On the Record · WEC Energy Group
WEC Energy Group subsidiaries, as it lists them
The subsidiaries WEC Energy Group lists in its latest annual report, with the jurisdiction of each, linked to the filing.
Subsidiaries it lists
| Subsidiary | Jurisdiction |
|---|---|
| ATC Holding LLC | Wisconsin |
| American Transmission Company LLC | Wisconsin |
| ATC Development Manager, Inc. | Delaware |
| ATC Holdco LLC | Delaware |
| ATC Management Inc. | Wisconsin |
| Bluewater Natural Gas Holding, LLC | Delaware |
| BGS Kimball Gas Storage, LLC | Delaware |
| Bluewater Gas Storage, LLC | Delaware |
| Integrys Holding, Inc. | Wisconsin |
| Michigan Gas Utilities Corporation | Delaware |
| Minnesota Energy Resources Corporation | Delaware |
| Peoples Energy, LLC | Delaware |
| North Shore Gas Company | Illinois |
| The Peoples Gas Light and Coke Company | Illinois |
| Wisconsin Public Service Corporation | Wisconsin |
| Wisconsin River Power Company | Wisconsin |
| Upper Michigan Energy Resources Corporation | Michigan |
| W.E. Power, LLC | Wisconsin |
| Elm Road Generating Station Supercritical, LLC | Wisconsin |
| Elm Road Services, LLC | Wisconsin |
| Port Washington Generating Station, LLC | Wisconsin |
| WEC Business Services LLC | Delaware |
| WEC Infrastructure LLC | Delaware |
| Delilah Solar Holdings LLC | Delaware |
| HSE3 Holdings LLC | Delaware |
| Samson OpCo Holdings LLC | Delaware |
| WEC Infrastructure Wind Holding I LLC | Delaware |
| Bishop Hill Energy III Holdings LLC | Delaware |
| Blooming Grove Wind Energy Center Holdings LLC | Delaware |
| Coyote Ridge Wind, LLC | Oregon |
| Upstream Wind Energy Holdings LLC | Delaware |
| WEC Infrastructure Wind Holding II LLC | Delaware |
| Jayhawk Wind, LLC | Delaware |
| Tatanka Ridge Wind, LLC | Delaware |
| WEC Infrastructure Energy Holding III LLC | Delaware |
| Maple Flats Holding LLC | Delaware |
| Sapphire Sky Wind Energy Holdings LLC | Delaware |
| Thunderhead Wind Energy Holdings LLC | Delaware |
| WEC Investments, LLC | Delaware |
| Wisconsin Electric Power Company | Wisconsin |
| Wisconsin Gas LLC | Wisconsin |
| Wispark LLC | Wisconsin |
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 WEC 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 2026-02-20. 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.