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 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

Kitchen Ventilation - Advanced Controls $1,000.00 Kitchen Hood Install Demand Control Ventilation System., Ventilation - Parking Garages, Demand Controlled $150.00 1,000 Square Feet Install Variable Speed Drive (VFD)., Ventilation - Demand Controlled $40.00 1,000 Square Feet Install Variable Speed Drive (VFD)., Efficiency Opportunities Date Installed Cost Quantity Manufacturer/Model # Rebate To t a l ( O ffice Use) Commercial Air Curtains Optimized Lab Hood Design Kitchen Ventilation - Advanced Controls Dishwasher Clothes Dryer Ventilation - Parking Garages, Demand Controlled Engine Block Heater Controls Ventilation - Variable Speed Control Chiller - Variable flow Chilled Water Pump - Variable Speed Drive on chilled water pump Ventilation - High Efficiency Motors Wifi Thermostat Ventilation - Demand Controlled Pre-Rinse Spray Valve Page 4 of 5 FOR OFFICE USE ONLY., This proof of purchase must show: (1) the date of purchase and itemized price paid, (2) the size, type, make, model or part number for the products, and (3) a description of any installation or other labor charges.

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.

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.

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 TotalCharges Affiliate NameProducts & ServicesMethod to Determine Priceto UtilityAffil., Rev.to MT Utility 1 2 Nonutility Affiliates 3 4$ — $ — 6 7 8 9 Utility Affiliates 10NorthWestern CorporationAdministration FeeNegotiated Contract Rate$ 511,733 $ 511,733 11NorthWestern CorporationLabor CostActual Expense 1,293,304 1,293,304 12 13$ 1,805,037 $ 1,805,037 15$ 1,805,037 $ 1,805,037 Schedule 6 AFFILIATE TRANSACTIONS - PRODUCTS & SERVICES PROVIDED TO UTILITY Total Nonutility Affiliates Total Utility Affiliates TOTAL AFFILIATE TRANSACTIONS Sch. 7 Charges% of TotalRevenues Affiliate NameProducts & ServicesMethod to Determine Priceto AffiliateAffil., Accounts Receivable (3,223) 3,157 (202.09)% 30 143 Other Accounts Receivable 170,406 265,200 (35.74)% 31 144 Accumulated Provision for Uncollectible Accounts — — - 32 145 Notes Receivable-Associated Companies — — - 33 146 Accounts Receivable-Associated Companies 496,446 326,954 51.84 % 34 151 Fuel Stock — — - 35 154 Plant Materials and Operating Supplies 708,125 713,949 (0.82)% 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 2,376,117 1,627,349 46.01 % 48 49 181 Unamortized Debt Expense — — - 50 182 Regulatory Assets 110,255 — 1 51 183 Preliminary Survey and Investigation Charges

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.

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.

FERC FINANCIAL REPORT FERC FORM No. 1: Annual Report of Major Electric Utilities, Licensees and Others and Supplemental Form 3-Q: Quarterly Financial Report | Exact Legal Name of Respondent (Company) NorthWestern Corporation

NorthWestern Energy 2022 first 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.

Larger users with loads greater than 15 kilowatts (kW) require a demand meter and incur an additional demand charge., The demand charge is measured through a demand meter which registers the highest rate of electrical fow (current) for specifed time periods, usually 15 or 30 minute intervalsduring each billing period, independent of the kWh energy usage., Making decisions to use your pump based on the meter-reading schedule provided can help you better control your demand charges., Demand charges may be prorated, if used less than 25 days, on the frst and last billing periods., Prorating allows you to pay a partial demand charge that better matches the time of energy use.

SOUTH DAKOTA GAS RATE SCHEDULE | Rate No. 81 - Residential Gas Service Gas Commodity Charge | Rate No. 82 - General Gas Service Gas Commodity Charge

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.

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.

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.

NORTHWESTERN PUBLIC SERVICE GAS RATES TARIFF SUMMARY NEBRASKA

Our electric supply from owned and long-term contracted resources is not adequate to meet our peak- demand needs., Because of this, the volatility of market prices for energy on peak-demand days, even if only for a few days in duration, exposes us to potentially significant market purchases that could negatively impact our results of operations and cash flows., Our owned and long-term contracted resources are inadequate to supply the necessary capacity we require to meet our peak-demand loads, which exposes us to large quantities of market purchases at typically high and volatile energy prices., We remain concerned regarding an overall lack of capacity in the West and our owned and long-term contracted capacity deficit to meet peak-demand loads., Income tax expense for the three months ended March 31, 2023 includes a one- time $3.2 million charge for the reduction of previously claimed alternative minimum tax credits.

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.

 Understanding Yo u r N o r t hWestern Electric Meter C o n v e n t i o n a l M e t e r i n g C u s t o m e r s Max Kilowatts Delivered 04 = Max Kilowatts Delivered The current max demand is displayed in kilowatts., Demand charges are for customers with a demand rate type., This screen is displayed whether they are a demand customer or not.

NorthWestern Energy 2022 second quarter FERC form