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Very cold winters increase demand for natural gas and to a lesser extent, electricity, while warmer than normal summers increase demand for electricity, especially among our residential and commercial customers., 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.

Payments received after the billing date are not included. 8 A summary of current charges associated with your service, not including taxes., Demand is measured in kilowatts (kW)., High demand is typically associated with equipment start-up., By spreading equipment start-ups over a more extended period, you may be able to lower demand and reduce your demand charges. 23 The identifcation number of the meter located at this service. 24 The rate number and description of your rate for billing purposes. 25 A summary of your monthly usage multiplied by the rates associated with the delivery of energy with the exception of taxes, as listed on the left hand column of the page., Current Rates Effective 09/01/2020 200@ 0.9708078 81-Residential Natural Gas ELECTRIC SERVICES English: 833-970-2262 Spanish: 833-970-2263 57.67 $ 200@ Energy Charge Elec Fuel Purchase Power 11.22 $ 74.89 $ GAS SERVICES Read Dates Days 9999999@ Customer Charge Meter Readings Read Code Meter Volume Conversion Pressure Average BTU Factor Billed Therms Current 1.92 $ 11.01 $ 3523.00 Actual Meter Number: 2012354 11.01 $ 8.00 $ When you provide a check as a payment, you authorize us to either use the information from your check to make a one-time electronic funds transfer from your account or to process the payment as a check transaction. 1.33 $ Manufactured Gas Plant Refund (0.24) $ TAXES CITY SALES TAX - ABERDEEN 1.89 $ Gas Residential 30@ 9999999@ Manufactured Gas Plant Purchase Gas Commodity NATURAL GAS SERVICES Refund 6.15 $ 4.26 $ Demand Usage 6.00 $ Energy Charge Read Dates Days kWh Meter Readings Demand Read Current Customer Charge

CHARGE SIZE PER KWH CLAUSE CLAUSE W/O FUEL Adjustment FUEL W/O Cust Chg 10, 10YS $7.00 FIRST 200 $0.11186 0.00824 0.00292 $0.12302 0.01792 $0.14094 NEXT 600 $0.11004 0.00824 0.00292 $0.12120 0.00000 0.01792 $0.13912 NEXT 200 $0.09913 0.00824 0.00292 $0.11029 0.00000 0.01792 $0.12821 NEXT 200 $0.07909 0.00824 0.00292 $0.09025 0.00000 0.01792 $0.10817 OVER 1200 $0.03565 0.00824 0.00292 $0.04681 0.00000 0.01792 $0.06473 11, 11YS $7.00 FIRST 200 $0.11186 0.00824 0.00292 $0.12302 0.00000 0.01792 $0.14094 NEXT 600 $0.11004 0.00824 0.00292 $0.12120 0.00000 0.01792 $0.13912 NEXT 200 $0.09913 0.00824 0.00292 $0.11029 0.00000 0.01792 $0.12821 NEXT 200 $0.02955 0.00824 0.00292 $0.04071 0.00000 0.01792 $0.05863 OVER 1200 $0.02955 0.00824 0.00292 $0.04071 0.00000 0.01792 $0.05863 14, 14YS $4.00 ALL KWH $0.03610 0.00824 0.00292 $0.04726 0.00000 0.01792 $0.06518 15, 15YS $4.00 ALL KWH $0.03050 0.00824 0.00292 $0.04166 0.00000 0.01792 $0.05958 16O $55.00 ALL KWH $0.02948 0.00896 0.00317, 0.00317 $0.04161 0.00000 0.01792 $0.05953 16P $0.00 ALL KWH $0.15496 0.00896 0.00317 $0.16709 0.00000 0.01792 $0.18501 16S $0.00 ALL KWH $0.06684 0.00896 0.00317 $0.07897 0.00000 0.01792 $0.09689 17, 17W $0.00 ALL KWH $0.05706 0.00896 0.00317 $0.06919 0.00000 0.01792 $0.08711 21, 21YS $12.00 FIRST 200 $0.13925 0.00896 0.00317 $0.15138 0.00000 0.01792 $0.16930 NEXT 800 $0.12277 0.00896 0.00317 $0.13490 0.00000 0.01792 $0.15282 OVER 1000 $0.09823 0.00896 0.00317 $0.11036 0.00000 0.01792 $0.12828 23, 23YS $8.00 ALL KWH $0.05900 0.00896 0.00317 $0.07113 0.00000 0.01792 $0.08905 24, 24YS $8.00 ALL KWH $0.03288 0.00896 0.00317 $0.04501 0.00000 0.01792 $0.06293 25, 25YS $17.00 FIRST 100 X DEM $0.12934 0.00896 0.00317 $0.14147 0.00000 0.01792 $0.15939 NEXT 100 X DEM $0.03670 0.00896 0.00317 $0.04883 0.00000 0.01792 $0.06675 NEXT 100 X DEM $0.01931 0.00896 0.00317 $0.03144 0.00000 0.01792 $0.04936 OVER 300 X DEM $0.01353 0.00896 0.00317 $0.02566 0.00000 0.01792 $0.04358 33, 33YS DEMAND, ALL KW $13.20000 1.94000 0.69000 $15.83000 $15.83000 ENERGY FIRST 100 X DEM $0.07514 0.00000 0.00000 $0.07514 0.00000 0.01792 $0.09306 NEXT 300 X DEM $0.05168 0.00000 0.00000 $0.05168 0.00000 0.01792 $0.06960 NEXT 100 X DEM $0.03053 0.00000 0.00000 $0.03053 0.00000 0.01792 $0.04845 OVER 500 X DEM $0.01642 0.00000 0.00000 $0.01642 0.00000 0.01792 $0.03434 34, 34L1%, 34L2% DEMAND FIRST 100 KW $13.20000 1.94000 0.69000 $15.83000 $15.83000 34L3%, 34YS NEXT 400 KW $11.69000 1.94000 0.69000 $14.32000 $14.32000 OVER 500 KW $10.19000 1.94000 0.69000 $12.82000 $12.82000 ENERGY FIRST 100 X DEM $0.05865 0.00000 0.00000 $0.05865 0.00000 0.01792 $0.07657 NEXT 300 X DEM $0.02804 0.00000 0.00000 $0.02804 0.00000 0.01792 $0.04596 NEXT 100 X DEM $0.01904 0.00000 0.00000 $0.01904 0.00000 0.01792 $0.03696 OVER 500 X DEM $0.01005 0.00000 0.00000 $0.01005 0.00000 0.01792 $0.02797 41, 41YS $17.00 ALL KWH $0.08967 0.00751 0.00268 $0.09986 0.00000 0.01792 $0.11778 70SO $35.00 ALL KWH $0.01236 0.00630, 0.00224 $0.02090 0.00000 0.01792 $0.03882 70MO $35.00 ALL KWH $0.01236 0.00630 0.00224 $0.02090 0.00000 0.01792 $0.03882 70MP, 70SP $0.00 ALL KWH $0.18242 0.00630 0.00224 $0.19096 0.00000 0.01792 $0.20888 All Rates listed above - Power Factor Charge on tab "Supplmnt Elec 3" $15.83000 Entries for "Billing Control Files", "Rate Adjustment Type Master" EFPPA Elec Fuel Purchase Power $0.01792 MIN34 Minimum Calc., KWH Charge 34 $0.076570 YNDIS YST WAPA Discount -$0.011800 Minimum Demand Charge MNDMD Minimum Demand Charge $15.83000 PWFCT Power Factor Charge $15.83000 Horse Power $5.640

Environmental Protection Agency (EPA) - A Federal agency charged with protecting the environment., The demand for natural gas largely depends upon weather conditions., Thus, the rates we are allowed to charge may or may not match our costs at any given time., Demand for our Montana transmission capacity fluctuates with regional demand, fuel prices and weather related conditions., This charge is recorded within other income, net on the Consolidated Statements of Income.

NorthWestern Energy 2022 third quarter FERC form

Very cold winters increase demand for natural gas and to a lesser extent, electricity, while warmer than normal summers increase demand for electricity, especially among our residential and commercial customers., 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.

Payments received after the billing date are not included. 8 A summary of current charges associated with your service., Demand is measured in kilowatts (kW)., High demand is typically associated with equipment start-up., By spreading equipment start-ups over a more extended period, you may be able to lower demand and reduce your demand charges. 23 The identifcation number of the meter located at this service. 24 The rate number and description of your rate for billing purposes. 25 A summary of your monthly usage multiplied by the rates associated with the delivery of energy with the exception of taxes, as listed on the left hand column of the page., Electric Tax-Delivery 7.88 $ 1.77 $ NATURALGASSUPPLYRATES 31.24 $ ELECTRICSUPPLYRATES 0.06 $ 2.33 $ Res.Supply Res.ElectricTax-Supply Res.GasTax-Supply 1234567-8 CustomerName: DELIVERY SERVICES ELECTRIC DELIVERY JOHNSMITH AccountNumber: DemandUsage 4.00 $ Delivery Charges 15.68 $ ReadDates Days kWhMeterReadings Demand Read Current Res.

Demand represents the highest usage of energy in any 15-minute period during a monthly billing cycle., Demand is measured in kilowatts (kW)., High demand is typically associated with equipment start-up., By spreading equipment start-ups over a more extended period, you may be able to lower demand and reduce your demand charges. 23 The identifcation number of the meter located at this service. 24 The rate number and description of your rate for billing purposes. 25 A summary of your monthly usage multiplied by the rates associated with the delivery of energy with the exception of taxes, as listed on the left hand column of the page., They demand immediate payment of allegedly overdue bills, often with a prepaid card purchased at a store.

When available, copies of the preliminary prospectus supplement, prospectus supplement and accompanying base prospectus relating to the offering may be obtained free of charge on the Securities and Exchange Commission's website at www.sec.gov (http://www.sec.gov) or from BofA Securities by sending a request to: BofA Securities, NC1-004-03-43; 200 North College Street, 3rd Floor, Charlotte, North Carolina 28255-0001, Attention: Prospectus Department or by email at dg.prospectus_requests@bofa.com or from J.P., Our actual future business and financial NorthWestern Corporation Announces Pricing of Public Offering of Common Stock November 17, 2021 Page 3 performance may differ materially and adversely from those expressed in any forward-looking statements as a result of various factors and uncertainties, including, but not limited to:  adverse determinations by regulators, as well as potential adverse federal, state, or local legislation or regulation, including costs of compliance with existing and future environmental requirements, could have a material effect on our liquidity, results of operations and financial condition;  the impact of extraordinary external events, such as the COVID-19 pandemic, on our liquidity, results of operations and financial condition;  changes in availability of trade credit, creditworthiness of counterparties, usage, commodity prices, fuel supply costs or availability due to higher demand, shortages, weather conditions, transportation problems or

Learn what to expect on your monthly statement with net metering.

For complete documentation of the model, see The Distributed Generation Market Demand Model (dGen): Documentation (Sigrin et al. 2016)., The BPA Exchange Credit and Universal System Benefits Charge were assumed to remain constant through 2050., The CTC-QF charges remained constant through June 2029, after which they were assumed to expire., Power Systems Balancing with High Penetration Renewables: The Potential of Demand Response in Hawaii ., The Distributed Generation Market Demand Model (dGen): Documentation .

The Company shall have the right, to fle for, a n d s e e k a p p roval by the Nebraska Public Service Commission of, changes in rates, charges or other tariff provisions applicable to service hereunder and to place such changes in effect in accordance with applicable law; and this Agreement shall be deemed to have been amended to include such changes and any other changes which become effective by operation of law or by order of any governmental body with jurisdiction., C u s t o m e r N a m e : A c c o u n t N u m b e r : C u s t o m e r A d d ress - Gas Delivery Point: Customer Email Address - Notices: Customer Address - Invoices: Customer Contact: Title: Phone: Fax: Receipt Point (NWE TBS): Meter Number(s): Daily Contract Demand: Therms/Day IN WITNESS THEREOF , t h e P a r t i e s h e reto have executed this Service Request Form as of the day and year set forth below.

NorthWestern Energy 2022 first quarter FERC form

 NorthWestern Energy Schedule O‐12 Electric Utility ‐ State of South Dakota Page 1 of 1 Pro Forma Year Ending December 31, 2012 Derivation of Increased Rates and Proof of Revenue Billing Billing Line Description Units Rate Revenue Units Rate Revenue $ % 1 Point to Point Distr Only Service Rate 38 2 Summer Rate 3 Demand Charge 26,657 $3.34 $89,035 26,657 $4.18 $111,427 $22,392 25.15% 4 Sub‐total Summer Rate 5 Booked to Billed Revenue Ratio 6 Booked Base Rate Revenue 7 8 Off‐Peak Rate 9 Demand Charge 41,704 $3.34 $139,290 41,704 $4.18 $174,321 $35,030 25.15% 10 Sub‐total Off‐Peak Rate 11 Booked to Billed Revenue Ratio 12 Booked Base Rate Revenue 13 14 Total Point to Point Distr Only Rate 38 68,361 $228,326 68,361 $285,748 $57,422 25.15% ‐‐‐‐‐‐‐‐‐‐ Present Rates ‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ Proposed Rates ‐‐‐‐‐‐‐‐‐‐ Revenue Change

As a result of the project discontinuance, we recorded a $1.2 million pre-tax charge in the three months ended September 30, 2021, for the write-off of preliminary construction costs., Very cold winters increase demand for natural gas and to a lesser extent, electricity, while warmer than normal summers increase demand for electricity, especially among our residential and commercial customers., As a result of the project discontinuance, we recorded a $1.2 million pre-tax charge for the write-off of preliminary construction costs., Thus, the rates we are allowed to charge may or may not match our costs at any given time., Demand for our Montana transmission capacity fluctuates with regional demand, fuel prices and weather related conditions.

Residential Customers Monthly Usage (kWh) Monthly Electric Bill under Prior Rates Monthly Electric Bill under New Rates Amount of Increase Percentage Increase 400 $58.62 $66.40 $7.78 13.3% 500 $71.70 $81.16 $9.46 13.2% 600 $84.78 $95.92 $11.14 13.1% 750 $104.39 $118.06 $13.67 13.1% 1000 $135.24 $152.78 $17.54 13.0% 2000 $211.42 $234.68 $23.26 11.0% South Dakota Residential Rate Comparison Prior Rate New Rate Customer Charge $6.00 $7.00 First 200 kWh $0.09476 $0.11186 Next 600 kWh $0.09322 $0.11186 Next 200 kWh $0.08397 $0.09913 Next 200 kWh $0.06701 $0.07909 Over 1,200 kWh $0.03153 $0.03565 Ad valorem taxes $0.00349 $0.00349 Delivered Cost of Energy $0.00939 $0.00939 Delivered Cost of Fuel $0.02468 $0.02468 Commercial Customers Monthly Usage (kWh) Monthly Electric Bill under Prior Rates Monthly Electric Bill under New Rates Amount of Increase Percentage Increase 400 $71.08 $79.87 $8.79 12.4% 1,000 $158.40 $176.74 $18.34 11.6% *5,000 $576.84 $639.82 $62.98 10.9% *10,000 $1,153.70, These investments include: Bob Glanzer Generating Station The 58-megawatt Bob Glanzer Generating Station in Huron was commissioned in May 2022, providing on-demand resources to support the variability of wind and solar projects coming onto NorthWestern Energy’s system and to help serve our South Dakota customers affordably and reliably during extended periods of peak energy demand.

This year, prices are 73% higher than the 10-year average, due to lower supply and increased demand., Natural gas delivery charges, which cover the cost of the pipes and other infrastructure required to deliver natural gas to homes and businesses, are unchanged. 2.

Durkin. 4  I explain NorthWestern’s proposed amortization related to the 5 recommendation to record Demand Side Management (“DSM”) costs 6 as a component of rate base. 7  I explain NorthWestern’s proposal for the future acquisition of natural 8 gas production assets and the recent acquisition of the Sleepy Hollow 9 natural gas distribution system. 10  Finally, I attest to the accuracy of the accounting data NorthWestern 11 submits with this filing. 12 13 Q., Historically, NorthWestern recorded pension and benefits expense in 14 FERC account 926 “Employee pensions and benefits”, and at the end of 15 each month, transferred the portion of pension and benefits expenses, 16 which were applicable to utility operations, non-utility operations, and 17 construction accounts, through a payroll loading process. 18 19 However, the Uniform System of Account Instructions for account 926 20 states, “There shall be credited to this account the portion of pensions and 21 benefits expenses which is applicable to nonutility operations or which is 22 charged to construction unless such amounts are distributed directly to the 23 JBB-13 accounts involved and are not included herein in the first instance.”, Durkin 15 is responsible for the non-rate base-related items in Statement G, and I 16 am responsible for the rate base-related items, such as intangibles and 17 acquisition adjustments, in Statement G and Statement I. 18 19 Electric Demand Side Management (“DSM”) Rate Base Proposal 20 Q., The Commission’s rules (ARM 38.5.8218) allow NorthWestern to fully 1 recover prudently incurred costs related to procuring demand-side 2 resources., It is consistent with the concept of developing 21 demand-side resources to complement supply-side resources and 22 JBB-25 balances the interests of shareholders, customers, and other stakeholders 1 by not creating further disincentive to NorthWestern’s investments in DSM. 2 3 Q.

Environmental Protection Agency (EPA) - A Federal agency charged with protecting the environment., Our total control area peak demand was approximately 1,799 MWs on January 14, 2020., The demand for natural gas largely depends upon weather conditions., Thus, the rates we are allowed to charge may or may not match our costs at any given time., Very cold winters increase demand for natural gas and to a lesser extent, electricity, while warmer than normal summers increase demand for electricity, especially among our residential and commercial customers.

Our Montana system meets record energy demand during extreme weather Energy demand was record high during the Arctic blast that blanketed Montana in mid-January., T h e Truth: NorthWestern Energy customers who install home solar are still charged a monthly service fee.