| Arizona Public Service (APS) |
| Avista Corporation |
| Bonneville Power Administration (BPA) |
| California Independent System Operator (CAISO) |
| Idaho Power |
| Los Angeles Department of Water & Power (LADWP) |
| Mid-American |
| Pacific Gas and Electric (PG&E) |
| PNM |
| Portland General Electric |
| Puget Sound Energy (PSE) |
| Southern California Edison (SCE) |
| San Diego Gas & Electric Co. |
| Sierra Pacific |
| Sacramento Municipal Utility District (SMUD) |
| Salt River Project |
| Western Electric Coordinating Council (WECC) |