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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.

CHARGE SIZE PER THERM Devl Charge PGC customer chg 91 $8.00 FIRST 30 $0.25283 $0.00254 0.34954 $0.60491 OVER 30 $0.09513 $0.00254 0.34954 $0.44721 92 $9.00 FIRST 400 $0.13332 $0.00254 0.34954 $0.4854 NEXT 1,600 $0.06343 $0.00254 0.34954 $0.4155 OVER 2,000 $0.03743 $0.00254 0.34954 $0.3895 95IRG $0.00 ALL Therms $0.10574 $0.00254 0.19957 $0.3079 94E $80.00 ALL Therms $0.05911 $0.00254 0.18957 $0.2512 PGD51 Daily Demand R 500 1.054100 99999999 0.808200 95 $70.00 ALL Therms $0.05911 $0.00254 0.19957 $0.2612 ALDA only Rates 91AL $8.00 FIRST 30 $0.25283 0.34954 $0.60237 OVER 30 $0.09513 0.34954 $0.44467 92AL $9.00 FIRST 400 $0.13332 0.34954 $0.4829 NEXT 1,600 $0.06343 0.34954 $0.4130 OVER 2,000 $0.03743 0.34954 $0.3870 95ALI $0.00 ALL Therms $0.10574 0.19957 $0.3053 94ALE $80.00 ALL Therms $0.05911 0.18957 $0.2487 95AL $70.00 ALL Therms $0.05911 0.19957 $0.2587 Average residential price of gas per therm based on 150 therms = $0.53

The Company shall have the right, to fle for, a n d s e e k a p p roval by the South Dakota Public Utilities Commis- sion 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.

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., Receivable 240,460 288,846 -16.75% 31 144 Accumulated Provision for Uncollectible Accounts (18,506) - - 32 145 Notes Receivable-Associated Companies - - - 33 146 Accounts Receivable-Associated Companies (128,151) 206,785 -161.97% 34 151 Fuel Stock - - - 35 154 Plant Materials and Operating Supplies 714,748 716,916 -0.30% 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 Total Current & Accrued Assets 1,229,166 1,397,424 -12.04% 48 Deferred Debits 49 181 Unamortized Debt Expense - - - 50 182 Regulatory Assets 369,731 369,731 0.00% 51 183 Preliminary Survey and Investigation Charges

This evaluation focuses on supply side alternatives, with NorthWestern considering demand side alternatives separately., Electrons flow in the reverse direction during a charge cycle when energy is drawn from the grid., The liquid electrolyte used for charge- discharge reactions is stored externally and pumped through the cell., The increasing demand for battery storage in consumer electronics and the transportation sector as well as the emerging demand from the energy sector are propelling advances in the technology and manufacturing capacity for Li-ion., The variable O&M costs do not include electric purchases made to charge the batteries.

 ______________________________________________________________________________ ________________________________________________________________________ NEBRASKA PUBLIC SERVICE COMMISSION NATURAL GAS RATE SCHEDULE for NORTHWESTERN CORPORATION d/b/a NORTHWESTERN ENERGY Section No. 3 _____ 47thRevised SheetNo.7.1 Canceling 46th Revised Sheet No. 7.1 Purchased Gas Cost Adjustment Per Therm Per Month Rate No. 91 – Residential Gas Service – Firm Gas C ommodity C h a r g e $ 0 . 34954 Rate No. 92 – General Gas Service – Firm Gas C ommodity C h a r g e $ 0 . 34954 Rate No. 93 – Irrigation – Interruptible Sales Service Gas C ommodity C h a r g e $ 0 . 19957 Rate No. 94 – Commercial and Industrial – Firm Sales Service Gas Demand Charge – Standard Service (all contract therms) $0.80820 Gas C ommodity C h a r g e $ 0 . 18957 Rate No. 95 – Commercial & Industrial – Interruptible Sales Service Gas Commodity Charge $0.19957 Rate No. 97 – Commercial and Industrial – Firm Sales

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., 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.

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.

NorthWestern Energy 2022 second quarter FERC form

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.

NorthWestern manages the transmission system as a Balancing 7 Authority Area (“BAA”) operator, with responsibility for ensuring that 8 system supply and demand are in constant balance., When demand and 12 supply are not in balance, equipment damages, cascading outages, or 13 blackouts can result., Since NorthWestern began to interconnect and integrate variable energy 20 resources, such as wind and solar, to the transmission system, we have 21 had to add other resources to our system in order to provide the capacity 22 needed for balancing the supply with demand on the system., We have mitigated staff-related issues, in particular 11 within our 24-hour transmission control room operations, by utilizing our 12 back-up control centers to separate crews to limit potential exposures. 13 14 We have and are currently experiencing long materials and equipment 15 lead times, rising costs, and materials availability issues associated with 16 constraints in the supply chain and increased demand within the market. 17 The supply chain impacts create increased cost and schedule risks for 18 capital projects and ongoing maintenance activities., For 11 example, an emerging reliability or compliance issue may receive a 12 greater relative ranking in the overall annual budgeting process. 13 14 In addition, our Asset Management group is charged with developing and 15 maintaining strategies for assessing asset life and planning for appropriate 16 replacement of facilities.

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

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

& Services Method to Determine Price 2 Nonutility Subsidiaries Charges to Utili % of Total 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, 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., 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.

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?

The Colstrip resource has characteristics that provide many positive benefits to NorthWestern’s supply portfolio and the customers we serve:  Baseload power – one of only two NorthWestern baseload assets;  Load-serving capacity and a reliable source of capacity at times of peak demand;  Reliability and price stability;  Component of portfolio optimization plan;  Complements baseload hydro: reduced production during high hydro and low load conditions; and  Stable fuel pricing; low price volatility., NorthWestern typically operates two units at a time, reserving the third unit to be utilized during maintenance outages or during periods of elevated regulation demand., Basin Creek has been used historically for serving load and peak demand, and to provide non-spinning reserves., Distributed Energy Resources Customer-driven Distributed Energy Resources (“DER”) development is subsidized by funding mechanisms such as the Universal System Benefits Charge and through the net metering tariffs that allow behind-the-meter generation. 2 Projecting additional DER by project resource growth based on historical values is difficult because it relies, at least in part, on customer behavior and investment.

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.

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The energy landscape is changing and we are committed to meeting the changing demands of our customers through continued investment to enhance reliability, security and safety, grid modernization, and integra- tion of even more renewables and energy storage, while meeting our growing demand for capacity., The following factors, in addition to those discussed within Risk Factors in our Annual Report on Form 10-K for the year ended December 31, 2022, and elsewhere in this report and in our other flings with the Securities and Exchange Commission, could cause actual results to difer materially from management expectations suggested in such forward-looking statements: • federal, state or local administrative, regulatory, judicial, or legislative proceedings or actions, and any changes in laws, regulations, interpretations, policies and ratemaking determinations; • the efects on demand for our services resulting from business and economic conditions or from technological advanc- es, including advances in customer energy efciency, energy storage, and private generation sources, which generate electricity at the site of consumption and are becoming more cost-competitive; • our ability to align overall spending, both operating and capital, with frameworks established by our regulators, Nonetheless, as our region grows, demand for gas grows, especially during periods of peak need such as severe cold temperatures., More electric cars mean more demand for electricity, and at NorthWestern Energy, we have been working to make sure we’ll be able to meet that demand., In addition, Montana customers fund energy efciency as a least-cost resource in supply rates and through the Universal Sys- tem Benefts Charge (USBC).