NORTHWESTERN ENERGY GROUP, INC. Subsidiaries
Every subsidiary the company listed in Exhibit 21 of its annual reports, newest list first (3 lists). Names and jurisdictions are as filed.
- 2026-02-12: Subsidiary DIRECT AND INDIRECT SUBSIDIARIES OF.
- 2026-02-12: Subsidiary NorthWestern Corporation; Jurisdiction Delaware.
- 2026-02-12: Subsidiary NorthWestern Energy Public Service Corporation; Jurisdiction South Dakota.
- 2026-02-12: Subsidiary The Clark Fork and Blackfoot, L.L.C.; Jurisdiction Montana.
| Annual report filed | Subsidiary | Jurisdiction |
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| 2026-02-12 | DIRECT AND INDIRECT SUBSIDIARIES OF | |
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| 2026-02-12 | NorthWestern Corporation | Delaware |
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| 2026-02-12 | NorthWestern Energy Public Service Corporation | South Dakota |
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| 2026-02-12 | The Clark Fork and Blackfoot, L.L.C. | Montana |
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| 2026-02-12 | NorthWestern Services, LLC | Delaware |
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| 2026-02-12 | Canadian-Montana Pipe Line Corporation | Canada |
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| 2026-02-12 | Risk Partners Assurance, Ltd. | Bermuda |
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| 2026-02-12 | Lodge Creek Pipelines, LLC | Nevada |
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| 2026-02-12 | Willow Creek Gathering, LLC | Nevada |
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| 2026-02-12 | Havre Pipeline Company, LLC | Texas |
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| 2026-02-12 | NorthWestern Energy Solutions, Inc. | Delaware |
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| 2026-02-12 | NorthWestern Great Falls Gas LLC | Montana |
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| 2026-02-12 | NorthWestern Cut Bank Gas LCC | Montana |
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| 2026-02-12 | Colstrip Property Holdings LLC | Montana |
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| 2026-02-12 | NorthWestern Colstrip 222Av LLC | Montana |
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| 2026-02-12 | NorthWestern Colstrip 370Pu LLC | Montana |
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| 2025-02-13 | DIRECT AND INDIRECT SUBSIDIARIES OF | |
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| 2025-02-13 | NorthWestern Corporation | Delaware |
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| 2025-02-13 | NorthWestern Energy Public Service Corporation | South Dakota |
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| 2025-02-13 | The Clark Fork and Blackfoot, L.L.C. | Montana |
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| 2025-02-13 | NorthWestern Services, LLC | Delaware |
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| 2025-02-13 | Canadian-Montana Pipe Line Corporation | Canada |
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| 2025-02-13 | Risk Partners Assurance, Ltd. | Bermuda |
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| 2025-02-13 | Lodge Creek Pipelines, LLC | Nevada |
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| 2025-02-13 | Willow Creek Gathering, LLC | Nevada |
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| 2025-02-13 | Havre Pipeline Company, LLC | Texas |
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| 2025-02-13 | NorthWestern Energy Solutions, Inc. | Delaware |
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| 2024-02-15 | DIRECT AND INDIRECT SUBSIDIARIES OF | |
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| 2024-02-15 | NorthWestern Corporation | Delaware |
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| 2024-02-15 | NorthWestern Energy Public Service Corporation | South Dakota |
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| 2024-02-15 | The Clark Fork and Blackfoot, L.L.C. | Montana |
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| 2024-02-15 | NorthWestern Services, LLC | Delaware |
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| 2024-02-15 | Canadian-Montana Pipe Line Corporation | Canada |
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| 2024-02-15 | Risk Partners Assurance, Ltd. | Bermuda |
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| 2024-02-15 | Lodge Creek Pipelines, LLC | Nevada |
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| 2024-02-15 | Willow Creek Gathering, LLC | Nevada |
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| 2024-02-15 | Havre Pipeline Company, LLC | Texas |
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| 2024-02-15 | NorthWestern Energy Solutions, Inc. | Delaware |
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