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Rate Matters Regulated Operations (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  | $ 78,860.4 |  | $ 76,693.4
Regulatory Assets, Noncurrent |  | 5,354.3 |  | 5,092.4
Asset Impairments and Other Related Charges |  | 142.5 | $ 0.0 |
Regulatory Assets, Current |  | 506.2 |  | 514.0
AEP Texas Inc. [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  | 13,374.8 |  | 12,774.0
Regulatory Assets, Noncurrent |  | 350.6 |  | 315.3
AEP Transmission Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  | 15,086.0 |  | 14,497.7
Regulatory Assets, Noncurrent |  | 1.6 |  | 3.1
Appalachian Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  | 13,253.6 |  | 12,931.5
Regulatory Assets, Noncurrent |  | 1,324.9 |  | 1,155.1
Regulatory Assets, Current |  | 150.3 |  | 155.4
Indiana Michigan Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  | 7,731.3 |  | 7,629.0
Regulatory Assets, Noncurrent |  | 589.6 |  | 406.3
Asset Impairments and Other Related Charges |  | 13.4 | 0.0 |
Regulatory Assets, Current |  | 5.7 |  | 14.8
Ohio Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  | 9,610.4 |  | 9,299.9
Regulatory Assets, Noncurrent |  | 411.2 |  | 455.0
Asset Impairments and Other Related Charges |  | 52.9 | $ 0.0 |
Public Service Co Of Oklahoma [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  | 6,294.3 |  | 6,112.3
Regulatory Assets, Noncurrent |  | 532.0 |  | 522.7
Regulatory Assets, Current |  | 132.1 |  | 118.3
Public Service Co Of Oklahoma [Member] | Northeastern Plant, Unit 3 | Generating Units Probable of Abandonment [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  | 122.8 |  |
Accelerated Depreciation Regulatory Asset |  | 173.6 |  |
Cost of Removal Regulatory Liability | [1] | $ 20.9 |  |
Expected Retirement Date | [2] | 2026 |  |
Depreciation | [3] | $ 15.1 |  |
Southwestern Electric Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  | 8,797.9 |  | 8,558.4
Regulatory Assets, Noncurrent |  | 1,124.5 |  | 1,131.8
Net Under-Recovered Fuel Costs |  | 39.0 |  |
Regulatory Assets, Current |  | 132.9 |  | 170.8
Southwestern Electric Power Co [Member] | Dolet Hills Power Station [Member] | Louisiana Jurisdiction [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Dolet Hills Prudency Disallowance |  | 14.0 |  |
Southwestern Electric Power Co [Member] | Dolet Hills Power Station and Related Fuel Operations |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Share of Net Investment in Dolet Hills Power Station |  | 80.0 |  |
Southwestern Electric Power Co [Member] | Dolet Hills Power Station and Related Fuel Operations | Arkansas |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Recovery of 2021 Dolet Hills Fuel Costs |  | 20.0 |  |
Southwestern Electric Power Co [Member] | Dolet Hills Power Station and Related Fuel Operations | Louisiana Jurisdiction [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Recovery of 2021 Dolet Hills Fuel Costs |  | 20.0 |  |
Approved Deferral of Dolet Hills Fuel Costs |  | 35.0 |  |
Recommended Disallowance from Staff or Intervenors |  | 55.0 |  |
ALJ Recommended Customer Refund |  | 55.0 |  |
ALJ Recommended Denial of Recovery for Fuel Costs Deferral |  | 35.0 |  |
Dolet Hills Fuel Disallowance |  | 11.0 |  |
Remaining Dolet Fuel Reg Asset Recovered Over Three Years |  | 24.0 |  |
Southwestern Electric Power Co [Member] | Dolet Hills Power Station and Related Fuel Operations | Texas |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Oxbow Mine Related Costs Recovery Request |  | 48.0 |  |
Southwestern Electric Power Co [Member] | Pirkey Power Plant and Related Fuel Operations |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Share of Net Investment in Pirkey Power Plant |  | 184.0 |  |
Southwestern Electric Power Co [Member] | Pirkey Power Plant and Related Fuel Operations | Texas |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Oxbow Mine Related Costs Recovery Request |  | 33.0 |  |
Southwestern Electric Power Co [Member] | Pirkey Generating Station (Unit No. 1) | Texas |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  | 68.0 |  |
Southwestern Electric Power Co [Member] | Welsh Plant Unit 1 and 3 | Generating Units Probable of Abandonment [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Net Investment |  | 344.9 |  |
Accelerated Depreciation Regulatory Asset |  | 145.4 |  |
Cost of Removal Regulatory Liability | [4] | $ 57.7 |  |
Expected Retirement Date | [5],[6] | 2028 |  |
Depreciation | [3] | $ 39.9 |  |
Southwestern Electric Power Co [Member] | Dolet Hills Power Station | Arkansas |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Asset Impairments and Other Related Charges |  | 2.0 |  |
Southwestern Electric Power Co [Member] | Dolet Hills Power Station | Texas |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Asset Impairments and Other Related Charges |  | 12.0 |  |
Regulatory Assets Pending Final Regulatory Approval [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 1,243.4 |  | 874.4
Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 72.8 |  | 64.3
Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 398.8 |  | 125.5
Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 106.0 |  | 33.2
Regulatory Assets Pending Final Regulatory Approval [Member] | Ohio Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 23.6 |  | 23.6
Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 109.2 |  | 88.7
Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 448.5 |  | 444.9
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Other Regulatory Assets Not Yet Being Recovered [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 15.1 |  | 49.8
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | February 2021 Severe Storm Fuel Costs |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent | [7] | 83.8 |  | 97.2
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Pirkey Power Plant Accelerated Depreciation |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 117.9 |  | 114.4
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Welsh Unit 1 and 3 Accelerated Depreciation |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 145.4 |  | 125.6
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] | Other Regulatory Assets Not Yet Being Recovered [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 0.8 |  | 0.6
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] | Other Regulatory Assets Not Yet Being Recovered [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 1.3 |  | 0.2
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] | Dolet Hills Power Station Accelerated Depreciation [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent | [8] | 11.8 |  | 12.0
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] | Other Regulatory Assets Not Yet Being Recovered [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 1.2 |  | 26.0
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] | February 2021 Severe Storm Fuel Costs |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent | [9] | 83.8 |  | 97.2
Regulatory Assets, Current |  | 37.0 |  | 37.0
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] | Pirkey Power Plant Accelerated Depreciation |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 117.9 |  | 114.4
Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] | Welsh Unit 1 and 3 Accelerated Depreciation |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 145.4 |  | 125.6
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Plant Retirement Costs - Asset Retirement Obligation Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent | [10] | 334.7 |  | 25.9
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Storm Related Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 395.0 |  | 408.9
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Other Regulatory Assets Not Yet Being Recovered [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 76.2 |  | 52.6
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | NOLC Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 75.3 |  | 0.0
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] | Storm Related Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 40.0 |  | 37.7
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] | Other Regulatory Assets Not Yet Being Recovered [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 13.9 |  | 11.7
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] | Texas Retail Electric Provider Bad Debt Expense |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 4.1 |  | 4.0
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] | Vegetation Management Programs |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 5.2 |  | 5.2
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | AEP Texas Inc. [Member] | Line Inspection Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 9.6 |  | 5.7
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] | Plant Retirement Costs - Asset Retirement Obligation Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent | [11] | 262.4 |  | 25.9
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] | Storm Related Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 118.1 |  | 91.5
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Appalachian Power Co [Member] | Other Regulatory Assets Not Yet Being Recovered [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 17.5 |  | 7.5
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] | Plant Retirement Costs - Asset Retirement Obligation Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent | [12] | 72.3 |  | 0.0
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] | Storm Related Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 8.0 |  | 29.7
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] | Other Regulatory Assets Not Yet Being Recovered [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 1.9 |  | 3.3
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Indiana Michigan Power Co [Member] | NOLC Costs [Member] | Indiana [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 22.5 |  | 0.0
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Ohio Power Co [Member] | Storm Related Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 23.6 |  | 23.6
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] | Storm Related Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 93.1 |  | 88.5
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] | Other Regulatory Assets Not Yet Being Recovered [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 3.0 |  | 0.2
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Public Service Co Of Oklahoma [Member] | NOLC Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 13.1 |  | 0.0
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] | Storm Related Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 30.5 |  | 56.0
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] | Other Regulatory Assets Not Yet Being Recovered [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | 18.2 |  | 13.7
Regulatory Assets Currently Not Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] | Southwestern Electric Power Co [Member] | NOLC Costs [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory Assets, Noncurrent |  | $ 39.7 |  | $ 0.0
[1] | Includes Northeastern Plant, Unit 4, which was retired in 2016. Removal of Northeastern Plant, Unit 4, will be performed with the removal of Northeastern Plant, Unit 3, after retirement.
[2] | Northeastern Plant, Unit 3 is currently being recovered through 2040.
[3] | Represents the amount of annual depreciation that has been collected from customers over the prior 12-month period.
[4] | Includes Welsh Plant, Unit 2, which was retired in 2016. Removal of Welsh Plant, Unit 2, will be performed with the removal of Welsh Plant, Units 1 and 3, after retirement.
[5] | Represents projected retirement date of coal assets, units are being evaluated for conversion to natural gas after 2028.
[6] | Unit 1 is being recovered through 2027 in the Louisiana jurisdiction and through 2037 in the Arkansas and Texas jurisdictions. Unit 3 is being recovered through 2032 in the Louisiana jurisdiction and through 2042 in the Arkansas and Texas jurisdictions.
[7] | Includes $37 million of unrecovered winter storm fuel costs recorded as a current regulatory asset as of June 30, 2024 and December 31, 2023, respectively. See the “February 2021 Severe Winter Weather Impacts in SPP” section below for additional information.
[8] | Amounts include the FERC jurisdiction
[9] | Includes $37 million of unrecovered winter storm fuel costs recorded as a current regulatory asset as of June 30, 2024 and December 31, 2023, respectively. See the “February 2021 Severe Winter Weather Impacts in SPP” section below for additional information.
[10] | See “Federal EPA’s Revised CCR Rule” section of Note 5 for additional information.
[11] | See “Federal EPA’s Revised CCR Rule” section of Note 5 for additional information.
[12] | See “Federal EPA’s Revised CCR Rule” section of Note 5 for additional information.

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