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REGULATORY MATTERS - Pennsylvania and West Virginia (Details) $ in Millions |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 13, 2023 USD ($) | Aug. 25, 2022 USD ($) | May 17, 2022 USD ($) | Dec. 29, 2021 USD ($) | Dec. 27, 2021 USD ($) | Dec. 17, 2021 USD ($) | Nov. 22, 2021 USD ($) plant MW | Nov. 18, 2021 USD ($) | Aug. 27, 2021 USD ($) | Aug. 30, 2019 USD ($) | Jun. 01, 2019 proposal | Dec. 31, 2021 USD ($) | Jun. 18, 2020
Pennsylvania | PPUC |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revised requested rate increase |  |  |  |  |  |  |  | $ 61.0 |  |  |  |  |
Pennsylvania | PPUC | Utilities and Transmission Companies |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax charges |  |  |  |  |  |  |  |  |  |  |  | $ 61.0 |
Pennsylvania | PPUC | Penn | ENEC Phase IV |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Approved demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  | 2.00%
Approved energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  | 2.70%
Pennsylvania | PPUC | WP | ENEC Phase IV |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Approved demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  | 2.50%
Approved energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  | 2.40%
Pennsylvania | PPUC | Pennsylvania Companies | DSP |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of RFP's | proposal |  |  |  |  |  |  |  |  |  |  | 2 |  |
Project term |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Pennsylvania | PPUC | Pennsylvania Companies | DSP | 3 Month Period |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Energy contract term |  |  |  |  |  |  |  |  |  |  | 3 months |  |
Pennsylvania | PPUC | Pennsylvania Companies | DSP | 12 Month Period |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Energy contract term |  |  |  |  |  |  |  |  |  |  | 12 months |  |
Pennsylvania | PPUC | Pennsylvania Companies | DSP | 24 Month Period |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Energy contract term |  |  |  |  |  |  |  |  |  |  | 24 months |  |
Pennsylvania | PPUC | Pennsylvania Companies | New LTIP's |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cost recovery period |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  | $ 572.0 |  |  |
Pennsylvania | PPUC | PN | ENEC Phase IV |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Approved demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  | 3.30%
Approved energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  | 3.00%
Pennsylvania | PPUC | ME | ENEC Phase IV |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Approved demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  | 2.90%
Approved energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  | 3.10%
West Virginia | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of solar generation sites | plant |  |  |  |  |  |  | 5 |  |  |  |  |  |
Solar generation plant capacity (in MW's) | MW |  |  |  |  |  |  | 50 |  |  |  |  |  |
Public utilities, interim rate increase (decrease), amount |  |  | $ 94.0 |  |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requested amount of annual depreciation expense | $ 75.5 |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | Ft. Martin and Harrison Power Stations |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requested annual rate increase |  |  |  |  |  | $ 3.0 |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  | $ 142.0 |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | Solar Generation Project |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Solar generation plant capacity (in MW's) | MW |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |
Expected cost of the program |  |  |  |  |  |  | $ 110.0 |  |  |  |  |  |
Percent of subscriptions required prior to commencement |  |  |  |  |  |  | 85.00% |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | ENEC |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of rate increase (decrease) |  | $ 92.0 |  |  |  |  |  |  |  |  |  |  |
Approved ROE |  | 4.00% |  |  |  |  |  |  |  |  |  |  |
Public utilities, supplemental approved annual rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ (7.7) |  |  |  |
Requested rate increase (decrease) |  | $ 183.8 |  |  |  |  |  |  |  |  |  |  |
Under recovered amount, percent |  | 12.20% |  |  |  |  |  |  |  |  |  |  |
Supplemental requested decrease |  | $ 144.9 |  |  |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | Integrated Resource Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of rate increase (decrease) |  |  |  | $ 19.6 |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | Vegetation Management Surcharge Rates |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of rate increase (decrease) |  |  |  |  | $ 16.0 |  |  |  |  |  |  |  |
Surcharge period |  |  |  |  | 2 years |  |  |  |  |  |  |  |

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