On the Record · NorthWestern Energy Group
NorthWestern Energy Group subsidiaries, as it lists them
The subsidiaries NorthWestern Energy Group lists in its latest annual report, with the jurisdiction of each, linked to the filing.
Subsidiaries it lists
| Subsidiary | Jurisdiction |
|---|---|
| NorthWestern Corporation | Delaware |
| NorthWestern Energy Public Service Corporation | South Dakota |
| The Clark Fork and Blackfoot, L.L.C. | Montana |
| NorthWestern Services, LLC | Delaware |
| Canadian-Montana Pipe Line Corporation | Canada |
| Risk Partners Assurance, Ltd. | Bermuda |
| Lodge Creek Pipelines, LLC | Nevada |
| Willow Creek Gathering, LLC | Nevada |
| Havre Pipeline Company, LLC | Texas |
| NorthWestern Energy Solutions, Inc. | Delaware |
| NorthWestern Great Falls Gas LLC | Montana |
| NorthWestern Cut Bank Gas LCC | Montana |
| Colstrip Property Holdings LLC | Montana |
| NorthWestern Colstrip 222Av LLC | Montana |
| NorthWestern Colstrip 370Pu LLC | Montana |
From Exhibit 21 of the 10-K for 2025. Companies must list their significant subsidiaries there and may leave out smaller ones, so this is the company’s own list, not every entity it owns.
Read from NorthWestern Energy Group’s annual reports (10-K for 2025, 10-K for 2024, 10-K for 2023) and the financial data it files with the SEC, as of 2026-02-12. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.