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REGULATORY MATTERS - Ohio (Details) - PUCO meter in Thousands, $ in Thousands |  |  |  |  |  |  |  | 9 Months Ended |  |  |
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Jul. 31, 2024 USD ($) | Jun. 14, 2024 | May 31, 2024 USD ($) | Apr. 12, 2024 USD ($) meter | Apr. 05, 2023 | Jul. 15, 2022 USD ($) meter circuit | Jun. 01, 2016 USD ($) | Sep. 30, 2024 USD ($) payment | May 15, 2024 USD ($) | Sep. 13, 2021 requirement | Aug. 06, 2021 USD ($)
The Ohio Companies | Minimum |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved period of rate plan |  |  |  |  | 8 years |  |  |  |  |  |
ESP V | The Ohio Companies |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved bill assistance contribution amount |  |  |  |  |  |  |  |  | $ 32,500 |  |
Requested reduced rate term |  | 3 years |  |  |  |  |  |  |  |  |
OHIO |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proposed goal to reduce CO2 pollution (percent) |  |  |  |  |  |  | 90.00% |  |  |  |
OHIO | Energy Conservation, Economic Development and Job Retention |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution amount |  |  |  |  |  |  | $ 51,000 |  |  |  |
OHIO | Delivery Capital Recovery Rider |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual revenue cap for rider for years three through six |  |  |  |  |  |  | $ 15,000 |  |  |  |
OHIO | Delivery Capital Recovery Rider | Distribution Segment | CEI |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved ROE |  |  | 10.80% |  |  |  |  |  |  |  |
Capital structure, debt |  |  | 44.00% |  |  |  |  |  |  |  |
Capital structure, equity |  |  | 56.00% |  |  |  |  |  |  |  |
OHIO | Delivery Capital Recovery Rider | Distribution Segment | TE |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital structure, debt |  |  | 45.00% |  |  |  |  |  |  |  |
Capital structure, equity |  |  | 55.00% |  |  |  |  |  |  |  |
OHIO | Delivery Capital Recovery Rider | Distribution Segment | OE |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital structure, debt |  |  | 46.00% |  |  |  |  |  |  |  |
Capital structure, equity |  |  | 54.00% |  |  |  |  |  |  |  |
OHIO | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | Distribution Segment | CEI |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase base distribution rate |  |  | $ 94,000 |  |  |  |  |  |  |  |
Public utilities, adjusted rate increase base distribution | $ 190,000 |  |  |  |  |  |  |  |  |  |
OHIO | Phase Two of Grid Modernization Plan | The 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 DCR Audit Report | The Ohio Companies |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Refund to customer of pole attachment sates |  |  |  |  |  |  |  | $ 15 |  |  | $ 15
Public utilities, number of audit examined payments | payment |  |  |  |  |  |  |  | 53 |  |  |
Public utilities, audit examined payment amount |  |  |  |  |  |  |  | $ 75,000 |  |  |
Number of requirements with minor non-compliance | requirement |  |  |  |  |  |  |  |  |  | 8 |
Number of requirements | requirement |  |  |  |  |  |  |  |  |  | 23 |
OHIO | Rider DCR Audit Report | The Ohio Companies | Maximum |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Payment Audit, Payments In Support Of Passage Of House Bill Allocated To Defendants |  |  |  |  |  |  |  | $ 5,000 |  |  |

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