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Rate Matters East Companies (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |  |
Net Property, Plant and Equipment |  | $ 75,821.1 | $ 73,339.1
AEP Transmission Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Net Property, Plant and Equipment |  | 14,318.9 | 13,339.9
Appalachian Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Net Property, Plant and Equipment |  | 12,825.1 | 12,379.2
Indiana Michigan Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Net Property, Plant and Equipment |  | 7,535.7 | 7,411.5
Ohio Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Net Property, Plant and Equipment |  | 9,160.0 | $ 8,609.3
ENEC Filing | Appalachian Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
2021 Requested Increase in ENEC Revenues |  | 73.0 |
2021 Cumulative ENEC Under Recovery |  | 55.0 |
2021 Projected ENEC Cost Incease |  | 18.0 |
2021 Approved ENEC Rate Increase |  | 7.0 |
2021 Approved Reduction in ENEC Projected Costs |  | 48.0 |
2022 Requested Increase in ENEC Rates |  | 155.0 |
2022 Requested Increase in ENEC Rates Second Filing |  | 297.0 |
2022 Approved Projected ENEC Rate Increase |  | 31.0 |
2022 Approved Overall ENEC Rate Increase |  | 93.0 |
2022 Recommended ENEC Under-Recovery Disallowance |  | 83.0 |
2022 Recommended Increase in ENEC Rates |  | 13.0 |
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 |
Opinion Coal Fired Plants Capacity Factor |  | 69.00% |
Opinion Recommended Disallowance Factor |  | 52.90% |
September 2022 Cumulative ENEC Under Recovery Balance |  | $ 430.0 |
Potential Cumulative ENEC Under Recovery Disallowance |  | 285.0 |
2023 Staff and Intervenor Recommended Under Recovery |  | 262.0 |
2023 Approved Annual Increase in ENEC Rates |  | $ 89.0 |
2023 Intervenor Recommended Share of OSS Revenues with Customers |  | 75.00% |
ENEC Filing | Appalachian Power Co [Member] | Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
2023 Intervenor Recommended Under Recovery Disallowance | $ 553.0 |  |
Michigan Power Supply Cost Recovery Reconciliation | Indiana Michigan Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Recommended Disallowance |  | $ 18.0 |
Potential Disallowed Costs |  | 14.0 |
OVEC ICPA Recommended Disallowance |  | $ 1.0 |
2020-2022 Virginia Triennial Review [Member] | Appalachian Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Return on Equity |  | 10.60% |
Staff and Intervenor Recommended Annual Increase |  | $ 127.0 |
Requested Annual Base Rate Increase |  | 213.0 |
Requested Annual Base Rate Increase Vegetation Management Portion |  | 47.0 |
Requested annual Base Rate Incresae Depreciation Expense Portion |  | $ 35.0 |
Staff and Intervenor Recommended Return on Equity |  | 9.50% |
Staff and Intervenor Recommended Storm Costs Regulatory Asset |  | $ 50.0 |
Ohio ESP Filings [Member] | Ohio Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved Return on Common Equity |  | 9.70% |
Proprosed ESP Return on Common Equity |  | 10.65% |
Fuel Adjustment Clause Purchased Power Limitation [Member] | Kentucky Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Purchased Power Costs Not Recoverable Through FAC Recovery |  | $ 12.0 |
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Return on Equity |  | 9.90% |
Requested Annual Base Rate Increase |  | $ 94.0 |
Requested Purchased Power Costs Not Recoverable Through FAC Recovery |  | 16.0 |
Requested Annual Base Rate Storm Level Restoration Expense |  | 1.0 |
Requested Securitization Bonds Regulatory Assets Recovery |  | 471.0 |
Requested Securitization Bonds Plant Recovery 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 |
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] | Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Intervenor Recommended Annual Increase | 63.0 |  |
Intervenor Recommended Opposition to Tax Related Regulatory Asset | 33.0 |  |
Intervenor Recommended Opposition to Purchased Power Recovery | 16.0 |  |
Intervenor Recommended Opposition to Return on Retirement Costs | $ 42.0 |  |
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 Increase Related to Annual Depreciation Expense |  | $ 41.0 |
Requested Deferred Storm Costs |  | $ 15.0 |
Requested Debt Capital Structure |  | 48.80% |
Requested 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 Increase Related to Annual Depreciation Expense |  | $ 11.0 |
Requested Debt Capital Structure |  | 49.40% |
Requested Equity Capital Structure |  | 50.60% |
Minimum [Member] | ENEC Filing | Appalachian Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
2023 Staff and Intervenor Recommended Carrying Charges |  | 2.00% |
Minimum [Member] | 2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] | Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Intervenor Recommended Return on Equity | 9.30% |  |
Maximum [Member] | ENEC Filing | Appalachian Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
2023 Staff and Intervenor Recommended Carrying Charges |  | 4.00% |
Maximum [Member] | 2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] | Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Intervenor Recommended Return on Equity | 9.70% |  |

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