I was perusing the wiki and see that 40000 got tagged Greensburg DCC. A while back, a facility was heard answering a unit calling on this channel using "Fairmont Dispatch" and the woman had a distinctly WV accent, leading me to believe it was the Fairmont TCC.
Here is a list I started putting together of FE facilities for PA. I'm not sure of the significance of the "service center" versus "line" tag. I mined these locations from various web sources. Some of them just had the location name which I appended with "line" if it didn't specify based on the talkgroup listing on the regional FirstEnergy TRS covering WV, MD, NJ, etc. If anybody wants to wiki this up, feel free. I'm in PECO territory, so I haven't heard electric utility comms in a decade or more since they went encrypted. The only time I'll be particularly interested in FE comms is if I travel across the state. My evening boredom gets you this starter for further talkgroup speculation:
FE Regional Transmission Control Centers (TCC)
Akron, OH
Fairmont, WV (heard "Fairmont Dispatch" answering a field unit on 40000)
Met-Ed
Reading DCC
Boyertown Service Center
Dillsburg Line
Easton Service Center
Hamburg Service Center
Hanover Line
Lebanon Line
Middletown Line
Penelec
Erie DCC
Alexandria Line
Bradford Line
Clearfield Line
DuBois Line
Erie Line
Indiana Line
Johnstown Line
Lewistown
Mansfield Line
Meadville Line
Montrose Line
Oil City Line
Phillipsburg Line
Shippensburg Line
State College Service Center
Towanda Line
Warren Line
Penn Power
???
West Penn Power
Greensburg DCC
Arnold Service Center
Boyce
Butler Line
Charleroi Service Center
Jeannette Service Center
Jefferson Service Center
Latrobe Service Center
McConnellsburg Line
Pleasant Valley Service Center
Somerset Line
Uniontown Line
Washington Line