- Adams Electric Cooperative
- Clay Electric Co-operative, Inc.
- Clinton County Electric Cooperative, Inc.
- Coles-Moultrie Electric Cooperative
- Corn Belt Energy Corporation
- Eastern Illini Electric Cooperative
- Egyptian Electric Cooperative, Assn.
- EnerStar Electric Cooperative
- Illinois Electric Cooperative
- Jo-Carroll Energy, Inc.
- McDonough Power Cooperative
- M.J.M. Electric Cooperative, Inc.
- Menard Electric Cooperative
- Monroe County Electric Cooperative, Inc.
- Norris Electric Cooperative
- Rock Energy Cooperative
- Rural Electric Convenience Cooperative Co.
- Shelby Electric Cooperative
- SouthEastern Illinois Electric Cooperative, Inc.
- Southern Illinois Electric Cooperative
- Southwestern Electric Cooperative, Inc.
- Spoon River Electric Cooperative
- Tri-County Electric Cooperative, Inc.
- Wayne-White Electric Cooperative
- Western Illinois Electrical Coop.
