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| FIRSTENERGY CORP. |
| LIST OF SUBSIDIARIES OF THE REGISTRANT |
| AT DECEMBER 31, 2020 |
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| FirstEnergy Service Company - Incorporated in Ohio |
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| FirstEnergy Transmission, LLC - Organized in Delaware |
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| FirstEnergy Ventures Corp. - Incorporated in Ohio |
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| Jersey Central Power & Light Company - Incorporated in New Jersey |
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| Metropolitan Edison Company - Incorporated in Pennsylvania |
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| Monongahela Power Company - Incorporated in Ohio |
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| Ohio Edison Company - Incorporated in Ohio |
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| Pennsylvania Electric Company - Incorporated in Pennsylvania |
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| The Cleveland Electric Illuminating Company - Incorporated in Ohio |
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| The Potomac Edison Company - Incorporated in Maryland |
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| The Toledo Edison Company - Incorporated in Ohio |
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| West Penn Power Company - Incorporated in Pennsylvania |
