| AEP | American Electric Power Company |
| CMS | CMS Energy |
| CNP | CenterPoint Energy |
| D | Dominion Energy |
| DUK | Duke Energy |
| ED | Consolidated Edison |
| EIX | Edison |
| ETR | Entergy |
| EXC | Exelon |
| FE | FirstEnergy |
| PEG | Public Service Enterprise Group |
| PNW | Pinnacle West Capital |
| PPL | PPL |
| SO | Southern Company |