NorthWestern Energy : 2025 NW Corp - Electric Annual Report

About this update from Northwestern Energy Group, Inc.

YEAR ENDING 2025 ANNUAL REPORT OF NorthWestern Energy ELECTRIC UTILITY Docket 2026.0 1.001 TO THE PUBLIC SERVICE COMMISSION STATE OF MONTANA 1701 PROSPECT AVENUE P.O. BOX 202601 HELENA, MT 59620-2601 Electric Annual Report Table of Contents Description Schedule Instructions Identification 1 Board of Directors 2 Officers 3 Corporate Structure 4 Corporate Allocations 5 Affiliate Transactions - To the Utility 6 Affiliate Transactions - By the Utility 7 Montana Utility Income Statement 8 Montana Revenues 9 Montana Operation and Maintenance Expenses 10 Montana Taxes Other Than Income 11 Payments for Services 12 Political Action Committees/Political Contributions 13 Pension Costs 14 Other Post Employment Benefits 15 Top Ten Montana Compensated Employees 16 Top Five Corporate Compensated Employees 17 Balance Sheet 18 vii continued on next page Description 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 24 Preferred Stock 25 Common Stock 26 Montana Earned Rate of Return 27 Montana Composite Statistics 28 Montana Customer Information 29 Montana Employee Counts 30 Montana Construction Budget 31 Peak and Energy 32 Sources and Disposition of Energy 33 Sources of Electric Supply 34 MT Conservation and Demand Side Management Programs 35 Electrical Universal Systems Benefits Programs 35a MT Conservation and Demand Side Management Programs 35b Montana Consumption and Revenues 36 viii Sch. 1 IDENTIFICATION 1 2 Legal Name of Respondent: NorthWestern Corporation 3 4 Name Under Which Respondent Does Business: NorthWestern Energy 5 6 Date Utility Service First Offered in Montana: Electricity - Dec 12, 1912 7 Natural Gas - Jan 01, 1933 8 Propane - Oct 13, 1995 9 10 Person Responsible for Report: Jeff B. Berzina 11 12 Telephone Number for Report Inquiries: (406) 497-2759 13 14 Address for Correspondence Concerning Report: 11 East Park Street 15 Butte, MT 59701 16 17 18 If direct control over respondent is held by another entity, provide below the name, address, means by which control is held and percent ownership of controlling entity: Respondent is a wholly-owned, direct subsidiary of NorthWestern Energy Group, Inc. At December 31, 2025, NorthWestern Energy Group, Inc. owned 100% of the common stock of respondent. Schedule 1 Sch. 2 BOARD OF DIRECTORS Director's Name & Address (City, State) Remuneration 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 See NorthWestern Corporation's Annual Report FERC Form No. 1 page 105 for our Corporate Board of Directors. Schedule 2

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