Northwestern Energy Group, Inc.NASDAQ: NWE

2025 HPC Annual Report

· Issued by 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

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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

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3

4

5

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11

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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