WEC ENERGY GROUP, INC. Subsidiaries
Every subsidiary the company listed in Exhibit 21 of its annual reports, newest list first (18 lists). Names and jurisdictions are as filed.
- 2026-02-20: Subsidiary ATC Holding LLC; Jurisdiction Wisconsin.
- 2026-02-20: Subsidiary American Transmission Company LLC; Jurisdiction Wisconsin.
- 2026-02-20: Subsidiary ATC Development Manager, Inc.; Jurisdiction Delaware.
- 2026-02-20: Subsidiary ATC Holdco LLC; Jurisdiction Delaware.
| Annual report filed | Subsidiary | Jurisdiction |
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| 2026-02-20 | ATC Holding LLC | Wisconsin |
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| 2026-02-20 | American Transmission Company LLC | Wisconsin |
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| 2026-02-20 | ATC Development Manager, Inc. | Delaware |
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| 2026-02-20 | ATC Holdco LLC | Delaware |
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| 2026-02-20 | ATC Management Inc. | Wisconsin |
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| 2026-02-20 | Bluewater Natural Gas Holding, LLC | Delaware |
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| 2026-02-20 | BGS Kimball Gas Storage, LLC | Delaware |
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| 2026-02-20 | Bluewater Gas Storage, LLC | Delaware |
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| 2026-02-20 | Integrys Holding, Inc. | Wisconsin |
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| 2026-02-20 | Michigan Gas Utilities Corporation | Delaware |
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| 2026-02-20 | Minnesota Energy Resources Corporation | Delaware |
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| 2026-02-20 | Peoples Energy, LLC | Delaware |
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| 2026-02-20 | North Shore Gas Company | Illinois |
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| 2026-02-20 | The Peoples Gas Light and Coke Company | Illinois |
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| 2026-02-20 | Wisconsin Public Service Corporation | Wisconsin |
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| 2026-02-20 | Wisconsin River Power Company | Wisconsin |
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| 2026-02-20 | Upper Michigan Energy Resources Corporation | Michigan |
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| 2026-02-20 | W.E. Power, LLC | Wisconsin |
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| 2026-02-20 | Elm Road Generating Station Supercritical, LLC | Wisconsin |
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| 2026-02-20 | Elm Road Services, LLC | Wisconsin |
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| 2026-02-20 | Port Washington Generating Station, LLC | Wisconsin |
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| 2026-02-20 | WEC Business Services LLC | Delaware |
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| 2026-02-20 | WEC Infrastructure LLC | Delaware |
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| 2026-02-20 | Delilah Solar Holdings LLC | Delaware |
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| 2026-02-20 | HSE3 Holdings LLC | Delaware |
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| 2026-02-20 | Samson OpCo Holdings LLC | Delaware |
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| 2026-02-20 | WEC Infrastructure Wind Holding I LLC | Delaware |
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| 2026-02-20 | Bishop Hill Energy III Holdings LLC | Delaware |
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| 2026-02-20 | Blooming Grove Wind Energy Center Holdings LLC | Delaware |
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| 2026-02-20 | Coyote Ridge Wind, LLC | Oregon |
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| 2026-02-20 | Upstream Wind Energy Holdings LLC | Delaware |
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| 2026-02-20 | WEC Infrastructure Wind Holding II LLC | Delaware |
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| 2026-02-20 | Jayhawk Wind, LLC | Delaware |
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| 2026-02-20 | Tatanka Ridge Wind, LLC | Delaware |
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| 2026-02-20 | WEC Infrastructure Energy Holding III LLC | Delaware |
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| 2026-02-20 | Maple Flats Holding LLC | Delaware |
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| 2026-02-20 | Sapphire Sky Wind Energy Holdings LLC | Delaware |
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| 2026-02-20 | Thunderhead Wind Energy Holdings LLC | Delaware |
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| 2026-02-20 | WEC Investments, LLC | Delaware |
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| 2026-02-20 | Wisconsin Electric Power Company | Wisconsin |
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| 2026-02-20 | Wisconsin Gas LLC | Wisconsin |
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| 2026-02-20 | Wispark LLC | Wisconsin |
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