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REGULATORY MATTERS - Pennsylvania and West Virginia (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Jan. 23, 2024 USD ($) | Nov. 30, 2023 USD ($) | Aug. 31, 2023 USD ($) | Aug. 30, 2023 USD ($) | Aug. 22, 2023 USD ($) | May 31, 2023 USD ($) | Apr. 24, 2023 MW | Mar. 06, 2023 USD ($) | Jan. 13, 2023 USD ($) | Aug. 25, 2022 USD ($) MW | May 01, 2022 | Nov. 22, 2021 MW site | Jan. 16, 2020 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($)
Transmission Related Vegetation Management Programs | FERC | FE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities reclassification to operating expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 105,000 | $ 13,000
Pennsylvania | PPUC | Pennsylvania Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Public utilities, settlement amount |  |  |  | $ 650 |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | ENEC Phase IV | PPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved energy consumption reduction targets, cost recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 390,000
Pennsylvania | ENEC Phase IV | PPUC | ME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.90%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.10%
Pennsylvania | ENEC Phase IV | PPUC | PN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.30%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00%
Pennsylvania | ENEC Phase IV | PPUC | Penn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.70%
Pennsylvania | ENEC Phase IV | PPUC | WP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.40%
Pennsylvania | New LTIP's | PPUC | Pennsylvania Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  | 5 years |  |  |  |  | 5 years |  |
Amount of requested rate increase |  |  |  |  |  |  |  | $ 572,000 |  |  |  |  | $ 572,000 |  |
West Virginia | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  | $ 17,000 |  |  | $ 207,000 |  |  |  |  |  |  |  |  |
Requested amount of annual depreciation expense |  |  |  |  |  | $ 76,000 |  |  | $ 76,000 |  |  |  |  |  |
Increase in annual amount of depreciation expense |  |  |  |  | $ 33,000 |  |  |  |  |  |  |  |  |  |
Recovery period for expenditures for cost recovery program |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of rate increase (decrease) | $ 105,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in annual amount of depreciation expense | $ 33,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | Solar Generation Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  | 30 |  |  |  |  | 50 |  |  |
Number of solar sites | site |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Percent of subscriptions required prior to commencement |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |
Expected cost of the program |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 110,000
Number of approved solar sites | site |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
West Virginia | ENEC | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  | $ 167,500 |  |  |  |  |  |  | $ 183,800 |  |  |  |  |
Under recovered amount, percent |  |  | 9.90% |  |  |  |  |  |  | 12.20% |  |  |  |  |
Supplemental requested decrease |  |  | $ 267,000 |  |  |  |  |  |  | $ 145,000 |  |  |  |  |
Approved amount of rate increase (decrease) |  | $ 55,400 |  |  |  |  |  |  |  | $ 92,000 |  |  |  |  |
Recovery amounts |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Approved ROE |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  | 1,300 |  |  |  |  |
Deferred requested rate increase |  |  | 92,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount not recovered |  |  | $ 75,600 |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | Expanded Net Energy Cost Through 2026 | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of rate increase (decrease) |  | $ 255,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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