| AEE | Ameren |
| AEP | American Electric Power Company |
| CNP | CenterPoint Energy |
| D | Dominion Energy |
| DTE | DTE Energy Company |
| DUK | Duke Energy |
| ED | Consolidated Edison |
| EIX | Edison |
| ETR | Entergy |
| EXC | Exelon |
| LNT | Alliant Energy |
| PEG | Public Service Enterprise Group |
| PNW | Pinnacle West Capital |
| SO | Southern Company |
| XEL | Xcel Energy |