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REGULATORY MATTERS - Pennsylvania and West Virginia (Details) $ in Millions |  |  |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 13, 2023 USD ($) | Aug. 25, 2022 USD ($) MW | May 01, 2022 USD ($) | Mar. 17, 2022 | Nov. 22, 2021 site MW | Jan. 16, 2020 USD ($) | Mar. 31, 2023 USD ($) proposal
FERC | Regulated Transmission |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Pre-tax impairment of regulatory asset |  |  |  |  |  |  | $ 25.0
FERC | Transmission Related Vegetation Management Programs | FirstEnergy |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Customer refund |  |  |  |  |  |  | 45.0
Customer refund, net |  |  |  |  |  |  | 34.0
Capital assets |  |  |  |  |  |  | 195.0
Operating expense |  |  |  |  |  |  | 90.0
Operating expense, net |  |  |  |  |  |  | 67.0
Reduction in operating expense |  |  |  |  |  |  | $ 160.0
Pennsylvania | DSP June 2019- May 2023 |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Number of RFP's | proposal |  |  |  |  |  |  | 2
RFP term |  |  |  |  |  |  | 2 years
Pennsylvania | Three month period | DSP June 2019- May 2023 |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  | 3 months
Pennsylvania | Twelve month period | DSP June 2019- May 2023 |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  | 12 months
Pennsylvania | Twenty-four month period | DSP June 2019- May 2023 |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  | 24 months
Pennsylvania | Pennsylvania Companies | PPUC | New LTIIPs |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Recovery period |  |  |  |  |  | 5 years |
Amount of requested rate increase (decrease) |  |  |  |  |  | $ 572.0 |
Pennsylvania | ME | PPUC | EE&C Phase IV |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  | 2.90%
Energy consumption reduction targets |  |  |  |  |  |  | 3.10%
Pennsylvania | PN | PPUC | EE&C Phase IV |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  | 3.30%
Energy consumption reduction targets |  |  |  |  |  |  | 3.00%
Pennsylvania | Penn | PPUC | EE&C Phase IV |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  | 2.00%
Energy consumption reduction targets |  |  |  |  |  |  | 2.70%
Pennsylvania | WP | PPUC | EE&C Phase IV |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  | 2.50%
Energy consumption reduction targets |  |  |  |  |  |  | 2.40%
West Virginia | MP and PE | WVPSC |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Requested amount of annual depreciation expense | $ 75.5 |  |  |  |  |  |
West Virginia | MP and PE | WVPSC | ENEC |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  | $ 183.8 |  |  |  |  |
Under recovered amount, percent |  | 12.20% |  |  |  |  |
Supplemental requested decrease |  | $ 145.0 |  |  |  |  |
Approved amount of annual increase |  | $ 92.0 |  |  |  |  |
Approved ROE |  | 4.00% |  |  |  |  |
Plant capacity (in MW's) | MW |  | 1,200 |  |  |  |  |
West Virginia | MP and PE | WVPSC | Solar Generation Project |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  | 50 |  |
Percent of subscriptions required prior to commencement of construction |  |  |  | 85.00% |  |  |
Number of proposed solar sites | site |  |  |  |  | 3 |  |
Number of solar sites | site |  |  |  |  | 5 |  |
Expected cost of the program |  |  | $ 110.0 |  |  |  |

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