NorthWestern Energy : 2025 HPC Annual Report

About this update from Northwestern Energy Group, Inc.

YEAR ENDING 2025 ANNUAL REPORT OF Havre Pipeline Company, LLC Docket 2026.01.001 TO THE PUBLIC SERVICE COMMISSION STATE OF MONTANA 1701 PROSPECT AVENUE P.O. BOX 202601 HELENA, MT 59620-2601 Havre Pipeline Company, LLC Annual Report Table of Contents Description Schedule Identification 1 Board of Directors not applicable 2 Officers 3 Corporate Structure not applicable 4 Corporate Allocations not applicable 5 Affiliate Transactions - To the Utility 6 Affiliate Transactions - By the Utility not applicable 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 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 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 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 Side Mgmt. Programs not applicable 34 Montana Consumption and Revenues 35 Natural Gas Universal System Benefits Programs not applicable 36a Montana Conservation and Demand Side Mgmt. Programs not applicable 36b Sch. 1 IDENTIFICATION 1 2 3 4 5 6 9 10 11 12 13 14 15 16 17 18 Legal Name of Respondent: Havre Pipeline Company, LLC Name Under Which Respondent Does Business: Havre Pipeline Company, LLC Date Utility Service First Offered in Montana: November 1, 1995 Person Responsible for Report: Jeff B. Berzina Telephone Number for Report Inquiries: (406) 497-2759 Address for Correspondence Concerning Report: 11 East Park Street Butte, MT 59701 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: 1a. Name and address of the controlling organization or person: NorthWestern Corporation 3010 West 69th Street Sioux Falls, SD 57108 1b. Means of which control was held: Managing Member 1c. Percent Ownership 96.13 % Schedule 1 Sch. 3 OFFICERS Title Department Supervised Name 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 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 President Vice President Vice President Treasurer Secretary Assistant Secretary Michael Cashell Bleau LaFave Jason McClafferty Crystal Lail Tim Olson Emily Larkin Folsom Reflects active officers as of December 31, 2025. Schedule 3

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