NorthWestern Energy : 2025 Great Falls Gas - Propane Annual Report

About this update from Northwestern Energy Group, Inc.

YEAR ENDING 2025 ANNUAL REPORT OF NorthWestern Great Falls Gas, LLC (Propane) GAS UTILITY Docket 2026.01.001 TO THE PUBLIC SERVICE COMMISSION STATE OF MONTANA 1701 PROSPECT AVENUE P.O. BOX 202601 HELENA, MT 59620-2601 NorthWestern Great Falls Gas, LLC (Propane) Annual Report Table of Contents Description Schedule Identification 1 Board of Directors not applicable 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 not applicable 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 16 Top Five Corporate Compensated Employees 17 Balance Sheet 18 continued on next page Description Schedule Montana Plant In Service 19 Montana Depreciation Summary 20 Montana Materials and Supplies not applicable 21 Montana Regulatory Capital Structure 22 Statement of Cash Flows 23 Long Term Debt 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 30 Montana Construction Budget 31 Transmission, Distribution and Storage Systems not applicable 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 Legal Name of Respondent: Name Under Which Respondent Does Business: Date Utility Service First Offered in Montana: Great Falls Cascade West Yellowstone Person Responsible for Report: Telephone Number for Report Inquiries: Address for Correspondence Concerning Report: NorthWestern Great Falls Gas, LLC NorthWestern Energy Manufactured Gas: December 8, 1909 Natural Gas: May 2, 1928 Propane: August 1994 Natural Gas: July 2009 Natural Gas: September 1995 Jeff B. Berzina (406) 497-2759 11 East Park Street Butte, MT 59701 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 If direct control over respondent is held by another entity, provide below the name, 25 address, means by which control is held and percent ownership of controlling 26 entity: 27 28 Respondent is a wholly-owned, direct subsidiary of NorthWestern Corporation. 29 30 31 32 33 34 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 Treasurer Secretary Assistant Secretary Brian Bird Crystal Lail Emilie Ng Tim Olson Emily Larkin Folsom Reflects active officers as of December 31, 2025. Schedule 3

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