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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.

Each of the billing determinates (test period usage, demand usage, and 4 number of customers) for each customer class were multiplied by the 5 current base rate., First, 20 NorthWestern made known and measurable changes to reflect prior 21 period adjustments, one-time charges, or expiration of contracts., Each of the billing determinants (number of customers, demand, and 4 dekatherms) for each customer class were multiplied by the current base 5 rate., First, NorthWestern made known and measurable changes to 23 ADD-58 reflect prior period adjustments, one-time charges, or expiration of 1 contracts., How will rates be adjusted under NorthWestern’s Demand Side 13 Management (“DSM”) Rate Base Proposal?

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.

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., Sch. 6 Charges % of Total Charges Affiliate Name Products & Services Method to Determine Price to Utility Affil., 6,016 391 >300.00% 30 143 Other Accounts Receivable 192,757 240,460 (19.84)% 31 144 Accumulated Provision for Uncollectible Accounts (18,506) 100.00 % 32 145 Notes Receivable-Associated Companies — — - 33 146 Accounts Receivable-Associated Companies 169,296 (128,151) 232.11 % 34 151 Fuel Stock — — - 35 154 Plant Materials and Operating Supplies 714,521 714,748 (0.03)% 36 164 Gas Stored - Current — — - 37 165 Prepayments — — - 38 171 Interest and Dividends Receivable — — - 40 172 Rents Receivable — — - 41 173 Accrued Utility Revenues — — - 42 174 Miscellaneous Current & Accrued Assets — — - 43 175 Derivative Instrument Assets (175) — — - 44 (Less) Long-Term Portion of Derivative Instrument Assets — — - 45 176 LT Portion of Derivative Assets - Hedges — — - 46 (less) LT Portion of Derivative Assets - Hedges — — - 47 1,478,628 1,229,166 20.30 % 48 49 181 Unamortized Debt Expense — — - 50 182 Regulatory Assets — 369,731 (100.00)% 51 183 Preliminary Survey and Investigation Charges

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.

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.

Electric Service Requirements & Guidelines for our Montana Service Area. This document provides detailed information in establishing electric service for new and remodeled structures.

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.

• 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.

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.

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.

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

NorthWestern Energy 2021 third quarter FERC form

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.

Programs not applicable 34 Montana Consumption and Revenues 35 Natural Gas Universal System Benefits Programs not applicable 36a Montana Conservation and Demand Side Mgmt., 5 CORPORATE ALLOCATIONS Sch. 6 AFFILIATE TRANSACTIONS - PRODUCTS & SERVICES PROVIDED TO UTILITY Charges % of Total Charges Affiliate Name Products & Services Method to Determine Price to Utility Affil., 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., This charge is recorded within operating expense, net on the Statements of Income.

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.