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These decreases were partly offset by higher demand to transmit energy across our transmission lines due to market conditions and pricing., Thus, the rates we are allowed to charge may or may not match our costs at any given time., Demand for electricity and natural gas is often greater in the summer and winter months associated with cooling and heating., Such technologies could also result in further declines in commodity prices or demand for delivered energy., Demand for our Montana transmission capacity fluctuates with regional demand, fuel prices and weather related conditions.

They are doing their best to keep up with the vault toilet maintenance and trash clean-up demand at the USFS sites listed in this proposal., The agencies charged with managing the recreation sites are having a difficult time keeping up with this increase use.

Programs not applicable 34 Montana Consumption and Revenues 35 Natural Gas Universal System Benefits Programs not applicable 36a Montana Conservation and Demand Side Mgmt., 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., This would result in a charge to earnings and AOCI, net of applicable income taxes, which could be material., 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., This charge is recorded within operating expenses, net on the Statements of Income.

Demand reported in column (h) must be in megawatts., In column (k), provide revenues from demand charges related to the billing demand reported in column (h)., In column (e) report the demand charges and in column (f) energy charges related to the amount of energy transferred., Report in column (h) the total charge shown on bills rendered to the respondent., 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 MONTANA 2 Vigilante Elec.

Programs not applicable 34 Montana Consumption and Revenues 35 Natural Gas Universal System Benefits Programs not applicable 36a Montana Conservation and Demand Side Mgmt., Charges to MT Utilil' !, 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., All expenditures for maintenance and repairs of utility plant are charged to the appropriate maintenance expense accounts., On August 30, 2016, PNWS sent us a demand letter demanding that we enter into power purchase agreements for 21 solar projects and threatening to sue us for $ 106 million ifwe did not accede to its demand.

We never demand prepaid cards, If there is a charge related to work on equipment, it will typically be included in your monthly bill or paid prior to installation, • Any over payments will be applied to your NorthWestern Energy account and used to cover future charges.

The investments we have made in these 14 BBB-11 resources increase reliability and protect against reliance on the market 1 during peak demand. 2 3 Between January 11 and 16, 2024, Montana experienced a very severe and 4 sustained duration cold weather event., In addition, 15 during extended weather events, we need resources that are available and 16 reliable to help serve customers during extended hours of peak demand. 17 Resources like YCGS provide reliable energy and protection from price 18 volatility in the market for customers. 19 20 We strive for a balanced energy supply portfolio., This goal considers Montana’s unique geography, terrain, weather, 3 and factors in the challenge we face in Montana of not having enough energy 4 available during peak demand times., It is simple supply and 4 demand economics., She also discusses the 5 potential for meaningful rate options for customers enabled by the 6 implementation of AMI, and the need for a standby charge. 7 • Glenda J.

• NorthWestern Energy does not charge customers a fee to upgrade or replace meters., Energy Information Administration reports rising natural gas prices due to a below-average supply and continued demand for natural gas.

“Sustainable procurement really makes us look at a lot of what we buy, a n d h o w w e c a n reduce waste and reduce demand for new materials,” he said., N o r t h Western Energy Montana customers have the right to opt-out of the use of advanced metering devices and may be required to pay a tariff charge, if a tariff is approved by the Montana Public Service Commission., However, a t t h i s t i m e , a n o p t - o u t - t a r i ff charge has not been considered by the Montana PSC.

NorthWestern Energy 2021 third quarter FERC form

We never demand prepaid cards, • A n y o v e r p a y m e n t s w i l l b e a p p l i e d t o y o u r N o r t h Western Energy account and used to cover future charges.

Public Safety Power Shutoff (PSPS) outages involve de-energizing electrical infrastructure in specific areas, during periods of time where the risks of continuing to operate electrical infrastructure are unacceptably high.

Company reports GAAP diluted earnings per share of $0.68 for the quarter, affirms 2021 earnings guidance range, and announces a $0.62 per share quarterly dividend payable December 31, 2021.

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., This would result in a charge to earnings and (AOCI), net of applicable income taxes, which could be material., All expenditures for maintenance and repairs of utility plant are charged to the appropriate maintenance expense accounts., 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., This charge is recorded within operating expense, net on the Statements of Income.

Our Sustainability Report provides transparency into the social, environmental and economic impacts of NorthWestern Energy. We created this voluntary report to offer insights into how we view sustainability.

Payments for Services Political Action Committees/Political Contributions Pension Costs Other PostEmployment Benefits Top Ten Montana Compensated Employees Top Five Corporate Compensated Employees Balance Sheet continued on next page not applicable not applicable not applicable not applicable not applicable not applicable not applicable not applicable not applicable Schedule 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Description Montana Plant in Service Montana Depreciation Summary Montana Materials and Supplies Montana Regulatory Capital Structure Statement of Cash Flows Long Term Debt Preferred Stock Common Stock Montana Earned Rate of Return Montana Composite Statistics Montana Customer Information Montana Employee Counts Montana Construction Budget Transmission, Distribution and Storage Systems Sources of Gas Supply MT Conservation and Demand Side Mgmt., Natural Gas·Universal System Benefits 0Programs Montana Conservation and Demand Side Mgmt., Schedule 3 AFFILIATE TRANSACTIONS - PRODUCTS & SERVICES PROVIDED TO UTILITY Affiliate Name Products & Services Method to Determine Price 2 Nonutility Subsidiaries Charges to Utili % of Total Affil., Charges to MT Utilit 3 , - - - - - - - - - - - - - - - - ~ - - - - - - - - - - ~ - - - - - - - - - - - - - - 1 - - - - - - - 1 - - - -........- - - - - - - 1 4 Total Nonutility Subsidiaries $0 $0 5 Total Nonutility Subsidiaries Revenues $0 6 7 1 - - - - - - - - - - - - - - - - ~ - - - - - - - - - - ~ - - - - - - - - - - - ~ - - - - - ~ - - - - ~ - - - - - - - 1 8 9 Utility Subsidiaries 10 NorthWestern Corporation 11 NorthWestern Corporation Management Services Labor Cost Management Agreement Actual Payroll $500,400 1,061,248 $500,400 1,061,248 12f--_ _ _ _ _ _ _ _ _ _ _ _ _ _ __,__ _ _ _ _ _ _ _ _ _.L..._ _ _ _ _ _ _ _ _ _ _- l - - - - - - - - l - - - - - - l - - - - - - - - - l 13 Total Utility Subsidiaries 14 Total Utility Subsidiaries Revenues 15 TOTAL AFFILIATE TRANSACTIONS $1,561,648 $1,561,648 Schedule6 • MONTANA UTILITY INCOME STATEMENT· HAVRE PIPELINE CO., LLC This Year Last Year Account Number & Title Montana Montana % Chanae 1 2 400 Operating Revenues, nary Survey and Investigation Charges - - - 52 184 Clearing Accounts - - - 53 185 Temporary Facilities - - - 54 186 Mlsce!

As a public utility, Montana law provides the Commission with statutory authority to set the rates and charges as well as service terms., NorthWestern’s proposed allocated cost of service and rate design for both the electric and natural gas utility services, including the proposed changes to street lighting rate design; 4. a waiver of ARM 38.5.106 to allow for recovery of costs beyond 2022 for NorthWestern’s Enhanced Wildfire Mitigation Plan and BT/Cyber Security and the proposed riders for each program; 5. the Reliability Rider; 6. reset the property tax base for both electric and natural gas services; 7. a new baseline of costs and credits for the PCCAM as well as the redesigned PCCAM; 8. a redesigned electric FCRM pilot and applicable new tariff; 9. an increase to monthly service charges for non-residential, non-GS-1 non-demand customers; 10. capitalization of Demand Side Management costs and approval of the related regulatory asset; 11. depreciation rates based on the depreciation study submitted in this docket; 12. approval of the proposed revisions to the natural gas production revenue requirement step-down

Building Design and Solar Radiation For the majority of Montana’s solar heat applications, the demand for heat is usually the greatest during the fall, winter, a n d e a r l y s p r i n g w h e n t h e d a y s a re the shortest, although this is not necessarily true for consumers installing solar domestic hot water systems, where usage patterns are fairly consistent throughout the year., Because of the “automatic” shutdown capabilities when there is no demand, drain back systems are popular and very convenient in applications where the heat load is not consistent., Closed-loop solar systems are the most vulnerable on hot, sunny days with little heat demand., This includes measures for air venting and maintaining the proper charge on the system, as well as controls to prevent unwanted thermosiphoning.

The license allows for baseload and flexible generation including peaking such that when electrical demand is high, the Project would be operated at or near full load; when electrical demand is low, generation would be reduced., The license allows for baseload and flexible generation including peaking such that when electrical demand is high, the Project would be operated at or near full load; when electrical demand is low, generation would be reduced., The license allows for baseload and flexible generation including peaking such that when electrical demand is high, the Project would be operated at or near full load; when electrical demand is low, generation would be reduced., NorthWestern provides important recreation facilities that serve both EJCs, free-of-charge., for wear, tear, and obsolescence of plant, and T = all taxes not counted as operating expenses and not directly charged to customers.

Docket No. 2022.07.078 Transmittal Letter August 8, 2022 Page 3 Cyber Security; • A Reliability Rider for the more timely recovery of critical reliability investments; • A proposal to redesign NorthWestern’s PCCAM to better capture evolving market conditions; • A proposal to redesign NorthWestern’s Fixed Cost Recovery Mechanism (“FCRM”) pilot to effectively implement decoupling; • A proposal to simplify NorthWestern’s lighting tariffs to better reflect the new services provided resulting from the implementation of NorthWestern’s LED Lighting Project; and • An increase to the monthly service charge for non-residential customers, excluding electric Schedule GS-1 Non-Demand.