19??–20??[]
SVG NEEDED |
UNKNOWN YEAR |
20??–present[]
UNKNOWN YEAR |
AEP Ohio | AEP Texas | Appalachian Power | Indiana Michigan Power | Kentucky Power | Public Service Company of Oklahoma | Southwestern Electric Power Company |
SVG NEEDED |
UNKNOWN YEAR |
UNKNOWN YEAR |
AEP Ohio | AEP Texas | Appalachian Power | Indiana Michigan Power | Kentucky Power | Public Service Company of Oklahoma | Southwestern Electric Power Company |