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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.

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.

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.

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 would result in a charge to earnings, net of applicable income taxes, which could be material.

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 (I), provide revenues from energy charges related to the amount of energy transferred., 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.

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.

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• Lower 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.

• Energy charges can be thought of as costs for the use of the highways (pipes) that deliver the energy from the generation source to the user., These charges are subject to regulation by State Utility Commissions and where appropriate, the Federal Regulatory Commission, We never demand prepaid cards, If NorthWestern Energy needs to upgrade or replace a meter, the cost of the new meter is not charged to the individual customer, • Any over payments will be applied to your NorthWestern Energy account and used to cover future charges.

Pleasedescribetheproposedchangestothemonthly customer charges. 6 A., Overall,theproposedrevenueincreasesforcommercialcustomersareconsistentwith 21 themoderatedrevenuelevelsdeterminedintheadjustedCCOS.Consistentwiththe 22 residentialclass,theportionoftherevenuerequirementnotcollectedviatheproposed 23 JJD-8 customer charge increases is recovered in the proposed distribution delivery and 1 demand charges., The per-kW demand charges will increase as follows: 2 $11.05to$14.13forRate33andthefirst100kWofRate34. 3 $9.79to$12.52forthenext400kWofRate34. 4 $8.53to$10.91foranymonthlykWover500ofRate34. 5 6 Customerimpactsvarygreatlyduetothewiderangeofusageinthecommercialclass. 7 ARate21customerusing1,000kWhwillseeamonthlyincreaseof$25.80.ARate 8 34customerwithapeakdemandof3,000kWandusing1,080,000kWhwillseea 9 monthlyincreaseof$18,438. 10 11 Q., Whatisthebasisofcostsforthestandby charge?, Ifthatprovisionisremoved,how will service charges be applied?

I became the Vice President in 5 charge of Customer Care in 2002 and assumed responsibility for 6 Corporate Communications and Human Resources in 2005 and 2009, 7 respectively. 8 9 Prior to joining NorthWestern, I worked for an electric cooperative where I 10 held positions in electric and security dispatch, electric use consulting, and 11 marketing and market research. 12 13 I am active in regional and national industry associations including serving 14 as the past board chair for MEA Energy Association., Our network of community relations professionals work at 2 the local level to identify and support programs and projects that enhance 3 the communities we serve, communities where approximately 1,250 4 Montana employees work and live. 5 6 NorthWestern’s energy efficiency programs, such as the E+ Home Energy 7 Check energy audit program and the Efficiency Plus (E+) programs for 8 business customers, and Demand Side Management are Customer Care 9 functions., For example, NorthWestern administers 18 customer funds collected through the Universal System Benefits Charge 19 (“USBC”), and we have developed an array of programs, using those 20 funds, to offer something for everyone.

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 (I), provide revenues from energy charges related to the amount of energy transferred., 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.

We never demand prepaid cards, • A n y over payments will be applied to your NorthWestern Energy account and used to cover future charges.

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.

Rates Monthly Charges: C u s t o m e r C h a r g e p e r M e t e r : $100.00 Non-Gas Commodity Charge: A l l u s e , p e r t h e r m $ 0 .09212 CityApproved Economic Development Surcharge $ 0 .00380 Minimum Monthly Bill - Amount for therms of demand billed and the customer charge Adjustment C l a u s e s : a ., Minimum Charge CustomerCharge *Innoevent shall the demand charge (if applicable), plus the total of the customer charge and the revenue from the transportation rate, be less than the incremental cost of serving each customer in this class., Rates Monthly Charges: C u s t o m e r C h a r g e per Meter: $ 80.00100.00 Demand Charge: Pertherm daily firm demand 1 s t 5 0 0 t h e r m s / d a y (never less than 50 therms) $0.24590 O v e r 5 0 0 t h e rms/day $ 0 .00000 Non-Gas Commodity Charge: All use, per therm $ 0 .059110.09212 CityApproved Economic Development Surcharge $ 0 .002540.00380 Minimum Monthly Bill - Amount for therms of demand billed and the customer charge Adjustment C l a u s e s : a ., Minimum Charge Customer Charge + Demand Charge(if applicable) *In no event shall the demand charge (if applicable), plus the total of the customer charge and the revenue from the transportation rate, be less than the incremental cost of serving each customer in this class., It is simple 11 supply and demand economics.

Montana Taxes Other Than Income 11 Payments for Services 12 Political Action Committees/Political Contributions not applicable 13 Pension Costs not applicable 14 Other Post Employment Benefits not applicable 15 Top Ten Montana Compensated Employees not applicable 16 Top Five Corporate Compensated Employees not applicable 17 Balance Sheet 18 Havre Pipeline Company, LLC Annual Report Table of Contents Description continued on next page Schedule Montana Plant in Service 19 Montana Depreciation Summary 20 Montana Materials and Supplies 21 Montana Regulatory Capital Structure 22 Statement of Cash Flows 23 Long Term Debt not applicable 24 Preferred Stock not applicable 25 Common Stock not applicable 26 Montana Earned Rate of Return 27 Montana Composite Statistics 28 Montana Customer Information 29 Montana Employee Counts not applicable 30 Montana Construction Budget 31 Transmission, Distribution and Storage Systems 32 Sources of Gas Supply 33 MT Conservation and Demand, Programs not applicable 34 Montana Consumption and Revenues 35 Natural Gas Universal System Benefits Programs not applicable 36a Montana Conservation and Demand Side Mgmt., Schedule 3 Sch. 6 AFFILIATE TRANSACTIONS - PRODUCTS & SERVICES PROVIDED TO UTILITY Charges % of Total Charges Affiliate Name Products & Services Method to Determine Price to Utility Affil., Provision for Uncollectible Accounts - - - 3 2 1 4 5 N o tes Receivable-Associated Companies - - - 3 3 1 4 6 A ccounts Receivable-Associated Companies 206,785 90,926 127.42% 34 151 Fuel Stock - - - 3 5 1 5 4 P lant Materials and Operating Supplies 716,916 733,799 -2.30% 36 164 Gas Stored - Current - - - 3 7 1 6 5 P repayments - - - 3 8 1 7 1 I n terest and Dividends Receivable - - - 4 0 1 7 2 R e n ts Receivable - - - 4 1 1 7 3 A ccrued Utility Revenues - - - 4 2 1 7 4 M iscellaneous Current & Accrued Assets - - - 4 3 1 7 5 D e rivative Instrument Assets (175) - - - 4 4 ( L e ss) Long-Term Portion of Derivative Instrument Assets - - - 4 5 1 7 6 L T Portion of Derivative Assets - Hedges - - - 4 6 ( less) LT Portion of Derivative Assets - Hedges - - - 4 7 T otal Current & Accrued Assets 1,397,424 1,524,079 -8.31% 48 Deferred Debits 49 181 Unamortized Debt Expense - - - 5 0 1 8 2 R e g u latory Assets 369,731 369,731 0.00% 51 183 Preliminary Survey and Investigation Charges

NORTHWESTERN ENERGY PUBLIC SERVICE CORPORATION (A direct, wholly-owned subsidiary of NorthWestern Energy Group, Inc.) | Financial Statements |For the Period Ending December 31, 2024

NorthWestern Energy 2022 fourth quarter FERC form

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.

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.