- Central Maine Power Company
- Emera Maine - Bangor Hydro Electric
- Emera Maine - Maine Public
- Eastern Maine Electric Cooperative
- Fox Islands Electric Cooperative Inc.
- Matinicus Plantation Electric Company
- Kennebunk Light & Power District
- Madison Electric Works
- NB Power
- Houlton Water Company
- Swans Island Electric Coop, Inc.
- Van Buren Light & Power District