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REGULATORY MATTERS - Ohio (Details) meter in Thousands, $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
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Feb. 21, 2025 USD ($) | Dec. 18, 2024 USD ($) | Sep. 30, 2024 USD ($) payment | Jul. 31, 2024 USD ($) | May 31, 2024 USD ($) | Apr. 12, 2024 USD ($) meter | Apr. 05, 2023 | Jul. 15, 2022 USD ($) circuit meter | Jan. 31, 2025 USD ($) | Dec. 31, 2024 | May 15, 2024 USD ($) | Sep. 13, 2021 requirement | Aug. 06, 2021 USD ($)
CEI |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed ROE |  |  |  |  |  |  |  |  |  | 10.50% |  |  |
Allowed debt |  |  |  |  |  |  |  |  |  | 51.00% |  |  |
Approved capital structure |  |  |  |  |  |  |  |  |  | 49.00% |  |  |
MAIT |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed ROE |  |  |  |  |  |  |  |  |  | 10.50% |  |  |
Allowed debt |  |  |  |  |  |  |  |  |  | 51.00% |  |  |
Approved capital structure |  |  |  |  |  |  |  |  |  | 49.00% |  |  |
PUCO | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to spend |  |  |  |  |  |  |  |  | $ 6,500 |  |  |  |
PUCO | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of revenue increase |  |  |  |  |  |  |  |  | 37,000 |  |  |  |
PUCO | Minimum | Ohio Companies |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate plan period |  |  |  |  |  |  | 8 years |  |  |  |  |  |
PUCO | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of revenue increase |  |  |  |  |  |  |  |  | $ 43,000 |  |  |  |
ESP V | PUCO | Ohio Companies |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved bill assistance contribution, amount |  |  |  |  |  |  |  |  |  |  | $ 32,500 |  |
Ohio | PUCO |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed goal to reduce CO2 pollution (percent) |  | 90.00% |  |  |  |  |  |  |  |  |  |  |
Ohio | DCR Rider | PUCO |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual revenue cap for rider |  | $ 390,000 |  |  |  |  |  |  |  |  |  |  |
Annual revenue cap for DCR rider |  | 390,000 |  |  |  |  |  |  |  |  |  |  |
Requested increase in revenue cap |  | 15,000 |  |  |  |  |  |  |  |  |  |  |
Ohio | DCR Rider | PUCO | CEI | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed ROE |  |  |  |  | 10.80% |  |  |  |  |  |  |  |
Allowed debt |  |  |  |  | 44.00% |  |  |  |  |  |  |  |
Approved capital structure |  |  |  |  | 56.00% |  |  |  |  |  |  |  |
Ohio | DCR Rider | PUCO | CEI | Distribution | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed ROE | 9.63% |  |  |  |  |  |  |  |  |  |  |  |
Allowed debt | 48.80% |  |  |  |  |  |  |  |  |  |  |  |
Approved capital structure | 51.20% |  |  |  |  |  |  |  |  |  |  |  |
Ohio | DCR Rider | PUCO | MAIT | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed debt |  |  |  |  | 46.00% |  |  |  |  |  |  |  |
Approved capital structure |  |  |  |  | 54.00% |  |  |  |  |  |  |  |
Ohio | DCR Rider | PUCO | TE | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed debt |  |  |  |  | 45.00% |  |  |  |  |  |  |  |
Approved capital structure |  |  |  |  | 55.00% |  |  |  |  |  |  |  |
Ohio | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | PUCO | CEI | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase base distribution rate |  |  |  |  | $ 94,000 |  |  |  |  |  |  |  |
Public utilities, adjusted rate increase base distribution |  |  |  | $ 190,000 |  |  |  |  |  |  |  |  |
Ohio | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | PUCO | CEI | Distribution | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase base distribution rate | $ 8,000 |  |  |  |  |  |  |  |  |  |  |  |
Ohio | Phase Two of Grid Modernization Plan | PUCO | Ohio Companies |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Numbers of additional meters to be installed | meter |  |  |  |  |  | 1,400 |  | 700 |  |  |  |  |
Number of circuits additional automation equipment to be installed on | circuit |  |  |  |  |  |  |  | 240 |  |  |  |  |
Number of circuits additional voltage regulating equipment to be installed on | circuit |  |  |  |  |  |  |  | 220 |  |  |  |  |
Period of grid modernization plan |  |  |  |  |  | 4 years |  | 4 years |  |  |  |  |
Requested amount of capital investments |  |  |  |  |  | $ 421,000 |  | $ 626,000 |  |  |  |  |
Requested amount of operations and maintenance expenses |  |  |  |  |  |  |  | $ 144,000 |  |  |  |  |
Ohio | Rider Delivery Capital Recovery Audit Report | PUCO | Ohio Companies |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Refund to customer of pole attachment rates |  |  | $ 15 |  |  |  |  |  |  |  |  |  | $ 15
Number of minor non-compliance with requirements | requirement |  |  |  |  |  |  |  |  |  |  |  | 8 |
Number of requirements were in compliance | requirement |  |  |  |  |  |  |  |  |  |  |  | 23 |
Loss contingency, payment audit, number of payments examined | payment |  |  | 53 |  |  |  |  |  |  |  |  |  |
Loss contingency, payment audit, total payments in support of Passage of house bill |  |  | $ 75,000 |  |  |  |  |  |  |  |  |  |
Ohio | Rider Delivery Capital Recovery Audit Report | PUCO | Maximum | Ohio Companies |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, payment audit, payments in support of passage of house bill allocated to defendants |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |
Ohio | Energy Conservation, Economic Development and Job Retention | PUCO |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution amount |  | $ 6,390 |  |  |  |  |  |  |  |  |  |  |

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