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Exhibit 21.1
WEC ENERGY GROUP, INC.
SUBSIDIARIES AS OF DECEMBER 31, 2025

The following table includes the subsidiaries of WEC Energy Group, a diversified holding company incorporated in the state of Wisconsin, as well as the percent of ownership, as of December 31, 2025:
Subsidiary *State of Incorporation or OrganizationPercent Ownership
ATC Holding LLCWisconsin100%
American Transmission Company LLCWisconsin60.34%
ATC Development Manager, Inc.Delaware74.73%
ATC Holdco LLCDelaware75.17%
ATC Management Inc.Wisconsin60.32%
Bluewater Natural Gas Holding, LLCDelaware100%
BGS Kimball Gas Storage, LLCDelaware100%
Bluewater Gas Storage, LLCDelaware100%
Integrys Holding, Inc. Wisconsin100%
Michigan Gas Utilities Corporation Delaware100%
Minnesota Energy Resources CorporationDelaware100%
Peoples Energy, LLCDelaware100%
North Shore Gas CompanyIllinois100%
   The Peoples Gas Light and Coke CompanyIllinois100%
Wisconsin Public Service Corporation Wisconsin100%
Wisconsin River Power Company Wisconsin50%
Upper Michigan Energy Resources CorporationMichigan100%
W.E. Power, LLCWisconsin100%
Elm Road Generating Station Supercritical, LLCWisconsin100%
Elm Road Services, LLCWisconsin100%
Port Washington Generating Station, LLCWisconsin100%
WEC Business Services LLCDelaware100%
WEC Infrastructure LLCDelaware100%
Delilah Solar Holdings LLCDelaware90%
HSE3 Holdings LLC
Delaware
90%
Samson OpCo Holdings LLCDelaware90%
WEC Infrastructure Wind Holding I LLCDelaware100%
     Bishop Hill Energy III Holdings LLCDelaware90%
     Blooming Grove Wind Energy Center Holdings LLCDelaware90%
     Coyote Ridge Wind, LLCOregon82.61%
     Upstream Wind Energy Holdings LLCDelaware90%
WEC Infrastructure Wind Holding II LLCDelaware100%
     Jayhawk Wind, LLCDelaware90%
     Tatanka Ridge Wind, LLCDelaware85.68%
WEC Infrastructure Energy Holding III LLCDelaware100%
     Maple Flats Holding LLCDelaware90%
     Sapphire Sky Wind Energy Holdings LLCDelaware90%
     Thunderhead Wind Energy Holdings LLCDelaware90%
WEC Investments, LLCDelaware100%
Wisconsin Electric Power CompanyWisconsin100%
Wisconsin Gas LLCWisconsin100%
Wispark LLC
Wisconsin100%

*    Omits the names of certain subsidiaries, which if considered in the aggregate as a single subsidiary, would not constitute a "significant subsidiary" as of December 31, 2025. Indirectly owned subsidiaries are listed under the subsidiaries through which WEC Energy Group holds ownership.