• Alpena Power Company
• Consumers Energy Company
• Detroit Edison Company
• Edison Sault Electric Company
• Indiana Michigan Power Company
• Northern States Power Company-Wisconsin
• Upper Peninsula Power Company
• Wisconsin Public Service Corporation
• Wisconsin Electric Power Company

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• Bayfield Electric Cooperative
• Cloverland Electric Cooperative
• Great Lakes Energy Cooperative
• Midwest Energy Cooperative
• Ontonagon County Rural Electricification Association
• Presque Isle Electric and Gas Co-op
• Thumb Electric Cooperative

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• Consumers Energy Company
• Michigan Consolidated Gas Company
• Michigan Gas Utilities Corporation
• Northern States Power Company - Wisconsin
• SEMCO Energy, Inc.
• Wisconsin Public Service Corporation

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• City of Bay City (U-15849)
• City of Charlevoix
• City of Crystal Falls
• City of Dowagiac
• City of Eaton Rapids
• City of Escanaba
• City of Gladstone
• City of Harbor Springs
• City of Hart Hydro
• City of Norway
• City of Paw Paw
• City of Petoskey
• City of Portland
• City of Sebewaing
• City of South Haven
• City of St. Louis
• City of Stephenson
• City of Sturgis
• City of Wakefield
• Chelsea Department of Electric and Water
• Coldwater Board of Public Utilities
• Croswell Municipal Light & Power Department
• Daggett Electric Department
• Detroit Public Lighting Department
• Grand Haven Board of Light and Power
• Hillsdale Board of Public Utilities
• Holland Board of Public Works
• Lansing Board of Water & Light
• Lowell Light and Power
• Marquette Board of Light and Power
• Marshall Electric Department
• Negaunee Department of Public Works
• Newberry Water and Light Board
• Niles Utility Department
• Traverse City Light & Power
• Union City Electric Department
• Wyandotte Department of Municipal Service
• Village of Baraga
• Village of Clinton
• Village of L'Anse
• Zeeland Board of Public Works

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• Alger Delta Cooperative Electric Association
• Cherryland Electric Cooperative
• Tri-County Electric Cooperative