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Rate Matters East Companies (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 26, 2024 | Jan. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  |  | $ 76,693.4 | $ 73,339.1
Appalachian Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  |  | 12,931.5 | 12,379.2
Indiana Michigan Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  |  | 7,629.0 | 7,411.5
Ohio Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  |  | 9,299.9 | 8,609.3
Public Service Co Of Oklahoma [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  |  | 6,112.3 | $ 5,626.5
2020-2022 Virginia Triennial Review | Appalachian Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested Annual Increase |  |  | $ 213.0 |
Requested Return on Equity |  |  | 10.60% |
Requested Annual Base Rate Increase Vegetation Management Portion |  |  | $ 47.0 |
Requested Annual Base Rate Increase Depreciation Expense Portion |  |  | 35.0 |
Settlement Agreement Annual Increase |  |  | $ 127.0 |
Settlement Agreement Return on Common Equity |  |  | 9.50% |
Michigan Power Supply Cost Recovery Reconciliation | Indiana Michigan Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
2021 Recommended Disallowance |  |  | $ 18.0 |
2021 Potential Disallowed Costs |  |  | 14.0 |
2021 OVEC ICPA Recommended Disallowance |  |  | $ 1.0 |
Ohio ESP Filings [Member] | Ohio Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Proposed ESP Return on Common Equity |  |  | 10.65% |
Ohio ESP Filings [Member] | Kentucky Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Approved Return on Common Equity |  |  | 9.70% |
ENEC Filing [Member] | Appalachian Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
2023 Alt One Annual Increase in ENEC |  |  | $ 293.0 |
2023 Alt One Current Year ENEC Increase |  |  | 89.0 |
2023 Alt One Under Recovery |  |  | 200.0 |
2023 Alt Two Annual Increase in ENEC Rates |  |  | 89.0 |
2023 Alt Two Asset Securitization |  |  | 1,900.0 |
2023 Alt Two Under Recovery |  |  | 553.0 |
2023 Alt Two Major Storm Expense Deferrals |  |  | 88.0 |
2023 Alt Two WV Amos and Mountaineer Book Value and CCR and ELG Investments |  |  | 1,200.0 |
2023 Annual Increase in ENEC Rates |  |  | 89.0 |
2023 Indiana Base Rate Case [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested Annual Increase |  |  | $ 116.0 |
Requested Return on Equity |  |  | 10.50% |
Amount Of Increased Depreciation Expense Requested |  |  | $ 41.0 |
Settlement Agreement Return on Common Equity |  |  | 9.85% |
Requested Debt Capital Structure |  |  | 48.80% |
Requested Equity Capital Structure |  |  | 51.20% |
Requested Deferred Storm Costs |  |  | $ 15.0 |
Settlement Agreement Annual Increase Step One |  |  | 28.0 |
Settlement Agreement Annual Increase Step Two |  |  | $ 34.0 |
Settlement Agreement Debt Capital Structure |  |  | 50.00% |
Settlement Agreement Equity Capital Structure |  |  | 50.00% |
Settlement Agreement Increase Related to Depreciation Expense |  |  | $ 25.0 |
Settlement Agreement Increase Related to Storm Expense |  |  | $ 11.0 |
Settlement Agreement Adjusted Equity Capital Structure |  |  | 51.20% |
2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested Annual Increase |  |  | $ 34.0 |
Requested Return on Equity |  |  | 10.50% |
Amount Of Increased Depreciation Expense Requested |  |  | $ 11.0 |
Requested Debt Capital Structure |  |  | 49.40% |
Requested Equity Capital Structure |  |  | 50.60% |
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested Annual Increase |  |  | $ 94.0 |
Requested Return on Equity |  |  | 9.90% |
Settlement Agreement Annual Increase |  |  | $ 75.0 |
Settlement Agreement Return on Common Equity |  |  | 9.75% |
Requested Annual Base Rate Storm Level Restoration Expense |  |  | $ 1.0 |
Requested Purchased Power Costs Not Recoverable Through FAC Recovery |  |  | 16.0 |
Requested Securitization Bonds Regulatory Assets Recovery |  |  | 471.0 |
Requested Securitization Bonds Plant Retirement Costs |  |  | 289.0 |
Requested Securitization Bonds Deferred Storm Costs |  |  | 79.0 |
Requested Securitization Bonds Deferred Purchased Power Expenses |  |  | 52.0 |
Requested Securitization Bonds Under Recovered Purchased Power Rider Costs |  |  | 51.0 |
Settlement Agreement Securitization Bonds Regulatory Assets Recovery |  |  | 471.0 |
Settlement Agreement Forgone Purchased Power Costs Not Recoverable Through FAC Recovery |  |  | 16.0 |
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] | Mitchell Power Plant |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  |  | $ 553.0 |
KPCo Interest in Mitchell Plant |  |  | 50.00% |
Fuel Adjustment Clause Review [Member] | Kentucky Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Purchased Power Cost Recoveries |  |  | $ 432.0 |
Subsequent Event [Member] | Michigan Power Supply Cost Recovery Reconciliation | Indiana Michigan Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
2022 Recommended Disallowance |  | $ 2.0 |  |
2022 Potential Disallowed Costs |  | 6.0 |  |
Subsequent Event [Member] | ENEC Filing [Member] | Appalachian Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Under Recovered Costs Disallowance |  | 232.0 |  |
Approved Recovery Under Recovered Costs |  | $ 321.0 |  |
Approved Carrying Charges |  | 4.00% |  |
Subsequent Event [Member] | 2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Recommended Disallowance from Staff or Intervenors |  | $ 5.0 |  |
Subsequent Event [Member] | 2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Approved Return on Common Equity |  | 9.75% |  |
Approved Net Increase in Kentucky Annual Revenues |  | $ 60.0 |  |
Reduction In Revenue Requirement For Recovery of Actual Test Year PJM Transmission Costs | $ 14.0 | 14.0 |  |
Subsequent Event [Member] | Rockport Offset Recovery [Member] | Kentucky Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested Recovery of Allowed Costs |  | 41.0 |  |
Estimated Allowed Costs Recovered Through Rider |  | 23.0 |  |
Requested Recovery of Remaining Allowed Costs Through Rider |  | 18.0 |  |
Approved Recovery of Allowed Costs Through Interim Rates | $ 18.0 |  |  |
Minimum [Member] | Fuel Adjustment Clause Review [Member] | Kentucky Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Recommended Disallowance from Staff or Intervenors |  |  | 44.0 |
Minimum [Member] | Subsequent Event [Member] | 2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Recommended Annual Base Rate Decrease |  | $ 6.0 |  |
Recommended Return on Common Equity |  | 9.70% |  |
Recommended Debt Capital Structure |  | 49.40% |  |
Recommended Equity Capital Structure |  | 48.00% |  |
Maximum [Member] | Fuel Adjustment Clause Review [Member] | Kentucky Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Recommended Disallowance from Staff or Intervenors |  |  | $ 60.0 |
Maximum [Member] | Subsequent Event [Member] | 2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Recommended Annual Base Rate Increase |  | $ 19.0 |  |
Recommended Return on Common Equity |  | 9.90% |  |
Recommended Debt Capital Structure |  | 52.00% |  |
Recommended Equity Capital Structure |  | 50.60% |  |
APCo Portion [Member] | Subsequent Event [Member] | ENEC Filing [Member] | Appalachian Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Under Recovered Costs Disallowance |  | $ 136.0 |  |
Approved Recovery Under Recovered Costs |  | $ 174.0 |  |

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