| Acciona Wind Energy USA | GPM |
| AE Power Services LLC | GPM |
| AES Shady Point LLC | GPM |
| ALLETE, Inc. d/b/a Minnesota Power | IOU |
| Alliant Energy | IOU |
| American Electric Power | IOU |
| American Transmission Company | TSO |
| Ames Municipal Electric System | MU |
| Arkansas Electric Cooperative Corporation (AECC) | C |
| Badger Power Marketing Authority of Wisconsin | MU |
| Basin Electric Power Cooperative | C |
| Board of Water, Electric, & Communications of the City Muscatine Iowa d/b/a Muscatine Power & Water | MU |
| Capital Power Corporation | GPM |
| Caprock Wind, LLC | GPM |
| Cedar Falls Utilities | MU |
| Central Iowa Power Cooperative | C |
| Central Power Electric Cooperative, Inc. | C |
| City of Independence Power & Light | MU |
| City Utilities of Springfield, Missouri | MU |
| Coffeyville Municipal Light & Power | MU |
| Corn Belt Power Cooperative | C |
| Dairyland Power Cooperative | C |
| Dogwood Power Management, LLC | GPM |
| Dominion Energy Marketing, Inc. | ADJ |
| East River Electric Power Cooperative, Inc. | C |
| Flat Ridge 2 Wind Energy LLC | GPM |
| Flat Ridge Wind Energy LLC | GPM |
| Glencoe Light and Power | MU |
| Golden Spread Electric Cooperative, Inc. | C |
| Grand River Dam Authority | C |
| Great River Energy | C |
| Green Country Energy | GPM |
| Hastings Utilities | MU |
| Heartland Consumers Power District | MU |
| Iberdrola Renewables (aka. PPM Energy, Inc) | GPM |
| Iowa Association of Municipal Utilities | MU |
| Iowa Industrial Energy Group | ADJ |
| ITC Midwest LLC | TSO |
| Kansas City Board of Public Utilities | MU |
| Kansas City Power and Light | IOU |
| Kansas Electric Power Cooperative, Inc. | C |
| Lincoln Electric System | MU |
| Madison Gas and Electric Company | IOU |
| Manitoba Hydro | CU |
| Marshfield Utilities | MU |
| McKenzie Electric Cooperative | C |
| MidAmerican Energy Company | IOU |
| Midcontinent Independent System Operator, Inc. | TSO |
| Midwest Energy Inc | C |
| Minnesota Chamber of Commerce | ADJ |
| Minnkota Power Cooperative, Inc. | C |
| Missouri Basin Municipal Power Agency d/b/a Missouri River Energy Services | MU |
| Montana-Dakota Utilities Company | IOU |
| Moorhead Public Service | MU |
| Mountrail-Williams Electric Cooperative | C |
| Nebraska Public Power District | C |
| New Ulm Public Utilities | MU |
| NextEra Energy Resources, LLC | GPM |
| Northern States Power Company d/b/a Xcel Energy | IOU |
| Northwestern Energy | IOU |
| Odell Wind Farm | GPM |
| Oklahoma Gas and Electric | IOU |
| Oklahoma Municipal Power Authority | MU |
| Omaha Public Power District | C |
| Otter Tail Power Company | IOU |
| Pattern Operators LP | GPM |
| Proven Compliance Solutions | ADJ |
| Ramakrishna Gokaraju, University of Saskatchewan | ADJ |
| Rochester Public Utilities | MU |
| Saskatchewan Power Corporation | CU |
| Sheridan Electric Cooperative, Inc. | C |
| Southern Minnesota Municipal Power Agency | MU |
| Southern Power Company | GPM |
| Southwest Power Pool | TSO |
| Southwestern Power Administration | FPMA |
| Southwestern Public Service Company | IOU |
| Sunflower Electric Power Corporation | C |
| Tenaska Power Services Co. | GPM |
| The Empire District Electric Company | IOU |
| The Energy Authority | GPM |
| Upper Missouri Power Cooperative | C |
| Upper Peninsula Power Co. | IOU |
| Utility Services, Inc. | ADJ |
| Westar Energy | IOU |
| Western Area Power Administration | FPMA |
| Western Farmers Electric Cooperative | C |
| Willmar Municipal Utilities | MU |
| Wisconsin Industrial Energy Group | ADJ |
| Wisconsin Public Service Corporation | IOU |
| Wisconsin Rapids Water Works and Lighting Commission | MU |
| WPPI Energy | MU |
