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RATE MATTERS - KPCo Rate Matters (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2025 | Nov. 30, 2024 | Feb. 29, 2024 | Feb. 26, 2024 | Jan. 31, 2024 | Dec. 31, 2023 | Nov. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2024
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  | $ 564.3 |  |  | $ 564.3 | $ 714.9
2023 Kentucky Base Rate and Securitization Case | KPCo |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested annual increase |  |  |  |  |  |  |  | $ 94.0 |  |
Requested return on equity |  |  |  |  |  |  |  | 9.90% |  |
Requested securitization bonds regulatory assets recovery |  |  |  |  |  |  |  | $ 471.0 |  |
Kpco interest in mitchell plant |  |  |  |  |  |  |  | 50.00% |  |
Property, plant and equipment, net |  |  |  |  |  |  |  |  |  | $ 547.0
Settlement agreement annual increase |  |  |  |  |  |  | $ 75.0 |  |  |
Settlement agreement return on common equity |  |  |  |  |  |  | 9.75% |  |  |
Settlement agreement securitization bonds regulatory assets recovery |  |  |  |  |  |  | $ 471.0 |  |  |
Approved net increase in Kentucky annual revenues |  |  |  |  | $ 60.0 |  |  |  |  |
Approved return on equity |  |  |  |  | 9.75% |  |  |  |  |
Reduction in revenue requirement for recovery of actual test year pjm transmission costs |  |  |  | $ 14.0 | $ 14.0 |  |  |  |  |
Regulatory assets expected to be recovered through securitization |  |  |  |  | 491.0 |  |  |  |  |
Securitized plant retirement costs |  |  |  |  | 303.0 |  |  |  |  |
Securitized deferred storm costs |  |  |  |  | 79.0 |  |  |  |  |
Securitized purchased power expenses |  |  |  |  | 50.0 |  |  |  |  |
Securitized under recovered rider costs |  |  |  |  | 57.0 |  |  |  |  |
Securitized deferred issuance related expenses |  |  |  |  | 2.0 |  |  |  |  |
2023 Kentucky Base Rate and Securitization Case | KPCo | Subsequent Event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Reduction in revenue requirement for recovery of actual test year pjm transmission costs | $ 14.0 |  |  |  |  |  |  |  |  |
Order entered in mandated period | 30 days |  |  |  |  |  |  |  |  |
Fuel Adjustment Clause Review | KPCo |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Review period |  |  |  |  |  | 2 years |  |  |  |
Purchased power cost recoveries |  |  |  |  |  | $ 432.0 |  |  |  |
Customer rate credits |  | $ 17.0 |  |  |  |  |  |  |  |
Fuel Adjustment Clause Review | KPCo | Minimum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Recommended disallowance from staff or intervenors |  |  |  |  |  | 44.0 |  |  |  |
Fuel Adjustment Clause Review | KPCo | Maximum |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Recommended disallowance from staff or intervenors |  |  |  |  |  | $ 60.0 |  |  |  |
Rockport Offset Recovery | KPCo |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested recovery of allowed costs |  |  |  |  | $ 41.0 |  |  |  |  |
Estimated allowed costs recovered through rider |  |  | $ 18.0 |  |  |  |  |  | $ 23.0 |

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