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Property, Plant and Equipment | 9 Months Ended
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Sep. 30, 2024
Property, Plant and Equipment | PROPERTY, PLANT AND EQUIPMENT The disclosures in this note apply to all Registrants except AEPTCo. Asset Retirement Obligations The Registrants record ARO in accordance with the accounting guidance for “Asset Retirement and Environmental Obligations” for legal obligations for asbestos removal and for the retirement of certain ash disposal facilities, wind farms, solar farms and certain coal mining facilities. The table below summarizes significant changes to the Registrants ARO recorded in 2024 and should be read in conjunction with the Property, Plant and Equipment note within the 2023 Annual Report. In April 2024, the Federal EPA finalized revisions to the CCR Rule to expand the scope of the rule to include inactive impoundments at inactive facilities as well as to establish requirements for currently exempt solid waste management units that involve the direct placement of CCR on the land. In the second quarter of 2024, AEP evaluated the applicability of the rule to current and former plant sites and incurred ARO liabilities of $602 million and revised cash flow estimates by an additional $72 million based on initial cost estimates. See the “Federal EPA’s Revised CCR Rule” section of Note 5 for additional information. The following is a reconciliation of the aggregate carrying amounts of ARO by registrant:
Company |  | ARO as of December 31, 2023 |  | Accretion Expense |  | Liabilities Incurred |  | Liabilities Settled |  | Revisions in Cash Flow Estimates (a) |  | ARO as of September 30, 2024
|  | (in millions)
AEP(b)(c)(d)(e)(f)(g) |  | $ | 3,031.2 |  |  | $ | 97.2 |  |  | $ | 606.0 |  |  | $ | (80.3) |  |  | $ | 122.9 |  |  | $ | 3,777.0 |
AEP Texas (b)(e) |  | 4.5 |  |  | 0.2 |  |  | — |  |  | (0.8) |  |  | — |  |  | 3.9 |
APCo (b)(e) |  | 464.0 |  |  | 17.6 |  |  | 247.1 |  |  | (14.2) |  |  | 97.2 |  |  | 811.7 |
I&M (b)(c)(e) |  | 2,106.0 |  |  | 59.1 |  |  | 85.7 |  |  | (1.9) |  |  | — |  |  | 2,248.9 |
OPCo (b)(e) |  | 2.1 |  |  | 0.6 |  |  | 52.9 |  |  | (0.1) |  |  | — |  |  | 55.5 |
PSO (b)(e)(g) |  | 84.2 |  |  | 4.1 |  |  | 33.7 |  |  | (1.1) |  |  | — |  |  | 120.9 |
SWEPCo (b)(d)(e)(g) |  | 281.6 |  |  | 10.8 |  |  | 23.8 |  |  | (54.2) |  |  | 19.9 |  |  | 281.9 |
(a)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. (b)Includes ARO related to ash disposal facilities. (c)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. (d)Includes ARO related to Sabine and DHLC. (e)Includes ARO related to asbestos removal. (f)Includes ARO related to solar farms. (g)Includes ARO related to wind farms.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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