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RATE MATTERS - KPCo Rate Matters (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 29, 2025 | Aug. 31, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Jan. 31, 2025 | Feb. 29, 2024 | Jan. 31, 2024 | Nov. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2025 | Jul. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Issuances |  |  |  |  |  |  |  |  |  | $ 6,300.0 |
KPCo |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested annual base rate increase (decrease) |  | $ 96.0 |  |  |  |  |  |  |  |  |
Requested return on equity |  | 10.00% |  |  |  |  |  |  |  |  |
Requested debt capital structure |  | 53.90% |  |  |  |  |  |  |  |  |
Requested equity capital structure |  | 46.10% |  |  |  |  |  |  |  |  |
Increase in PJM transmission costs |  | $ 10.0 |  |  |  |  |  |  |  |  |
Increase due to load loss |  | 9.0 |  |  |  |  |  |  |  |  |
Requested rate increase related to depreciation rates |  | 6.0 |  |  |  |  |  |  |  |  |
KPCo | Securitization Bonds |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Issuances |  |  |  |  |  |  |  |  |  | $ 477.7 |
KPCo | Mitchell Plant |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested annual base rate increase (decrease) |  | $ 20.0 |  |  |  |  |  |  |  |  |
Jointly owned utility plant, percentage of ownership share |  |  |  |  |  |  |  |  |  | 50.00% |
Proportionate energy and capacity share |  |  | 50.00% |  |  |  |  |  |  |  |
Net Book Value |  |  |  |  |  |  |  |  |  | $ 529.0 |
KPCo | Mitchell Plant ELG investments |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Jointly owned utility plant, percentage of ownership share |  |  |  |  |  |  |  |  |  |  | 50.00%
Estimated cost to be recovered |  |  | $ 78.0 |  |  |  |  |  |  |  |
KPCo | Mitchell Plant Non-ELG Capital Investments |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated cost to be recovered |  |  | $ 60.0 |  |  |  |  |  |  |  |
WPCo | Mitchell Plant |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Jointly owned utility plant, percentage of ownership share |  |  |  |  |  |  |  |  |  | 50.00% |
WPCo | Mitchell Plant ELG investments |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportionate ownership share requested to be transferred |  |  | 50.00% |  |  |  |  |  |  |  |
WPCo | Mitchell Plant Non-ELG Capital Investments |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Jointly owned utility plant, percentage of ownership share |  |  |  |  |  |  |  |  |  |  | 50.00%
Proportionate ownership share requested to be transferred |  |  | 50.00% |  |  |  |  |  |  |  |
WPCo | Mitchell Plant ELG investments |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subsidiary, ownership percentage, parent |  |  |  |  |  |  |  |  |  |  | 100.00%
2023 Kentucky Base Rate and Securitization Case | KPCo |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested annual base rate increase (decrease) |  |  |  |  |  |  |  |  | $ 94.0 |  |
Requested return on equity |  |  |  |  |  |  |  |  | 9.90% |  |
Requested securitization bonds regulatory assets recovery |  |  |  |  |  |  |  |  | $ 471.0 |  |
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 | $ 14.0 |  |  |  |
Order entered in mandated period |  |  |  |  | 30 days |  |  |  |  |  |
Request to defer transmission costs, amount denied |  |  |  | $ 16.0 |  |  |  |  |  |  |
Regulatory assets expected to be recovered through securitization |  |  | $ 500.0 |  |  |  |  |  |  |  |
2023 Kentucky Base Rate and Securitization Case | KPCo | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recovery of costs, approved | $ 16.0 |  |  |  |  |  |  |  |  |  |
Recovery of costs, period | 22 months |  |  |  |  |  |  |  |  |  |
2023 Kentucky Base Rate and Securitization Case | KPCo | Securitization Bonds |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Issuances |  |  | 478.0 |  |  |  |  |  |  |  |
Non-utility issuance costs |  |  | 6.0 |  |  |  |  |  |  |  |
Securitized offset for net present value of return on ADIT |  |  | 29.0 |  |  |  |  |  |  |  |
2023 Kentucky Base Rate and Securitization Case | KPCo | Plant Retirement Costs – Asset Retirement Obligation Costs |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets expected to be recovered through securitization |  |  | 311.0 |  |  |  |  |  |  |  |
2023 Kentucky Base Rate and Securitization Case | KPCo | Storm-Related Costs |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets expected to be recovered through securitization |  |  | 79.0 |  |  |  |  |  |  |  |
2023 Kentucky Base Rate and Securitization Case | KPCo | Under-Recovered Purchased Power Rider Costs |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets expected to be recovered through securitization |  |  | 56.0 |  |  |  |  |  |  |  |
2023 Kentucky Base Rate and Securitization Case | KPCo | Deferred Purchased Power Expenses |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets expected to be recovered through securitization |  |  | 51.0 |  |  |  |  |  |  |  |
2023 Kentucky Base Rate and Securitization Case | KPCo | Issuance Expenses |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets expected to be recovered through securitization |  |  | $ 3.0 |  |  |  |  |  |  |  |
2023 Kentucky Base Rate and Securitization Case | KPCo | Mitchell Plant |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Jointly owned utility plant, percentage of ownership share |  |  |  |  |  |  |  |  | 50.00% |  |

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