skos:altLabel | - GPU
- Potomac Edison Company
- West Penn Power
- Associated Gas and Electric
- Centerior Energy
- Cleveland Electric Illuminating
- Cleveland Electric Illuminating Co.
- Cleveland Electric Illuminating Company
- First Energy
- First Energy Corp.
- FirstEnergy Corp
- FirstEnergy Corp.
- FirstEnergy Corporation
- FirstEnergy#Centerior
- GPU Energy
- General Public Utilities
- General Public Utilities Nuclear
- General Public Utilities, Inc.
- Illuminating Company
- Jersey Central Power & Light
- Jersey Central Power & Light Company
- Jersey Central Power and Light Corporation
- MYR Group
- Met-Ed
- Metropolitan Edison
- Metropolitan Edison Company
- Mon Power
- Ohio Edison
- Ohio Edison (now FirstEnergy)
- Penn Power
- Pennsylvania Electric Company
- Toledo Edison
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