufactured Gas (Enter Total of lines 31 and 43)
0
53
SalariesAndWagesGasProductionNaturalGas
Production-Natural Gas (Including Expl. and Dev.) (Total lines 32,
0
54
SalariesAndWagesGasOtherGasSupply
Other Gas Supply (Enter Total of lines 33 and 45)
0
55
SalariesAndWagesGasStorageLngTerminalingAndProcessing
Storage, LNG Terminaling and Processing (Total of lines 31 thru
0
56
SalariesAndWagesGasTransmission
Transmission (Lines 35 and 47)
48,664
57
SalariesAndWagesGasDistribution
Distribution (Lines 36 and 48)
4,752,021
58
SalariesAndWagesGasCustomerAccounts
Customer Accounts (Line 37)
577,910
59
SalariesAndWagesGasCustomerServiceAndInformational
Customer Service and Informational (Line 38)
623,874
60
SalariesAndWagesGasSales
Sales (Line 39)
0
61
SalariesAndWagesGasAdministrativeAndGeneral
Administrative and General (Lines 40 and 49)
3,520,077
62
SalariesAndWagesGasOperationAndMaintenance
TOTAL Operation and Maint. (Total of lines 52 thru 61)
9,522,546
9,522,546
63
SalariesAndWagesOtherUtilityDepartmentsAbstract
Other Utility Departments
64
SalariesAndWagesOtherUtilityDepartmentsOperationAndMaintenance
Operation and Maintenance
65
SalariesAndWagesOperationsAndMaintenance
TOTAL All Utility Dept. (Total of lines 28, 62, and 64)
21,269,234
21,269,234
66
SalariesAndWagesUtilityPlantAbstract
Utility Plant
67
SalariesAndWagesUtilityPlantConstructionAbstract
Construction (By Utility Departments)
68
SalariesAndWagesUtilityPlantConstructionElectricPlant
Electric Plant
5,512,066
5,512,066
69
SalariesAndWagesUtilityPlantConstructionGasPlant
Gas Plant
2,426,518
2,426,518
70
SalariesAndWagesUtilityPlantConstructionOther
Other (provide details in footnote):
394,608
394,608
71
SalariesAndWagesUtilityPlantConstruction
TOTAL Construction (Total of lines 68 thru 70)
8,333,192
8,333,192
72
SalariesAndWagesPlantRemovalAbstract
Plant Removal (By Utility Departments)
73
SalariesAndWagesPlantRemovalElectricPlant
Electric Plant
74
SalariesAndWagesPlantRemovalGasPlant
Gas Plant
75
SalariesAndWagesPlantRemovalOther
Other (provide details in footnote):
76
SalariesAndWagesPlantRemoval
TOTAL Plant Removal (Total of lines 73 thru 75)
77
SalariesAndWagesOtherAccountsAbstract
Other Accounts (Specify, provide details in footnote):
78
SalariesAndWagesOtherAccountsDescription
A/R ASSOCIATED COMPANIES (ACCT 146)
10,115,494
10,115,494
79
SalariesAndWagesOtherAccountsDescription
EXPENSES OF NON-UTILITY OP (ACCT 417)
47,826
47,826
80
SalariesAndWagesOtherAccountsDescription
81
SalariesAndWagesOtherAccountsDescription
82
SalariesAndWagesOtherAccountsDescription
83
SalariesAndWagesOtherAccountsDescription
84
SalariesAndWagesOtherAccountsDescription
85
SalariesAndWagesOtherAccountsDescription
86
SalariesAndWagesOtherAccountsDescription
87
SalariesAndWagesOtherAccountsDescription
88
SalariesAndWagesOtherAccountsDescription
89
SalariesAndWagesOtherAccountsDescription
90
SalariesAndWagesOtherAccountsDescription
91
SalariesAndWagesOtherAccountsDescription
92
SalariesAndWagesOtherAccountsDescription
93
SalariesAndWagesOtherAccountsDescription
94
SalariesAndWagesOtherAccountsDescription
95
SalariesAndWagesOtherAccounts
TOTAL Other Accounts
10,163,320
10,163,320
96
SalariesAndWagesGeneralExpense
TOTAL SALARIES AND WAGES
39,765,746
39,765,746


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
COMMON UTILITY PLANT AND EXPENSES
  1. Describe the property carried in the utility's accounts as common utility plant and show the book cost of such plant at end of year classified by accounts as provided by Electric Plant Instruction 13, Common Utility Plant, of the Uniform System of Accounts. Also show the allocation of such plant costs to the respective departments using the common utility plant and explain the basis of allocation used, giving the allocation factors.
  2. Furnish the accumulated provisions for depreciation and amortization at end of year, showing the amounts and classifications of such accumulated provisions, and amounts allocated to utility departments using the common utility plant to which such accumulated provisions relate, including explanation of basis of allocation and factors used.
  3. Give for the year the expenses of operation, maintenance, rents, depreciation, and amortization for common utility plant classified by accounts as provided by the Uniform System of Accounts. Show the allocation of such expenses to the departments using the common utility plant to which such expenses are related. Explain the basis of allocation used and give the factors of allocation.
  4. Give date of approval by the Commission for use of the common utility plant classification and reference to the order of the Commission or other authorization.

 

 

 

 

 

Item   #  1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Common Utility Plant at December 31, 2024

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLANT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ACCOUNT

 

    Description 

 

Total

 

Electric

 

Natural Gas

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

303

 

Misc. Intangible Plant

 

9,929,260.00

 

8,439,871.00

 

1,489,389.00

 

 

 

 

 

 

389

 

Land & Land Rights

 

1,216,340.00

 

1,033,889.00

 

182,451.00

 

 

 

 

 

 

390

 

Structures & Improvements

 

41,610,929.00

 

35,369,290.00

 

6,241,639.00

 

 

 

 

 

 

391

 

Office Furniture & Equipment

 

7,318,165.00

 

6,220,440.00

 

1,097,725.00

 

 

 

 

 

 

392

 

Transportation Equipment

 

4,085,567.00

 

3,472,732.00

 

612,835.00

 

 

 

 

 

 

393

 

Stores Equipment

 

108,545.00

 

92,263.00

 

16,282.00

 

 

 

 

 

 

394

 

Tools/Shop/Garage Equipment

 

188,643.00

 

160,347.00

 

28,296.00

 

 

 

 

 

 

395

 

Laboratory Equipment

 

0.00

 

0.00

 

0.00

 

 

 

 

 

 

396

 

Power Operated Equipment

 

2,807,655.00

 

2,386,507.00

 

421,148.00

 

 

 

 

 

 

397

 

Communication Equipment

 

4,140,993.00

 

3,519,844.00

 

621,149.00

 

 

 

 

 

 

398

 

Miscellaneous

 

27,829.00

 

23,654.00

 

4,175.00

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sub -Total

 

 

 

71,433,926.00

 

60,718,837.00

 

10,715,089.00

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Construction Work In Progress

 

1,988,702.20

 

1,690,396.87

 

298,305.33

 

CWIP breakout

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total 

 

73,422,628.20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Common utility plant is allocated to utility departments based on estimated individual facility utilization.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Item   #  2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Common Utility Accumulated Depreciation Reserve At December 31, 2024

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLANT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ACCOUNT

 

    Description 

 

Total

 

Electric

 

Natural Gas

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

303

 

Misc. Intangible Plant

 

      4,692,586.00

 

      3,988,698.00

 

         703,888.00

 

 

 

 

 

 

389

 

Land & Land Rights

 

                      -  

 

                      -  

 

                      -  

 

 

 

 

 

 

390

 

Structures & Improvements

 

    10,138,609.00

 

      8,617,818.00

 

      1,520,791.00

 

 

 

 

 

 

391

 

Office Furniture & Equipment

 

      2,500,118.00

 

      2,125,100.00

 

         375,018.00

 

 

 

 

 

 

392

 

Transportation Equipment

 

      1,926,869.00

 

      1,637,839.00

 

         289,030.00

 

 

 

 

 

 

393

 

Stores Equipment

 

           13,549.00

 

           11,517.00

 

            2,032.00

 

 

 

 

 

 

394

 

Tools/Shop/Garage Equipment

 

           83,569.00

 

           71,034.00

 

           12,535.00

 

 

 

 

 

 

395

 

Laboratory Equipment

 

                      -  

 

                      -  

 

                      -  

 

 

 

 

 

 

396

 

Power Operated Equipment

 

      1,178,645.00

 

      1,001,848.00

 

         176,797.00

 

 

 

 

 

 

397

 

Communication Equipment

 

      3,272,090.00

 

      2,781,277.00

 

         490,814.00

 

 

 

 

 

 

398

 

Miscellaneous

 

           (55,768)

 

            (47,403)

 

            (8,365)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total

 

 

 

23,750,269

 

20,187,728

 

3,562,541

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 Common Utility Plant Expenses December 31, 2024

 

 

 

 

 

 

 

 

 

 

 

 

ITEM #3

 

 

 

Real Estate 

 

Depreciation

 

 

 

 

 

 

 

 

 

 

General 

 

& Personal 

 

&

 

 

 

 

 

 

 

 

Common Expenses

Building

 

Property Tax

 

Amortization

 

Total

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Electric:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Depreciation

 

 

 

 

3,543,420.00

 

3,543,420.00

 

 

 

 

 

 

Amortization

 

 

 

 

988,507.00

 

988,507.00

 

 

 

 

 

 

Taxes Other than Income

 

 

347,676

 

 

 

347,676

 

 

 

 

 

 

Administrative & General

778,172

 

 

 

 

 

778,172

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Subtotal

 

778,172

 

347,676

 

4,531,926.00

 

5,657,774

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Natural Gas:

 

 

 

 

 

 

 

 

 

 

 

 

Depreciation

 

 

 

 

637,516.00

 

637,516.00

 

 

 

 

 

 

Amortization

 

 

 

 

177,822.00

 

177,822.00

 

 

 

 

 

 

Taxes Other than Income

 

61,355

 

 

 

61,355

 

 

 

 

 

 

Administrative & General

563,504

 

 

 

 

 

563,504

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Subtotal

 

563,504

 

61,355

 

815,338.00

 

1,440,197

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total Common Expense

1,341,676

 

409,031

 

5,347,265.00

 

7,097,972

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1)

 

General building expense is allocated to departmental expense accounts based on estimated facility utilization

 

 

 

 

 

(2)

 

Real Estate & Personal Property Taxes are allocated to departmental expense accounts based on the estimated facility utilization

 

 

 

 

(3)

 

 

Depreciation & Amortization expense is allocated to utility deparmental expense accounts based on the estimated individual facility utilization applicable to the depreciable common plan

Item # 4

 

 

 

 

FERC staff reccomendation dated January 19, 1967 gave approval for the use of the common classificaiotn. 

 

 

 


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
AMOUNTS INCLUDED IN ISO/RTO SETTLEMENT STATEMENTS
  1. The respondent shall report below the details called for concerning amounts it recorded in Account 555, Purchase Power, and Account 447, Sales for Resale, for items shown on ISO/RTO Settlement Statements. Transactions should be separately netted for each ISO/RTO administered energy market for purposes of determining whether an entity is a net seller or purchaser in a given hour. Net megawatt hours are to be used as the basis for determining whether a net purchase or sale has occurred. In each monthly reporting period, the hourly sale and purchase net amounts are to be aggregated and separately reported in Account 447, Sales for Resale, or Account 555, Purchased Power, respectively.
Line No.
Description of Item(s)
(a)
Balance at End of Quarter 1
(b)
Balance at End of Quarter 2
(c)
Balance at End of Quarter 3
(d)
Balance at End of Year
(e)
1 Energy
2 Net Purchases (Account 555)
32,473,799
14,138,828
30,253,566
26,526,792
2.1 Net Purchases (Account 555.1)
3 Net Sales (Account 447)
31,913,684
14,264,167
29,508,510
23,674,183
4 Transmission Rights
5 Ancillary Services
25,250
25,250
24,765
26,250
6 Other Items (list separately)
7
Day Ahead & Real Time Admin
88,373
88,373
86,680
91,873
8
Market Monitoring & Compliance
12,625
12,625
12,383
13,125
46 TOTAL
686,363
909
868,885
2,983,857


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
PURCHASES AND SALES OF ANCILLARY SERVICES
Report the amounts for each type of ancillary service shown in column (a) for the year as specified in Order No. 888 and defined in the respondents Open Access Transmission Tariff.
In columns for usage, report usage-related billing determinant and the unit of measure.
  1. On Line 1 columns (b), (c), (d), and (e) report the amount of ancillary services purchased and sold during the year.
  2. On Line 2 columns (b), (c), (d), and (e) report the amount of reactive supply and voltage control services purchased and sold during the year.
  3. On Line 3 columns (b), (c), (d), and (e) report the amount of regulation and frequency response services purchased and sold during the year.
  4. On Line 4 columns (b), (c), (d), and (e) report the amount of energy imbalance services purchased and sold during the year.
  5. On Lines 5 and 6, columns (b), (c), (d), and (e) report the amount of operating reserve spinning and supplement services purchased and sold during the period.
  6. On Line 7 columns (b), (c), (d), and (e) report the total amount of all other types ancillary services purchased or sold during the year. Include in a footnote and specify the amount for each type of other ancillary service provided.
Amount Purchased for the Year Amount Sold for the Year
Usage - Related Billing Determinant Usage - Related Billing Determinant
Line No.
Type of Ancillary Service
(a)
Number of Units
(b)
Unit of Measure
(c)
Dollar
(d)
Number of Units
(e)
Unit of Measure
(f)
Dollars
(g)
1
Scheduling, System Control and Dispatch
2
Reactive Supply and Voltage
3
Regulation and Frequency Response
4
Energy Imbalance
5
Operating Reserve - Spinning
6
Operating Reserve - Supplement
7
Other
8
Total (Lines 1 thru 7)


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
MONTHLY TRANSMISSION SYSTEM PEAK LOAD
  1. Report the monthly peak load on the respondent's transmission system. If the respondent has two or more power systems which are not physically integrated, furnish the required information for each non-integrated system.
  2. Report on Column (b) by month the transmission system's peak load.
  3. Report on Columns (c ) and (d) the specified information for each monthly transmission - system peak load reported on Column (b).
  4. Report on Columns (e) through (j) by month the system' monthly maximum megawatt load by statistical classifications. See General Instruction for the definition of each statistical classification.
Line No.
Month
(a)
Monthly Peak MW - Total
(b)
Day of Monthly Peak
(c)
Hour of Monthly Peak
(d)
Firm Network Service for Self
(e)
Firm Network Service for Others
(f)
Long-Term Firm Point-to-point Reservations
(g)
Other Long-Term Firm Service
(h)
Short-Term Firm Point-to-point Reservation
(i)
Other Service
(j)
NAME OF SYSTEM: South Dakota Operations
1
January
2
February
3
March
4
Total for Quarter 1
5
April
6
May
7
June
8
Total for Quarter 2
9
July
10
August
11
September
12
Total for Quarter 3
13
October
14
November
15
December
16
Total for Quarter 4
17
Total


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
Monthly ISO/RTO Transmission System Peak Load
  1. Report the monthly peak load on the respondent's transmission system. If the Respondent has two or more power systems which are not physically integrated, furnish the required information for each non-integrated system.
  2. Report on Column (b) by month the transmission system's peak load.
  3. Report on Column (c) and (d) the specified information for each monthly transmission - system peak load reported on Column (b).
  4. Report on Columns (e) through (i) by month the system’s transmission usage by classification. Amounts reported as Through and Out Service in Column (g) are to be excluded from those amounts reported in Columns (e) and (f).
  5. Amounts reported in Column (j) for Total Usage is the sum of Columns (h) and (i).
Line No.
Month
(a)
Monthly Peak MW - Total
(b)
Day of Monthly Peak
(c)
Hour of Monthly Peak
(d)
Import into ISO/RTO
(e)
Exports from ISO/RTO
(f)
Through and Out Service
(g)
Network Service Usage
(h)
Point-to-Point Service Usage
(i)
Total Usage
(j)
NAME OF SYSTEM: South Dakota Operations
1
January
322
15
19
0
0
0
337
15
352
2
February
278
27
14
0
0
0
291
13
304
3
March
268
26
10
0
0
0
280
12
292
4
Total for Quarter 1
0
0
0
908
40
948
5
April
229
2
9
0
0
0
240
11
251
6
May
222
23
18
0
0
0
231
9
240
7
June
347
24
19
0
0
0
361
14
375
8
Total for Quarter 2
0
0
0
832
34
866
9
July
330
26
16
0
0
0
345
15
360
10
August
272
2
17
0
0
0
287
15
302
11
September
290
17
17
0
0
0
302
13
315
12
Total for Quarter 3
0
0
0
934
43
977
13
October
174
10
17
0
0
0
183
9
192
14
November
219
12
8
0
0
0
227
8
235
15
December
285
19
18
0
0
0
296
11
307
16
Total for Quarter 4
0
0
0
706
28
734
17
Total Year to Date/Year
0
0
0
3,380
145
3,525


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

2024-12-31
Year/Period of Report

End of:
2024
/
Q4
ELECTRIC ENERGY ACCOUNT

Report below the information called for concerning the disposition of electric energy generated, purchased, exchanged and wheeled during the year.

Line No. Item
(a)
MegaWatt Hours
(b)
Line No. Item
(a)
MegaWatt Hours
(b)
1
SOURCES OF ENERGY
21
DISPOSITION OF ENERGY
2
Generation (Excluding Station Use):
22
Sales to Ultimate Consumers (Including Interdepartmental Sales)
1,664,951
3
Steam
647,171
23
Requirements Sales for Resale (See instruction 4, page 311.)
4
Nuclear
24
Non-Requirements Sales for Resale (See instruction 4, page 311.)
5
Hydro-Conventional
25
Energy Furnished Without Charge
6
Hydro-Pumped Storage
26
Energy Used by the Company (Electric Dept Only, Excluding Station Use)
8,088
7
Other
436,366
27
Total Energy Losses
8,683
8
Less Energy for Pumping
27.1
Total Energy Stored
9
Net Generation (Enter Total of lines 3 through 8)
1,083,537
28
TOTAL (Enter Total of Lines 22 Through 27.1) MUST EQUAL LINE 20 UNDER SOURCES
1,681,722
10
Purchases (other than for Energy Storage)
598,184
10.1
Purchases for Energy Storage
11
Power Exchanges:
12
Received
0
13
Delivered
0
14
Net Exchanges (Line 12 minus line 13)
15
Transmission For Other (Wheeling)
16
Received
23,231
17
Delivered
23,231
18
Net Transmission for Other (Line 16 minus line 17)
0
19
Transmission By Others Losses
20
TOTAL (Enter Total of Lines 9, 10, 10.1, 14, 18 and 19)
1,681,722


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
MONTHLY PEAKS AND OUTPUT
  1. Report the monthly peak load and energy output. If the respondent has two or more power which are not physically integrated, furnish the required information for each non- integrated system.
  2. Report in column (b) by month the system’s output in Megawatt hours for each month.
  3. Report in column (c) by month the non-requirements sales for resale. Include in the monthly amounts any energy losses associated with the sales.
  4. Report in column (d) by month the system’s monthly maximum megawatt load (60 minute integration) associated with the system.
  5. Report in column (e) and (f) the specified information for each monthly peak load reported in column (d).
Line No.
MonthAxis
Month
(a)
EnergyActivity
Total Monthly Energy
(b)
NonRequiredSalesForResaleEnergy
Monthly Non-Requirement Sales for Resale & Associated Losses
(c)
MonthlyPeakLoad
Monthly Peak - Megawatts
(d)
DayOfMonthlyPeak
Monthly Peak - Day of Month
(e)
HourOfMonthlyPeak
Monthly Peak - Hour
(f)
NAME OF SYSTEM: South Dakota Operations
29
January
135,622
322
15
19
30
February
202,786
278
27
14
31
March
132,505
268
26
10
32
April
140,010
229
2
9
33
May
118,581
222
23
18
34
June
106,563
347
24
19
35
July
110,914
330
26
16
36
August
180,186
272
2
17
37
September
170,060
290
17
17
38
October
141,141
174
10
17
39
November
114,041
219
12
8
40
December
129,313
285
18
18
41
Total
1,681,722
0


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
Steam Electric Generating Plant Statistics

1. Report data for plant in Service only.
2. Large plants are steam plants with installed capacity (name plate rating) of 25,000 Kw or more. Report in this page gas-turbine and internal combustion plants of 10,000 Kw or more, and nuclear plants.
3. Indicate by a footnote any plant leased or operated as a joint facility.
4. If net peak demand for 60 minutes is not available, give data which is available, specifying period.
5. If any employees attend more than one plant, report on line 11 the approximate average number of employees assignable to each plant.
6. If gas is used and purchased on a therm basis report the Btu content or the gas and the quantity of fuel burned converted to Mcf.
7. Quantities of fuel burned (Line 38) and average cost per unit of fuel burned (Line 41) must be consistent with charges to expense accounts 501 and 547 (Line 42) as show on Line 20.
8. If more than one fuel is burned in a plant furnish only the composite heat rate for all fuels burned.
9. Items under Cost of Plant are based on USofA accounts. Production expenses do not include Purchased Power, System Control and Load Dispatching, and Other Expenses Classified as Other Power Supply Expenses.
10. For IC and GT plants, report Operating Expenses, Account Nos. 547 and 549 on Line 25 "Electric Expenses," and Maintenance Account Nos. 553 and 554 on Line 32, "Maintenance of Electric Plant." Indicate plants designed for peak load service. Designate automatically operated plants.
11. For a plant equipped with combinations of fossil fuel steam, nuclear steam, hydro, internal combustion or gas-turbine equipment, report each as a separate plant. However, if a gas-turbine unit functions in a combined cycle operation with a conventional steam unit, include the gas-turbine with the steam plant.
12. If a nuclear power generating plant, briefly explain by footnote (a) accounting method for cost of power generated including any excess costs attributed to research and development; (b) types of cost units used for the various components of fuel cost; and (c) any other informative data concerning plant type fuel used, fuel enrichment type and quantity for the report period and other physical and operating characteristics of plant.

Line No.
Item
(a)
Plant Name:
Aberdeen #1
Plant Name:
Aberdeen #2
Plant Name:
Beethoven Wind
Plant Name:
Big Stone
Plant Name:
Bob Glanzer
Plant Name:
Coyote
Plant Name:
Neal
Plant Name:
Yankton
1
PlantKind
Kind of Plant (Internal Comb, Gas Turb, Nuclear)
(a)
Combustion Turbine
Combustion Turbine
Wind Turbine
(b)
Steam
(c)
Gas Turbine
(d)
Steam
(e)
Steam
(f)
Internal Combustion
2
PlantConstructionType
Type of Constr (Conventional, Outdoor, Boiler, etc)
Conventional
Conventional
Wind Turbine
Conventional
Conventional
Conventional
Conventional
Conventional
3
YearPlantOriginallyConstructed
Year Originally Constructed
1978
2013
2015
1975
2022
1981
1979
1974
4
YearLastUnitOfPlantInstalled
Year Last Unit was Installed
1978
2013
2015
1975
2022
1981
1979
1990
5
InstalledCapacityOfPlant
Total Installed Cap (Max Gen Name Plate Ratings-MW)
28.8
82.2
80
122.85
58.5
45.58
55.56
13.53
6
NetPeakDemandOnPlant
Net Peak Demand on Plant - MW (60 minutes)
28
60
80
112
55.7
43
55
13
7
PlantHoursConnectedToLoad
Plant Hours Connected to Load
0
8,584
7,505
9,766
7,610
2,880
0
8
NetContinuousPlantCapability
Net Continuous Plant Capability (Megawatts)
0
0
79
0
55.7
0
0
0
9
NetContinuousPlantCapabilityNotLimitedByCondenserWater
When Not Limited by Condenser Water
(g)
28
60
0
111
55.7
43
55
13
10
NetContinuousPlantCapabilityLimitedByCondenserWater
When Limited by Condenser Water
(h)
21
52
0
110
55.7
43
55
13
11
PlantAverageNumberOfEmployees
Average Number of Employees
0
9
4
6
0
12
NetGenerationExcludingPlantUse
Net Generation, Exclusive of Plant Use - kWh
0
29,667,000
302,567,000
339,282,000
104,969,000
208,487,000
99,403,000
(l)
172,000
13
CostOfLandAndLandRightsSteamProduction
Cost of Plant: Land and Land Rights
1,314
36,647
0
162,629
192,378
203,882
0
9,631
14
CostOfStructuresAndImprovementsSteamProduction
Structures and Improvements
29,022
10,385,543
14,557,824
10,296,447
15,296,974
10,064,756
8,047,898
348,247
15
CostOfEquipmentSteamProduction
Equipment Costs
3,775,984
38,129,812
100,079,899
147,113,076
71,740,663
42,161,320
57,378,193
7,790,041
16
AssetRetirementCostsSteamProduction
Asset Retirement Costs
0
0
1,351,541
308,664
0
1,412,834
302,405
0
17
CostOfPlant
Total cost (total 13 thru 20)
3,806,321
48,552,002
115,989,263
157,880,816
87,230,015
53,842,792
65,728,497
8,147,919
18
CostPerKilowattOfInstalledCapacity
Cost per KW of Installed Capacity (line 17/5) Including
132
591
1,450
1,285
1,491
1,181
1,183
602
19
OperationSupervisionAndEngineeringExpense
Production Expenses: Oper, Supv, & Engr
0
14,837
77,526
289,406
29,861
255,039
253,408
1,431
20
FuelSteamPowerGeneration
Fuel
0
1,407,252
0
10,224,810
3,245,560
6,643,186
3,041,744
0
21
CoolantsAndWater
Coolants and Water (Nuclear Plants Only)
0
0
0
0
0
0
0
0
22
SteamExpensesSteamPowerGeneration
Steam Expenses
0
0
0
478,172
0
434,615
413,881
0
23
SteamFromOtherSources
Steam From Other Sources
0
0
0
0
0
0
0
0
24
SteamTransferredCredit
Steam Transferred (Cr)
0
0
0
0
0
0
0
0
25
ElectricExpensesSteamPowerGeneration
Electric Expenses
0
646,084
3,218,238
427,705
1,300,279
219,444
1,171
62,303
26
MiscellaneousSteamPowerExpenses
Misc Steam (or Nuclear) Power Expenses
0
0
0
714,766
0
255,304
187,353
0
27
RentsSteamPowerGeneration
Rents
0
0
0
0
0
6,385
31,093
0
28
Allowances
Allowances
0
0
0
0
0
0
0
0
29
MaintenanceSupervisionAndEngineeringSteamPowerGeneration
Maintenance Supervision and Engineering
0
14,837
0
160,641
29,861
77,923
131,429
1,431
30
MaintenanceOfStructuresSteamPowerGeneration
Maintenance of Structures
0
0
0
159,132
0
104,473
74,216
0
31
MaintenanceOfBoilerPlantSteamPowerGeneration
Maintenance of Boiler (or reactor) Plant
0
0
0
1,682,850
0
697,694
372,143
0
32
MaintenanceOfElectricPlantSteamPowerGeneration
Maintenance of Electric Plant
0
942,344
33,765
123,112
115,292
46,589
136,891
14,274
33
MaintenanceOfMiscellaneousSteamPlant
Maintenance of Misc Steam (or Nuclear) Plant
0
0
0
157,460
0
205,962
111,907
0
34
PowerProductionExpensesSteamPower
Total Production Expenses
0
3,025,354
3,329,529
14,418,053
4,720,853
8,946,613
4,755,235
79,439
35
ExpensesPerNetKilowattHour
Expenses per Net kWh
0
0.101977
0.011004
0.042496
0.044974
0.042912
0.047838
0.461855
35
FuelKindAxis
Plant Name
Aberdeen #1
Aberdeen #2
Aberdeen #2
Big Stone
Big Stone
Big Stone
Bob Glanzer
Coyote
Coyote
Coyote
Neal
Neal
Yankton
36
FuelKind
Fuel Kind
Oil
Gas
Oil
Coal
Lime
Oil
Gas
Coal
Lime
Oil
Coal
Oil
Oil
37
FuelUnit
Fuel Unit
bbl
MMBTU
bbl
T
T
bbl
MMBTU
T
T
bbl
T
bbl
bbl
38
QuantityOfFuelBurned
Quantity (Units) of Fuel Burned
0
296,891
3,768
257,865
2,220
1,510
835,272
189,914
1,398
1,096
61,855
2,268
0
39
FuelBurnedAverageHeatContent
Avg Heat Cont - Fuel Burned (btu/indicate if nuclear)
138,000
1,000
140,000
4,795
0
140,000
1,000
6,963
0
140,000
8,593
139,000
138,000
40
AverageCostOfFuelPerUnitAsDelivered
Avg Cost of Fuel/unit, as Delvd f.o.b. during year
1.717
123.782
36.264
217.328
109.968
3.757
32
142.81
124.92
44.874
113.248
41
AverageCostOfFuelPerUnitBurned
Average Cost of Fuel per Unit Burned
1.717
123.783
36.264
217.328
109.968
3.757
32
142.81
124.92
44.873
113.248
42
AverageCostOfFuelBurnedPerMillionBritishThermalUnit
Average Cost of Fuel Burned per Million BTU
1.717
21.051
3.781
0
18.704
3.757
2.301
0
21.245
2.611
19.4
43
AverageCostOfFuelBurnedPerKilowattHourNetGeneration
Average Cost of Fuel Burned per kWh Net Gen
0.0474
(m)
0.0474
(n)
0.0301
0.0301
0.0301
0.0309
(o)
0.0319
0.0319
0.0319
(p)
0.0306
0.0306
44
AverageBritishThermalUnitPerKilowattHourNetGeneration
Average BTU per kWh Net Generation
10,754.267
(q)
10,754.267
(r)
7,314.893
7,314.893
7,314.893
7,957.397
(s)
6,373.614
6,373.614
6,373.614
(t)
10,827.446
10,827.446


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: PlantKind
Designed for peak load service.
(b) Concept: PlantKind

Big Stone - Respondent's share is 23.4%. Generation expenses and revenue are shared on ownership basis. This page represents the respondent's share of plant costs, production expenses and other data.

(c) Concept: PlantKind

Designed for peak load service.

(d) Concept: PlantKind

Coyote - Respondent's share is 10%. Generation expenses and revenue are shared on ownership basis. This page represents the respondent's share of plant costs, production expenses and other data.

(e) Concept: PlantKind

Neal #4 - Respondent's share is 8.681%. Generation expenses and revenue are shared on ownership basis. This page represents the respondent's share of plant costs, production expenses and other data.

(f) Concept: PlantKind

Designed for peak load service.

(g) Concept: NetContinuousPlantCapabilityNotLimitedByCondenserWater

Site 40 F., Base

(h) Concept: NetContinuousPlantCapabilityLimitedByCondenserWater

Site 80 F., Base

(i) Concept: PlantAverageNumberOfEmployees

All plant employees are employed by the plant operator, Otter Tail Power Co.

(j) Concept: PlantAverageNumberOfEmployees

All plant employees are employed by the plant operator, Otter Tail Power Co.

(k) Concept: PlantAverageNumberOfEmployees

All plant employees are employed by the plant operator, Mid American Energy

(l) Concept: NetGenerationExcludingPlantUse

Station power use exceeded generation.

(m) Concept: AverageCostOfFuelBurnedPerKilowattHourNetGeneration

Average cost of all fuels burned per net KWh generated.

(n) Concept: AverageCostOfFuelBurnedPerKilowattHourNetGeneration
Average cost of all fuels burned per net KWh generated.
(o) Concept: AverageCostOfFuelBurnedPerKilowattHourNetGeneration
Average cost of all fuels burned per net KWh generated.
(p) Concept: AverageCostOfFuelBurnedPerKilowattHourNetGeneration
Average cost of all fuels burned per net KWh generated.
(q) Concept: AverageBritishThermalUnitPerKilowattHourNetGeneration

Average BTU per net KWh generated for all fuels.

(r) Concept: AverageBritishThermalUnitPerKilowattHourNetGeneration
Average BTU per net KWh generated for all fuels.
(s) Concept: AverageBritishThermalUnitPerKilowattHourNetGeneration
Average BTU per net KWh generated for all fuels.
(t) Concept: AverageBritishThermalUnitPerKilowattHourNetGeneration
Average BTU per net KWh generated for all fuels.

Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
Hydroelectric Generating Plant Statistics
  1. Large plants are hydro plants of 10,000 Kw or more of installed capacity (name plate ratings).
  2. If any plant is leased, operated under a license from the Federal Energy Regulatory Commission, or operated as a joint facility, indicate such facts in a footnote. If licensed project, give project number.
  3. If net peak demand for 60 minutes is not available, give that which is available specifying period.
  4. If a group of employees attends more than one generating plant, report on line 11 the approximate average number of employees assignable to each plant.
  5. The items under Cost of Plant represent accounts or combinations of accounts prescribed by the Uniform System of Accounts. Production Expenses do not include Purchased Power, System control and Load Dispatching, and Other Expenses classified as "Other Power Supply Expenses."
  6. Report as a separate plant any plant equipped with combinations of steam, hydro, internal combustion engine, or gas turbine equipment.
Line No.
Item
(a)
FERC Licensed Project No.
Plant Name:
FERC Licensed Project No.
Plant Name:
FERC Licensed Project No.
Plant Name:
FERC Licensed Project No.
Plant Name:
FERC Licensed Project No.
Plant Name:
1
PlantKind
Kind of Plant (Run-of-River or Storage)
2
PlantConstructionType
Plant Construction type (Conventional or Outdoor)
3
YearPlantOriginallyConstructed
Year Originally Constructed
4
YearLastUnitOfPlantInstalled
Year Last Unit was Installed
5
InstalledCapacityOfPlant
Total installed cap (Gen name plate Rating in MW)
6
NetPeakDemandOnPlant
Net Peak Demand on Plant-Megawatts (60 minutes)
7
PlantHoursConnectedToLoad
Plant Hours Connect to Load
8
NetPlantCapabilityAbstract
Net Plant Capability (in megawatts)
9
NetPlantCapabilityUnderMostFavorableOperatingConditions
(a) Under Most Favorable Oper Conditions
10
NetPlantCapabilityUnderMostAdverseOperatingConditions
(b) Under the Most Adverse Oper Conditions
11
PlantAverageNumberOfEmployees
Average Number of Employees
12
NetGenerationExcludingPlantUse
Net Generation, Exclusive of Plant Use - kWh
13
CostOfPlantAbstract
Cost of Plant
14
CostOfLandAndLandRightsHydroelectricProduction
Land and Land Rights
15
CostOfStructuresAndImprovementsHydroelectricProduction
Structures and Improvements
16
CostOfReservoirsDamsAndWaterwaysHydroelectricProduction
Reservoirs, Dams, and Waterways
17
EquipmentCostsHydroelectricProduction
Equipment Costs
18
CostOfRoadsRailroadsAndBridgesHydroelectricProduction
Roads, Railroads, and Bridges
19
AssetRetirementCostsHydroelectricProduction
Asset Retirement Costs
20
CostOfPlant
Total cost (total 13 thru 20)
21
CostPerKilowattOfInstalledCapacity
Cost per KW of Installed Capacity (line 20 / 5)
22
ProductionExpensesAbstract
Production Expenses
23
OperationSupervisionAndEngineeringExpense
Operation Supervision and Engineering
24
WaterForPower
Water for Power
25
HydraulicExpenses
Hydraulic Expenses
26
ElectricExpensesHydraulicPowerGeneration
Electric Expenses
27
MiscellaneousHydraulicPowerGenerationExpenses
Misc Hydraulic Power Generation Expenses
28
RentsHydraulicPowerGeneration
Rents
29
MaintenanceSupervisionAndEngineeringHydraulicPowerGeneration
Maintenance Supervision and Engineering
30
MaintenanceOfStructuresHydraulicPowerGeneration
Maintenance of Structures
31
MaintenanceOfReservoirsDamsAndWaterways
Maintenance of Reservoirs, Dams, and Waterways
32
MaintenanceOfElectricPlantHydraulicPowerGeneration
Maintenance of Electric Plant
33
MaintenanceOfMiscellaneousHydraulicPlant
Maintenance of Misc Hydraulic Plant
34
PowerProductionExpensesHydraulicPower
Total Production Expenses (total 23 thru 33)
35
ExpensesPerNetKilowattHour
Expenses per net kWh


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
Pumped Storage Generating Plant Statistics
  1. Large plants and pumped storage plants of 10,000 Kw or more of installed capacity (name plate ratings).
  2. If any plant is leased, operating under a license from the Federal Energy Regulatory Commission, or operated as a joint facility, indicate such facts in a footnote. Give project number.
  3. If net peak demand for 60 minutes is not available, give that which is available, specifying period.
  4. If a group of employees attends more than one generating plant, report on Line 8 the approximate average number of employees assignable to each plant.
  5. The items under Cost of Plant represent accounts or combinations of accounts prescribed by the Uniform System of Accounts. Production Expenses do not include Purchased Power System Control and Load Dispatching, and Other Expenses classified as "Other Power Supply Expenses."
  6. Pumping energy (Line 10) is that energy measured as input to the plant for pumping purposes.
  7. Include on Line 36 the cost of energy used in pumping into the storage reservoir. When this item cannot be accurately computed leave Lines 36, 37 and 38 blank and describe at the bottom of the schedule the company's principal sources of pumping power, the estimated amounts of energy from each station or other source that individually provides more than 10 percent of the total energy used for pumping, and production expenses per net MWH as reported herein for each source described. Group together stations and other resources which individually provide less than 10 percent of total pumping energy. If contracts are made with others to purchase power for pumping, give the supplier contract number, and date of contract.
Line No.
Item
(a)
FERC Licensed Project No.
Plant Name:
FERC Licensed Project No.
Plant Name:
FERC Licensed Project No.
Plant Name:
FERC Licensed Project No.
Plant Name:
1
PlantConstructionType
Type of Plant Construction (Conventional or Outdoor)
2
YearPlantOriginallyConstructed
Year Originally Constructed
3
YearLastUnitOfPlantInstalled
Year Last Unit was Installed
4
InstalledCapacityOfPlant
Total installed cap (Gen name plate Rating in MW)
5
NetPeakDemandOnPlant
Net Peak Demaind on Plant-Megawatts (60 minutes)
6
PlantHoursConnectedToLoad
Plant Hours Connect to Load While Generating
7
NetContinuousPlantCapability
Net Plant Capability (in megawatts)
8
PlantAverageNumberOfEmployees
Average Number of Employees
9
NetGenerationExcludingPlantUse
Generation, Exclusive of Plant Use - kWh
10
EnergyUsedForPumping
Energy Used for Pumping
11
NetOutputForLoad
Net Output for Load (line 9 - line 10) - Kwh
12
CostOfPlantAbstract
Cost of Plant
13
CostOfLandAndLandRightsPumpedStoragePlant
Land and Land Rights
14
CostOfStructuresAndImprovementsPumpedStoragePlant
Structures and Improvements
15
CostOfReservoirsDamsAndWaterwaysPumpedStoragePlant
Reservoirs, Dams, and Waterways
16
CostOfWaterWheelsTurbinesAndGeneratorsPumpedStoragePlant
Water Wheels, Turbines, and Generators
17
CostOfAccessoryElectricEquipmentPumpedStoragePlant
Accessory Electric Equipment
18
CostOfMiscellaneousPowerPlantEquipmentPumpedStoragePlant
Miscellaneous Powerplant Equipment
19
CostOfRoadsRailroadsAndBridgesPumpedStoragePlant
Roads, Railroads, and Bridges
20
AssetRetirementCostsPumpedStoragePlant
Asset Retirement Costs
21
CostOfPlant
Total cost (total 13 thru 20)
22
CostPerKilowattOfInstalledCapacity
Cost per KW of installed cap (line 21 / 4)
23
ProductionExpensesAbstract
Production Expenses
24
OperationSupervisionAndEngineeringExpense
Operation Supervision and Engineering
25
WaterForPower
Water for Power
0
0
0
0
26
PumpedStorageExpenses
Pumped Storage Expenses
27
ElectricExpensesPumpedStoragePlant
Electric Expenses
28
MiscellaneousPumpedStoragePowerGenerationExpenses
Misc Pumped Storage Power generation Expenses
29
RentsPumpedStoragePlant
Rents
30
MaintenanceSupervisionAndEngineeringPumpedStoragePlant
Maintenance Supervision and Engineering
31
MaintenanceOfStructuresPumpedStoragePlant
Maintenance of Structures
32
MaintenanceOfReservoirsDamsAndWaterwaysPumpedStoragePlant
Maintenance of Reservoirs, Dams, and Waterways
33
MaintenanceOfElectricPlantPumpedStoragePlant
Maintenance of Electric Plant
34
MaintenanceOfMiscellaneousPumpedStoragePlant
Maintenance of Misc Pumped Storage Plant
35
PowerProductionExpenseBeforePumpingExpenses
Production Exp Before Pumping Exp (24 thru 34)
36
PumpingExpenses
Pumping Expenses
37
PowerProductionExpensesPumpedStoragePlant
Total Production Exp (total 35 and 36)
38
ExpensesPerNetKilowattHour
Expenses per kWh (line 37 / 9)
39
ExpensesPerNetKilowattHourGenerationAndPumping
Expenses per KWh of Generation and Pumping (line 37/(line 9 + line 10))


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
GENERATING PLANT STATISTICS (Small Plants)
  1. Small generating plants are steam plants of, less than 25,000 Kw; internal combustion and gas turbine-plants, conventional hydro plants and pumped storage plants of less than 10,000 Kw installed capacity (name plate rating).
  2. Designate any plant leased from others, operated under a license from the Federal Energy Regulatory Commission, or operated as a joint facility, and give a concise statement of the facts in a footnote. If licensed project, give project number in footnote.
  3. List plants appropriately under subheadings for steam, hydro, nuclear, internal combustion and gas turbine plants. For nuclear, see instruction 11, Page 402.
  4. If net peak demand for 60 minutes is not available, give the which is available, specifying period.
  5. If any plant is equipped with combinations of steam, hydro internal combustion or gas turbine equipment, report each as a separate plant. However, if the exhaust heat from the gas turbine is utilized in a steam turbine regenerative feed water cycle, or for preheated combustion air in a boiler, report as one plant.
Production Expenses
Line No.
PlantName
Name of Plant
(a)
YearPlantOriginallyConstructed
Year Orig. Const.
(b)
InstalledCapacityOfPlant
Installed Capacity Name Plate Rating (MW)
(c)
NetPeakDemandOnPlant
Net Peak Demand MW (60 min)
(d)
NetGenerationExcludingPlantUse
Net Generation Excluding Plant Use
(e)
CostOfPlant
Cost of Plant
(f)
PlantCostPerMw
Plant Cost (Incl Asset Retire. Costs) Per MW
(g)
OperatingExpensesExcludingFuel
Operation Exc'l. Fuel
(h)
FuelProductionExpenses
Fuel Production Expenses
(i)
MaintenanceProductionExpenses
Maintenance Production Expenses
(j)
FuelKind
Kind of Fuel
(k)
FuelCostPerMmbtus
Fuel Costs (in cents (per Million Btu)
(l)
GenerationType
Generation Type
(m)
1
Clark
1970
2.75
2.72
124,000
955,824
347,572
13,728
760
47,892
Oil
1,713.741
Internal Combustion
2
Faulkton
1969
2.75
2.5
122,000
1,682,420
611,789
3,937
375
43,418
Oil
2,027.533
Internal Combustion
3
Highmore
1948
4.785
4.68
0
50,385
10,530
0
0
0
Oil
0
Internal Combustion
4
Redfield
1962
4.08
3.96
0
554,692
135,954
0
0
0
Oil/Gas
0
Internal Combustion
5
Mobile B
1991
1.75
1.75
61,000
563,424
321,956
2,389
1,456
17,288
Oil
3,768.646
Internal Combustion
6
Mobile C
2008
2.5
2
54,000
1,064,946
425,978
2,164
1,045
19,780
Oil
2,983.699
Internal Combustion
7
Mobile 1
2020
1
1
37,000
1,293,539
1,293,539
0
2,507
17,193
Oil
2,235.137
Internal Combustion
8
Mobile 2
2020
1
1
44,000
1,293,539
1,293,539
25
1,457
18,792
Oil
3,011.122
Internal Combustion
9
Mobile 3
2020
1
1
32,000
1,293,539
1,293,539
7,776
3,506
15,229
Oil
2,399.886
Internal Combustion
10
Mobile 4
2020
1
1
47,000
1,293,539
1,293,539
186
1,561
16,521
Oil
2,963.535
Internal Combustion
11
Mobile 5
2020
1
1
36,000
1,293,539
1,293,539
0
2,931
14,602
Oil
2,593.406
Internal Combustion
12
Mobile 6
2020
1
1
41,000
1,293,539
1,293,539
0
1,687
11,962
Oil
3,026.032
Internal Combustion
13
Mobile 7
2020
1
1
31,000
1,293,539
1,293,539
0
1,644
16,780
Oil
3,064.711
Internal Combustion
14
Mobile 8
2020
1
1
37,000
1,293,539
1,293,539
948
2,558
15,032
Oil
2,193.181
Internal Combustion
15
Total
(a)
666,000
15,220,003
12,202,091
31,153
21,487
254,489
31,980.628999999997


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: NetGenerationExcludingPlantUse

Net Generation:

 

Page 402-403

                                1,084,203

Page 410-411

                                        (666)

Ties to Page 401, line 9

                                1,083,537

 

 

Production Expenses:

 

Total Per Form 1 Page 402, line 34

39,275,077

Total Per Form 1 Page 410, line 26

307,129

Ties to total of Page 320, lines 21, 59, and 74, column (b)

39,582,206


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
ENERGY STORAGE OPERATIONS (Large Plants)
  1. Large Plants are plants of 10,000 Kw or more.
  2. In columns (a) (b) and (c) report the name of the energy storage project, functional classification (Production, Transmission, Distribution), and location.
  3. In column (d), report Megawatt hours (MWH) purchased, generated, or received in exchange transactions for storage.
  4. In columns (e), (f) and (g) report MWHs delivered to the grid to support production, transmission and distribution. The amount reported in column (d) should include MWHs delivered/provided to a generator’s own load requirements or used for the provision of ancillary services.
  5. In columns (h), (i), and (j) report MWHs lost during conversion, storage and discharge of energy.
  6. In column (k) report the MWHs sold.
  7. In column (l), report revenues from energy storage operations. In a footnote, disclose the revenue accounts and revenue amounts related to the income generating activity.
  8. In column (m), report the cost of power purchased for storage operations and reported in Account 555.1, Power Purchased for Storage Operations. If power was purchased from an affiliated seller specify how the cost of the power was determined. In columns (n) and (o), report fuel costs for storage operations associated with self-generated power included in Account 501 and other costs associated with self-generated power.
  9. In columns (q), (r) and (s) report the total project plant costs including but not exclusive of land and land rights, structures and improvements, energy storage equipment, turbines, compressors, generators, switching and conversion equipment, lines and equipment whose primary purpose is to integrate or tie energy storage assets into the power grid, and any other costs associated with the energy storage project included in the property accounts listed.
Line No.
Name of the Energy Storage Project
(a)
Functional Classification
(b)
Location of the Project
(c)
MWHs
(d)
MWHs delivered to the grid to support Production
(e)
MWHs delivered to the grid to support Transmission
(f)
MWHs delivered to the grid to support Distribution
(g)
MWHs Lost During Conversion, Storage and Discharge of Energy Production
(h)
MWHs Lost During Conversion, Storage and Discharge of Energy Transmission
(i)
MWHs Lost During Conversion, Storage and Discharge of Energy Distribution
(j)
MWHs Sold
(k)
Revenues from Energy Storage Operations
(l)
Power Purchased for Storage Operations (555.1) (Dollars)
(m)
Fuel Costs from associated fuel accounts for Storage Operations Associated with Self- Generated Power (Dollars)
(n)
Other Costs Associated with Self-Generated Power (Dollars)
(o)
Account for Project Costs
(p)
Production (Dollars)
(q)
Transmission (Dollars)
(r)
Distribution (Dollars)
(s)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35 TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
ENERGY STORAGE OPERATIONS (Small Plants)
  1. Small Plants are plants less than 10,000 Kw.
  2. In columns (a), (b) and (c) report the name of the energy storage project, functional classification (Production, Transmission, Distribution), and location.
  3. In column (d), report project plant cost including but not exclusive of land and land rights, structures and improvements, energy storage equipment and any other costs associated with the energy storage project.
  4. In column (e), report operation expenses excluding fuel, (f), maintenance expenses, (g) fuel costs for storage operations and (h) cost of power purchased for storage operations and reported in Account 555.1, Power Purchased for Storage Operations. If power was purchased from an affiliated seller specify how the cost of the power was determined.
  5. If any other expenses, report in column (i) and footnote the nature of the item(s).
BALANCE AT BEGINNING OF YEAR
Line No.
Name of the Energy Storage Project
(a)
Functional Classification
(b)
Location of the Project
(c)
Project Cost
(d)
Operations (Excluding Fuel used in Storage Operations)
(e)
Maintenance
(f)
Cost of fuel used in storage operations
(g)
Account No. 555.1, Power Purchased for Storage Operations
(h)
Other Expenses
(i)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36 TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
TRANSMISSION LINE STATISTICS
  1. Report information concerning transmission lines, cost of lines, and expenses for year. List each transmission line having nominal voltage of 132 kilovolts or greater. Report transmission lines below these voltages in group totals only for each voltage. If required by a State commission to report individual lines for all voltages, do so but do not group totals for each voltage under 132 kilovolts.
  2. Transmission lines include all lines covered by the definition of transmission system plant as given in the Uniform System of Accounts. Do not report substation costs and expenses on this page.
  3. Exclude from this page any transmission lines for which plant costs are included in Account 121, Nonutility Property.
  4. Indicate whether the type of supporting structure reported in column (e) is: (1) single pole wood or steel; (2) H-frame wood, or steel poles; (3) tower; or (4) underground construction If a transmission line has more than one type of supporting structure, indicate the mileage of each type of construction by the use of brackets and extra lines. Minor portions of a transmission line of a different type of construction need not be distinguished from the remainder of the line.
  5. Report in columns (f) and (g) the total pole miles of each transmission line. Show in column (f) the pole miles of line on structures the cost of which is reported for the line designated; conversely, show in column (g) the pole miles of line on structures the cost of which is reported for another line. Report pole miles of line on leased or partly owned structures in column (g). In a footnote, explain the basis of such occupancy and state whether expenses with respect to such structures are included in the expenses reported for the line designated.
  6. Do not report the same transmission line structure twice. Report Lower voltage Lines and higher voltage lines as one line. Designate in a footnote if you do not include Lower voltage lines with higher voltage lines. If two or more transmission line structures support lines of the same voltage, report the pole miles of the primary structure in column (f) and the pole miles of the other line(s) in column (g).
  7. Designate any transmission line or portion thereof for which the respondent is not the sole owner. If such property is leased from another company, give name of lessor, date and terms of Lease, and amount of rent for year. For any transmission line other than a leased line, or portion thereof, for which the respondent is not the sole owner but which the respondent operates or shares in the operation of, furnish a succinct statement explaining the arrangement and giving particulars (details) of such matters as percent ownership by respondent in the line, name of co-owner, basis of sharing expenses of the Line, and how the expenses borne by the respondent are accounted for, and accounts affected. Specify whether lessor, co-owner, or other party is an associated company.
  8. Designate any transmission line leased to another company and give name of Lessee, date and terms of lease, annual rent for year, and how determined. Specify whether lessee is an associated company.
  9. Base the plant cost figures called for in columns (j) to (l) on the book cost at end of year.
DESIGNATION VOLTAGE (KV) - (Indicate where other than 60 cycle, 3 phase) LENGTH (Pole miles) - (In the case of underground lines report circuit miles) COST OF LINE (Include in column (j) Land, Land rights, and clearing right-of-way) EXPENSES, EXCEPT DEPRECIATION AND TAXES
Line No.
TransmissionLineStartPoint
From
TransmissionLineEndPoint
To
OperatingVoltageOfTransmissionLine
Operating
DesignedVoltageOfTransmissionLine
Designated
SupportingStructureOfTransmissionLineType
Type of Supporting Structure
LengthForStandAloneTransmissionLines
On Structure of Line Designated
LengthForTransmissionLinesAggregatedWithOtherStructures
On Structures of Another Line
NumberOfTransmissionCircuits
Number of Circuits
SizeOfConductorAndMaterial
Size of Conductor and Material
CostOfLandAndLandRightsTransmissionLines
Land
ConstructionAndOtherCostsTransmissionLines
Construction Costs
OverallCostOfTransmissionLine
Total Costs
OperatingExpensesOfTransmissionLine
Operation Expenses
MaintenanceExpensesOfTransmissionLine
Maintenance Expenses
RentExpensesOfTransmissionLine
Rents
OverallExpensesOfTransmissionLine
Total Expenses
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(j)
(k)
(l)
(m)
(n)
(o)
(p)
1
(a)
Big Stone SD
Gary, SD
230
230
18
1
1272 MCM
8,674
1,278,111
1,286,785
2
(b)
Coyote, ND
Center, ND
345
345
23
1
954 MCM
223,226
3,211,876
3,435,102
3
(c)
Neal, IA
Hinton, IA
345
345
24
1
954 MCM
16,579
616,871
633,450
4
Less non-NWE 345kV partial ownership miles
22
5
Various
115
359
6
Various
69
262
7
Various
34.5
685
Various
1,625,928
100,187,136
101,813,064
324,613
195,781
19,732
540,127
36 TOTAL
1,349
0
3
1,874,407
105,293,994
107,168,401
324,613
195,781
19,732
540,127


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: TransmissionLineStartPoint

Big Stone - Respondent's share is 23.4%. Generation expenses and revenue are shared on ownership basis. Operator issues an operating report monthly. Production accounts are generally affected. None of the co-owners are associated companies. Data reported is respondent's share plus any company expense.

(b) Concept: TransmissionLineStartPoint

Coyote - Respondent's share is 10%. Generation expenses and revenue are shared on ownership basis. Operator issues an operating report monthly.Production accounts are generally affected. None of the co-owners are associated companies. Data reported is respondent's share plus any company expense.

(c) Concept: TransmissionLineStartPoint

Neal #4 - Respondent's share is 8.681%. Generation expenses and revenue are shared on ownership basis. Operator issues an operating report monthly. Production accounts are generally affected. None of the co-owners are associated companies. Data reported is respondent's share plus any company expense.


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
TRANSMISSION LINES ADDED DURING YEAR
  1. Report below the information called for concerning Transmission lines added or altered during the year. It is not necessary to report minor revisions of lines.
  2. Provide separate subheadings for overhead and under- ground construction and show each transmission line separately. If actual costs of competed construction are not readily available for reporting columns (l) to (o), it is permissible to report in these columns the costs. Designate, however, if estimated amounts are reported. Include costs of Clearing Land and Rights-of-Way, and Roads and Trails, in column (l) with appropriate footnote, and costs of Underground Conduit in column (m).
  3. If design voltage differs from operating voltage, indicate such fact by footnote; also where line is other than 60 cycle, 3 phase, indicate such other characteristic.
LINE DESIGNATION SUPPORTING STRUCTURE CIRCUITS PER STRUCTURE CONDUCTORS LINE COST
Line No.
TransmissionLineStartPoint
From
TransmissionLineEndPoint
To
LengthOfTransmissionLineAdded
Line Length in Miles
SupportingStructureOfTransmissionLineType
Type
AverageNumberOfSupportingStructuresOfTransmissionLinePerMiles
Average Number per Miles
NumberOfTransmissionCircuitsPerStructurePresent
Present
NumberOfTransmissionCircuitsPerStructureUltimate
Ultimate
ConductorSize
Size
ConductorSpecification
Specification
ConductorConfigurationAndSpacing
Configuration and Spacing
OperatingVoltageOfTransmissionLine
Voltage KV (Operating)
CostOfLandAndLandRightsTransmissionLinesAdded
Land and Land Rights
CostOfPolesTowersAndFixturesTransmissionLinesAdded
Poles, Towers and Fixtures
CostOfConductorsAndDevicesTransmissionLinesAdded
Conductors and Devices
Asset Retire. Costs
CostOfTransmissionLinesAdded
Total
SupportingStructureConstructionType
Construction
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(j)
(k)
(l)
(m)
(n)
(o)
(p)
(q)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
TOTAL


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
SUBSTATIONS
  1. Report below the information called for concerning substations of the respondent as of the end of the year.
  2. Substations which serve only one industrial or street railway customer should not be listed below.
  3. Substations with capacities of Less than 10 MVA except those serving customers with energy for resale, may be grouped according to functional character, but the number of such substations must be shown.
  4. Indicate in column (b) the functional character of each substation, designating whether transmission or distribution and whether attended or unattended. At the end of the page, summarize according to function the capacities reported for the individual stations in column (f).
  5. Show in columns (I), (j), and (k) special equipment such as rotary converters, rectifiers, condensers, etc. and auxiliary equipment for increasing capacity.
  6. Designate substations or major items of equipment leased from others, jointly owned with others, or operated otherwise than by reason of sole ownership by the respondent. For any substation or equipment operated under lease, give name of lessor, date and period of lease, and annual rent. For any substation or equipment operated other than by reason of sole ownership or lease, give name of co-owner or other party, explain basis of sharing expenses or other accounting between the parties, and state amounts and accounts affected in respondent's books of account. Specify in each case whether lessor, co-owner, or other party is an associated company.
Character of Substation VOLTAGE (In MVa) Conversion Apparatus and Special Equipment
Line No.
SubstationNameAndLocation
Name and Location of Substation
(a)
SubstationCharacterDescription
Transmission or Distribution
(b)
SubstationCharacterAttendedOrUnattended
Attended or Unattended
(b-1)
PrimaryVoltageLevel
Primary Voltage (In MVa)
(c)
SecondaryVoltageLevel
Secondary Voltage (In MVa)
(d)
TertiaryVoltageLevel
Tertiary Voltage (In MVa)
(e)
SubstationInServiceCapacity
Capacity of Substation (In Service) (In MVa)
(f)
NumberOfTransformersInService
Number of Transformers In Service
(g)
Number of Spare Transformers
(h)
ConversionApparatusAndSpecialEquipmentType
Type of Equipment
(i)
NumberOfConversionApparatusAndSpecialEquipmentUnits
Number of Units
(j)
CapacityOfConversionApparatusAndSpecialEquipment
Total Capacity (In MVa)
(k)
1
Groton Basin Operated (2B)
Transmission
Unattended
345
115
195
1
2
Webster NW (3A)
Transmission
Unattended
69
4.16
5
1
3
Clark Jct. (6B)
Transmission
Unattended
69
4.16
7
1
Fans
5
4
WMU West Sub (6D)
Transmission
Unattended
115
69
25
1
Fans
13
5
Yankton East Plant (15B)
Transmission
Unattended
34.4
12.5
7
1
6
Yankton East Plant (15B)
Transmission
Unattended
34.4
12.5
20
1
Fans
8
7
Chamberlain (19B)
Transmission
Unattended
69
12.5
12
1
Fans
3
8
WAPA Mt. Vernon (19D)
Transmission
Unattended
115
69
13.8
40
1
Fans
16
9
Stickney Jct. (19E)
Transmission
Unattended
69
34.5
25
1
Fans
10
10
Aberdeen Industrial Park (29A)
Transmission
Unattended
115
34.4
60
1
Fans
36
11
Redfield (30A)
Transmission
Unattended
115
34.4
42
1
Fans
17
12
Redfield (30A)
Transmission
Unattended
34.4
4.16
1
3
13
Redfield (30A)
Transmission
Unattended
67
34.4
20
1
Fans, Pumps
8
14
Redfield (30A)
Transmission
Unattended
34.4
12.5
4
1
Fans
1
15
WAPA Broadland (30B)
Transmission
Unattended
230
115
100
3
16
Aberdeen Siebrecht (30C)
Transmission
Unattended
115
34.4
60
1
Fans
24
17
Aberdeen Siebrecht (30C)
Transmission
Unattended
34.5
13.2
28
1
Fans
13
18
Aberdeen Siebrecht (30C)
Transmission
Unattended
34.5
12.47
14
1
Fans
2
19
Aberdeen Siebrecht (30C)
Transmission
Unattended
115
13.8
84
1
Fans
34
20
Huron West Park (30D)
Transmission
Unattended
67
34.4
20
1
Fans
8
21
Huron West Park (30D)
Transmission
Unattended
110
69
60
1
Fans
24
22
Huron West Park (30D)
Transmission
Unattended
110
69
60
1
Fans
24
23
Dakota Access (30E)
Transmission
Unattended
115
4.16
20
1
Fans
6
24
Dakota Access (30E)
Transmission
Unattended
115
4.16
20
1
Fans
6
25
Mitchell (31A)
Transmission
Unattended
115
34.4
40
1
Fans
16
26
Mitchell (31A)
Transmission
Unattended
115
34.4
40
1
Fans
16
27
Mitchell NW (31B)
Transmission
Unattended
115
34.4
42
1
Fans
17
28
Huron Gas Turbine Plant (34A)
Transmission
Unattended
69
12.47
20
1
Fans
8
29
Huron Gas Turbine Plant (34A)
Transmission
Unattended
69
24.9
14
1
Fans
3
30
Huron Gas Turbine Plant (34A)
Transmission
Unattended
69
13.8
75
1
Fans
45
31
Highmore Plant (35C)
Transmission
Unattended
67
34.4
11
1
Fans
3
32
Highmore Plant (35C)
Transmission
Unattended
34.5
4.16
6
1
Fans
1
33
Highmore ER Interconnect (35E)
Transmission
Unattended
69
69
20
8
34
Aberdeen (40B)
Transmission
Unattended
115
12.47
25
1
Fans
10
35
Aberdeen (40B)
Transmission
Unattended
115
34.4
60
1
Fans
24
36
Tripp Jct. (42A)
Transmission
Unattended
115
34.4
40
1
Fans
16
37
Yankton Jct. (43A)
Transmission
Unattended
115
34.4
42
1
Fans
17
38
Yankton Jct. (43A)
Transmission
Unattended
115
34.4
42
1
Fans
17
39
Menno Jct. (43B)
Transmission
Unattended
115
34.4
20
1
Fans
8
40
Yankton East (44A)
Transmission
Unattended
115
34.5
60
1
Fans
41
Yankton East (44A)
Transmission
Unattended
34.4
12.5
25
1
Fans
25
42
Schroeder (Beethoven Wind (46A)
Transmission
Unattended
115
34.5
83
1
Fans
33
43
Big Stone Plant (50A)
Transmission
Unattended
230
115
13.8
54
1
1
44
Big Stone Plant (50A)
Transmission
Unattended
22.9
230
123
1
45
Neal #4, Iowa (54A)
Transmission
Unattended
24
345
61
1
1
46
Coyote, North Dakota (56A)
Transmission
Unattended
22.9
345
48
1
1
47
Redfield City (82A)
Transmission
Unattended
34.4
4.16
15
1
Fans
2
48
Yankton Hilltop (89A)
Transmission
Unattended
34.4
12.5
24
1
Fans
13
49
12 others under 10,000 KVA
Transmission
Unattended
49.375
10
50
Alpena (110C)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
51
Platte (113C)
Distribution
Unattended
34.4
4.16
5
1
Fans
1
52
Platte (113C)
Distribution
Unattended
67
34.5
14
1
Fans
4
53
Wagner (114A)
Distribution
Unattended
34.4
12.5
10
1
Fans
4
54
SW Wagner (114D)
Distribution
Unattended
34.4
12.5
10
1
Fans
4
55
SW Freeman (116F)
Distribution
Unattended
34.4
25
12.47
12
1
Fans
4
56
Cham. Missouri View (119D)
Distribution
Unattended
67
12.5
10
1
Fans
4
57
Aberdeen 4th Street (181A)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
58
Aberdeen 8th Avenue (181E)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
59
Aberdeen Cemetary (181F)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
60
Aberdeen Fairgrounds (181G)
Distribution
Unattended
34.5
12.5
14
4
61
Aberdeen Country Club (181H)
Distribution
Unattended
34.4
12.47
14
1
Fans
4
62
Aberdeen(NW CC (181H)
Distribution
Unattended
34.4
12.5
10
1
63
Aberdeen Industrial Park (181I)
Distribution
Unattended
34.4
12.5
24
1
Fans
13
64
Aberdeen SE (181J)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
65
Aberdeen SE (181J)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
66
Aberdeen NE Gas Plant (181K)
Distribution
Unattended
34.4
12.5
10
1
67
Aberdeen NE Gas Plant (181K)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
68
Aberdeen Ethanol (181L)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
69
Henry (106F)
Distribution
Unattended
69
24.9
14
1
Fans
3
70
Huron SW (184B)
Distribution
Unattended
67
12.5
10
1
71
Huron Frank Avenue (184C)
Distribution
Unattended
67
12.5
12
1
72
Huron City (184D)
Distribution
Unattended
69
12.5
20
1
Fans
8
73
Huron City (184D)
Distribution
Unattended
69
12.5
20
1
Fans
8
74
Mitchell Lake Mitchell (186B)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
75
Mitchell Bridle Acres (186C)
Distribution
Unattended
34.4
12.5
20
1
Fans
8
76
Mitchell Jr. High (186D)
Distribution
Unattended
34.4
12.5
6
1
Fans
1
77
Mitchell Jr. High (186D)
Distribution
Unattended
34.4
12.5
5
1
Fans
5
78
Mitchell Park (186E)
Distribution
Unattended
34.4
12.5
25
1
Fans
15
79
Mitchell Park (186E)
Distribution
Unattended
34.4
12.5
25
1
Fans
15
80
Ohlman Substation (186F)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
81
Mitchell S. Edgerton (186H)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
82
Mitchell S. Kimball (186I)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
83
Yankton NW (189A)
Distribution
Unattended
34.4
12.5
20
1
Fans
8
84
Yankton Warehouse (189B)
Distribution
Unattended
34.4
12.5
14
1
Fans
85
Yankton Sacred Heart (189C)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
86
Yankton SE (189D)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
87
Yankton City (189E)
Distribution
Unattended
34.4
12.5
14
1
Fans
4
88
49 Others Under 10,000 KVA
Distribution
Unattended
140.226
92
0
89
Total
5,919
2,916
40
2,643
190
3
713


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
TRANSACTIONS WITH ASSOCIATED (AFFILIATED) COMPANIES
  1. Report below the information called for concerning all non-power goods or services received from or provided to associated (affiliated) companies.
  2. The reporting threshold for reporting purposes is $250,000. The threshold applies to the annual amount billed to the respondent or billed to an associated/affiliated company for non-power goods and services. The good or service must be specific in nature. Respondents should not attempt to include or aggregate amounts in a nonspecific category such as "general".
  3. Where amounts billed to or received from the associated (affiliated) company are based on an allocation process, explain in a footnote.
Line No.
Description of the Good or Service
(a)
Name of Associated/Affiliated Company
(b)
Account(s) Charged or Credited
(c)
Amount Charged or Credited
(d)
1
Non-power Goods or Services Provided by Affiliated
2
Labor and Benefits
NorthWestern Corporation
39,301,336
3
Board of Director Fees
NorthWestern Energy Group, Inc.
286,763
19
20
Non-power Goods or Services Provided for Affiliated
21
Administration Fee
NorthWestern Energy Group, Inc.
10,200
42


Name of Respondent:

NorthWestern Energy Public Service Corporation
This report is:

(1)
An Original

(2)
A Resubmission
Date of Report:

12/31/2024
Year/Period of Report

End of:
2024
/
Q4
FOOTNOTE DATA

(a) Concept: AccountsChargedOrCreditedTransactionsWithAssociatedAffiliatedCompanies

Labor and Benefits are charged to FERC account based on time card coding.