- Arizona Public Service
- Avangrid
- Avista
- Basin Electric Power Cooperative
- Black Hills Energy
- Bonneville Power Administration
- Calpine
- Chelan County PUD
- Clatskanie PUD
- Douglas County PUD
- Eugene Water & Electric Board
- Grant PUD
- Idaho Power
- Northwestern Energy
- NVEnergy
- PacifiCorp
- Portland General Electric
- Powerex
- Puget Sound Energy
- Salt River Project
- Seattle City Light
- Shell Energy
- Snohomish County PUD
- Tacoma Power
- The Energy Authority
- Turlock Irrigation District
