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v3.24.3

Property, Plant and Equipment (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Asset Retirement Obligations (ARO) |  |  |
Beginning Balance | [1],[2],[3],[4],[5],[6] | $ 3,031.2 |
Accretion Expense | [1],[2],[3],[4],[5],[6] | 97.2 |
Liabilities Incurred | [1],[2],[3],[4],[5],[6] | 606.0 |
Liabilities Settled | [1],[2],[3],[4],[5],[6] | (80.3) |
Asset Retirement Obligation, Revision of Estimate | [1],[2],[3],[4],[5],[6],[7] | 122.9 |
Ending Balance | [1],[2],[3],[4],[5],[6] | 3,777.0 |
CCR Rule Revision |  |  |
Asset Retirement Obligations (ARO) |  |  |
Liabilities Incurred |  | 602.0 |
Asset Retirement Obligation, Revision of Estimate |  | 72.0 |
AEP Texas Inc. [Member] |  |  |
Asset Retirement Obligations (ARO) |  |  |
Beginning Balance | [3],[4] | 4.5 |
Accretion Expense | [3],[4] | 0.2 |
Liabilities Incurred | [3],[4] | 0.0 |
Liabilities Settled | [3],[4] | (0.8) |
Asset Retirement Obligation, Revision of Estimate | [3],[4],[7] | 0.0 |
Ending Balance | [3],[4] | 3.9 |
Appalachian Power Co [Member] |  |  |
Asset Retirement Obligations (ARO) |  |  |
Beginning Balance | [3],[4] | 464.0 |
Accretion Expense | [3],[4] | 17.6 |
Liabilities Incurred | [3],[4] | 247.1 |
Liabilities Settled | [3],[4] | (14.2) |
Asset Retirement Obligation, Revision of Estimate | [3],[4],[7] | 97.2 |
Ending Balance | [3],[4] | 811.7 |
Indiana Michigan Power Co [Member] |  |  |
Asset Retirement Obligations (ARO) |  |  |
Beginning Balance | [3],[4],[5] | 2,106.0 |
Accretion Expense | [3],[4],[5] | 59.1 |
Liabilities Incurred | [3],[4],[5] | 85.7 |
Liabilities Settled | [3],[4],[5] | (1.9) |
Asset Retirement Obligation, Revision of Estimate | [3],[4],[5],[7] | 0.0 |
Ending Balance | [3],[4],[5] | 2,248.9 |
Public Service Co Of Oklahoma [Member] |  |  |
Asset Retirement Obligations (ARO) |  |  |
Beginning Balance | [1],[3],[4] | 84.2 |
Accretion Expense | [1],[3],[4] | 4.1 |
Liabilities Incurred | [1],[3],[4] | 33.7 |
Liabilities Settled | [1],[3],[4] | (1.1) |
Asset Retirement Obligation, Revision of Estimate | [1],[3],[4],[7] | 0.0 |
Ending Balance | [1],[3],[4] | 120.9 |
Southwestern Electric Power Co [Member] |  |  |
Asset Retirement Obligations (ARO) |  |  |
Beginning Balance | [1],[2],[3],[4] | 281.6 |
Accretion Expense | [1],[2],[3],[4] | 10.8 |
Liabilities Incurred | [1],[2],[3],[4] | 23.8 |
Liabilities Settled | [1],[2],[3],[4] | (54.2) |
Asset Retirement Obligation, Revision of Estimate | [1],[2],[3],[4],[7] | 19.9 |
Ending Balance | [1],[2],[3],[4] | 281.9 |
Ohio Power Co [Member] |  |  |
Asset Retirement Obligations (ARO) |  |  |
Beginning Balance | [3],[4] | 2.1 |
Accretion Expense | [3],[4] | 0.6 |
Liabilities Incurred | [3],[4] | 52.9 |
Liabilities Settled | [3],[4] | (0.1) |
Asset Retirement Obligation, Revision of Estimate | [3],[4],[7] | 0.0 |
Ending Balance | [3],[4] | 55.5 |
Cook plant | Indiana Michigan Power Co [Member] |  |  |
Property, Plant and Equipment (Textuals) |  |  |
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant |  | $ 2,100.0 | $ 2,100.0
[1] | Includes ARO related to wind farms.
[2] | Includes ARO related to Sabine and DHLC.
[3] | Includes ARO related to ash disposal facilities.
[4] | Includes ARO related to asbestos removal.
[5] | Includes ARO related to nuclear decommissioning costs for the Cook Plant of $2.1 billion and $2.1 billion as of September 30, 2024 and December 31, 2023, respectively.
[6] | Includes ARO related to solar farms.
[7] | Unless discussed above, primarily related to ash ponds, landfills and mine reclamation, generally due to changes in estimated closure area, volumes and/or unit costs.

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481999/410-20-25-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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