| Adams Electric Cooperative Inc | PA |
| Agralite Electric Cooperative | MN |
| Avista Utilities | ID, MT, WA |
| Beltrami Electric Coop Inc. | MN |
| BENCO Electric Cooperative | MN |
| Benton PUD | WA |
| Berkeley Electric Cooperative | SC |
| Blue Ridge Energy | NC |
| Brunswick Electric Membership Corporation (BEMC) | NC |
| CenterPoint Energy | TX |
| Central Lincoln | OR |
| Clallam County PUD | WA |
| Citizens' Electric Company | PA |
| City of Monroe, NC | NC |
| City of Ocala | FL |
| City of Shelby | NC |
| CORE Electric Cooperative | CO |
| Cowlitz Public Utility District #1 | WA |
| Dakota Electric Association | MN |
| Delaware Electric Cooperative | DE |
| DEMCO | LA |
| Douglas County PUD | WA |
| East Central Energy | MN, WI |
| Federated Rural Electric Association | MN |
| Four County EMC | NC |
| Freeborn Mower Electric Cooperative | IA, MN |
| Goodhue County Cooperative Electric Association (GCCEA) | MN |
| Grand Valley Power | CO |
| Grayson Collin Electric Cooperative | TX |
| Habersham EMC | GA |
| Holy Cross Energy | CO |
| Horry Electric Cooperative | SC |
| Jefferson County PUD | WA |
| Jones-Onslow EMC | NC |
| Kandiyohi Power Cooperative | MN |
| Knoxville Utilities Board | TN |
| Lake Country Power | MN |
| Lake Region Electric Cooperative | MN |
| Lumbee River EMC | NC |
| Mason County PUD #1 | WA |
| Mason County PUD 3 | WA |
| McLeod Cooperative Power Association | MN |
| Meeker Cooperative Light & Power Association | MN |
| MiEnergy Cooperative | IA, MN |
| Mille Lacs Energy Cooperative | MN |
| Nobles Cooperative Electric | IA, MN |
| Norwood Municipal Light (NMLD) | MA |
| Orcas Power & Light Cooperative (OPALCO) | WA |
| PacifiCorp | OR, WA, CA |
| Pend Oreille Public Utility District No. 1 | WA |
| People's Energy Cooperative | MN |
| Portland General Electric | OR |
| Public Utility District No. 1 of Snohomish County (Snohomish County PUD) | WA |
| Puget Sound Energy | WA |
| Renville-Sibley Cooperative Power Association | MN |
| Runestone Electric Association | MN |
| Seattle City Light | WA |
| Sioux Valley Southwestern Electric Inc. (DBA Sioux Valley Energy) | MN, SD |
| South Central Indiana REMC | IN |
| Stearns Cooperative Association | MN |
| Tacoma Public Utilities | WA |
| Tanner Electric Cooperative | WA |
| Town of Apex | NC |
| Traverse Electric Cooperative, Inc. | MN, ND, SD |
| Unitil | MA, NH |
| Wild Rice Electric Cooperative | MN |
| Wright-Hennepin Cooperative Electric Association | MN |
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