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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment |
December 31, 2023 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo |
|  | (in millions) |
Regulated Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generation |  | $ | 23,862.7 |  | (a) | $ | — |  |  | $ | — |  |  | $ | 7,041.3 |  |  | $ | 5,588.7 |  |  | $ | — |  |  | $ | 2,695.5 |  |  | $ | 4,790.7 |  | (a)
Transmission |  | 35,903.6 |  |  | 6,812.6 |  |  | 13,723.9 |  |  | 4,711.8 |  |  | 1,906.4 |  |  | 3,395.1 |  |  | 1,228.3 |  |  | 2,660.6 |  |
Distribution |  | 28,989.9 |  |  | 5,798.8 |  |  | — |  |  | 5,176.6 |  |  | 3,254.0 |  |  | 6,839.4 |  |  | 3,450.8 |  |  | 2,824.1 |  |
Other |  | 5,986.1 |  |  | 1,142.9 |  |  | 501.2 |  |  | 943.7 |  |  | 856.8 |  |  | 1,114.4 |  |  | 502.7 |  |  | 544.1 |  |
CWIP |  | 5,480.6 |  | (a) | 904.6 |  |  | 1,563.7 |  |  | 709.2 |  |  | 294.1 |  |  | 654.0 |  |  | 313.7 |  |  | 555.8 |  | (a)
Less: Accumulated Depreciation |  | 24,093.8 |  |  | 1,886.7 |  |  | 1,291.4 |  |  | 5,684.0 |  |  | 4,353.7 |  |  | 2,712.7 |  |  | 2,083.6 |  |  | 2,840.8 |  |
Total Regulated Property, Plant and Equipment - Net |  | 76,129.1 |  |  | 12,772.2 |  |  | 14,497.4 |  |  | 12,898.6 |  |  | 7,546.3 |  |  | 9,290.2 |  |  | 6,107.4 |  |  | 8,534.5 |  |
Nonregulated Property, Plant and Equipment - Net |  | 564.3 |  |  | 1.8 |  |  | 0.3 |  |  | 32.9 |  |  | 82.7 |  |  | 9.7 |  |  | 4.9 |  |  | 23.9 |  |
Total Property, Plant and Equipment - Net |  | $ | 76,693.4 |  |  | $ | 12,774.0 |  |  | $ | 14,497.7 |  |  | $ | 12,931.5 |  |  | $ | 7,629.0 |  |  | $ | 9,299.9 |  |  | $ | 6,112.3 |  |  | $ | 8,558.4 |  |
December 31, 2022 |  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo |
|  | (in millions) |
Regulated Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generation |  | $ | 23,759.7 |  | (a) | $ | — |  |  | $ | — |  |  | $ | 6,776.8 |  |  | $ | 5,534.6 |  |  | $ | — |  |  | $ | 2,394.8 |  |  | $ | 5,476.2 |  | (a)
Transmission |  | 33,221.7 |  |  | 6,301.5 |  |  | 12,335.4 |  |  | 4,482.8 |  |  | 1,842.2 |  |  | 3,198.6 |  |  | 1,164.4 |  |  | 2,479.8 |  |
Distribution |  | 27,138.8 |  |  | 5,312.8 |  |  | — |  |  | 4,933.0 |  |  | 3,024.7 |  |  | 6,450.3 |  |  | 3,216.4 |  |  | 2,659.6 |  |
Other |  | 5,528.9 |  |  | 1,020.4 |  |  | 476.6 |  |  | 849.2 |  |  | 796.1 |  |  | 1,040.6 |  |  | 466.0 |  |  | 582.6 |  |
CWIP |  | 4,776.4 |  | (a) | 805.2 |  |  | 1,554.7 |  |  | 705.3 |  |  | 253.0 |  |  | 474.3 |  |  | 219.3 |  |  | 369.5 |  | (a)
Less: Accumulated Depreciation |  | 23,118.0 |  |  | 1,759.5 |  |  | 1,027.1 |  |  | 5,397.3 |  |  | 4,117.8 |  |  | 2,564.3 |  |  | 1,839.4 |  |  | 3,314.8 |  |
Total Regulated Property, Plant and Equipment - Net |  | 71,307.5 |  |  | 11,680.4 |  |  | 13,339.6 |  |  | 12,349.8 |  |  | 7,332.8 |  |  | 8,599.5 |  |  | 5,621.5 |  |  | 8,252.9 |  |
Nonregulated Property, Plant and Equipment - Net |  | 2,031.6 |  |  | 1.2 |  |  | 0.3 |  |  | 29.4 |  |  | 78.7 |  |  | 9.8 |  |  | 5.0 |  |  | 9.3 |  |
Total Property, Plant and Equipment - Net |  | $ | 73,339.1 |  |  | $ | 11,681.6 |  |  | $ | 13,339.9 |  |  | $ | 12,379.2 |  |  | $ | 7,411.5 |  |  | $ | 8,609.3 |  |  | $ | 5,626.5 |  |  | $ | 8,262.2 |  |
(a)AEP and SWEPCo’s regulated generation and regulated CWIP include amounts related to SWEPCo’s Arkansas jurisdictional share of the Turk Plant.
Depreciation, Depletion and Amortization - Regulated |
AEP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2023 |  | 2022 |  | 2021
Functional Class of Property |  | Annual Composite Depreciation Rate Ranges |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate Ranges |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate Ranges |  | Depreciable Life Ranges
|  |  |  |  |  | (in years) |  |  |  |  |  | (in years) |  |  |  |  |  | (in years)
Generation |  | 2.7% | - | 4.7% |  | 20 | - | 162 |  | 2.7% | - | 7.6% |  | 20 | - | 132 |  | 2.7% | - | 7.8% |  | 20 | - | 132
Transmission |  | 2.0% | - | 2.7% |  | 15 | - | 78 |  | 2.0% | - | 2.7% |  | 24 | - | 75 |  | 2.0% | - | 2.6% |  | 15 | - | 75
Distribution |  | 2.9% | - | 3.6% |  | 7 | - | 85 |  | 2.7% | - | 3.6% |  | 7 | - | 78 |  | 2.8% | - | 3.6% |  | 7 | - | 80
Other |  | 3.8% | - | 9.1% |  | 5 | - | 75 |  | 3.1% | - | 14.4% |  | 5 | - | 75 |  | 3.0% | - | 12.5% |  | 5 | - | 75
AEP Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2023 |  | 2022 |  | 2021
Functional Class of Property |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges
|  |  |  | (in years) |  |  |  | (in years) |  |  |  | (in years)
Transmission |  | 2.2% |  | 50 | - | 75 |  | 2.2% |  | 50 | - | 75 |  | 2.2% |  | 50 | - | 75
Distribution |  | 2.9% |  | 7 | - | 70 |  | 2.9% |  | 7 | - | 70 |  | 2.9% |  | 7 | - | 70
Other |  | 6.0% |  | 5 | - | 50 |  | 6.2% |  | 5 | - | 50 |  | 5.8% |  | 5 | - | 50
AEPTCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2023 |  | 2022 |  | 2021
Functional Class of Property |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges
|  |  |  | (in years) |  |  |  | (in years) |  |  |  | (in years)
Transmission |  | 2.6% |  | 24 | - | 78 |  | 2.6% |  | 24 | - | 75 |  | 2.5% |  | 24 | - | 75
Other |  | 7.0% |  | 5 | - | 58 |  | 6.6% |  | 5 | - | 56 |  | 6.7% |  | 5 | - | 56
APCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2023 |  | 2022 |  | 2021
Functional Class of Property |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges
|  |  |  | (in years) |  |  |  | (in years) |  |  |  | (in years)
Generation |  | 3.3% |  | 35 | - | 162 |  | 3.6% |  | 35 | - | 118 |  | 3.6% |  | 35 | - | 118
Transmission |  | 2.3% |  | 15 | - | 78 |  | 2.2% |  | 24 | - | 75 |  | 2.1% |  | 15 | - | 75
Distribution |  | 3.6% |  | 12 | - | 60 |  | 3.6% |  | 12 | - | 57 |  | 3.5% |  | 12 | - | 57
Other |  | 7.4% |  | 5 | - | 55 |  | 7.3% |  | 5 | - | 55 |  | 8.5% |  | 5 | - | 55
I&M |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2023 |  | 2022 |  | 2021
Functional Class of Property |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges
|  |  |  | (in years) |  |  |  | (in years) |  |  |  | (in years)
Generation |  | 4.7% |  | 20 | - | 132 |  | 4.9% |  | 20 | - | 132 |  | 4.7% |  | 20 | - | 132
Transmission |  | 2.5% |  | 44 | - | 67 |  | 2.5% |  | 44 | - | 67 |  | 2.4% |  | 45 | - | 70
Distribution |  | 2.9% |  | 14 | - | 71 |  | 3.1% |  | 14 | - | 71 |  | 3.4% |  | 14 | - | 71
Other |  | 9.1% |  | 5 | - | 45 |  | 10.1% |  | 5 | - | 45 |  | 9.0% |  | 5 | - | 51
OPCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2023 |  | 2022 |  | 2021
Functional Class of Property |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges
|  |  |  | (in years) |  |  |  | (in years) |  |  |  | (in years)
Transmission |  | 2.3% |  | 39 | - | 60 |  | 2.3% |  | 39 | - | 60 |  | 2.3% |  | 39 | - | 60
Distribution |  | 3.1% |  | 11 | - | 70 |  | 2.7% |  | 11 | - | 70 |  | 2.9% |  | 11 | - | 70
Other |  | 6.4% |  | 5 | - | 50 |  | 6.1% |  | 5 | - | 50 |  | 6.1% |  | 5 | - | 50
PSO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2023 |  | 2022 |  | 2021
Functional Class of Property |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges
|  |  |  | (in years) |  |  |  | (in years) |  |  |  | (in years)
Generation |  | 3.0% |  | 25 | - | 75 |  | 3.1% |  | 30 | - | 75 |  | 2.8% |  | 30 | - | 75
Transmission |  | 2.6% |  | 41 | - | 75 |  | 2.5% |  | 42 | - | 75 |  | 2.4% |  | 42 | - | 75
Distribution |  | 2.9% |  | 15 | - | 85 |  | 2.9% |  | 15 | - | 78 |  | 2.9% |  | 15 | - | 78
Other |  | 6.8% |  | 5 | - | 58 |  | 6.8% |  | 5 | - | 56 |  | 6.1% |  | 5 | - | 56
SWEPCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2023 |  | 2022 |  | 2021
Functional Class of Property |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate |  | Depreciable Life Ranges
|  |  |  | (in years) |  |  |  | (in years) |  |  |  | (in years)
Generation |  | 2.9% |  | 30 | - | 65 |  | 2.7% |  | 30 | - | 65 |  | 2.7% |  | 30 | - | 65
Transmission |  | 2.2% |  | 46 | - | 70 |  | 2.3% |  | 44 | - | 70 |  | 2.4% |  | 49 | - | 74
Distribution |  | 2.9% |  | 7 | - | 75 |  | 2.9% |  | 15 | - | 75 |  | 2.8% |  | 15 | - | 80
Other |  | 8.5% |  | 5 | - | 58 |  | 9.0% |  | 5 | - | 57 |  | 8.6% |  | 5 | - | 58
Depreciation, Depletion and Amortization - Unregulated |
|  | 2023 |  | 2022 |  | 2021 |
Functional Class of Property |  | Annual Composite Depreciation Rate Ranges |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate Ranges |  | Depreciable Life Ranges |  | Annual Composite Depreciation Rate Ranges |  | Depreciable Life Ranges |
|  |  |  |  |  | (in years) |  |  |  |  |  | (in years) |  |  |  |  |  | (in years) |
Generation |  | 4.8% | - | 6.7% |  | 10 | - | 61 |  | 3.8% | - | 8.7% |  | 3 | - | 61 |  | 3.8% | - | 10.4% |  | 10 | - | 59 |
Transmission |  | 2.5% |  | 62 |  | 2.8% |  | 10 | - | 62 |  | 2.6% |  | 30 | - | 40 |
Distribution |  | NA |  | NA |  | NA |  | NA |  | NA |  | NA |
Other |  | 10.6% |  | 5 | - | 35 | (a) | 25.2% |  | 5 | - | 35 | (a) | 16.5% |  | 5 | - | 35 | (a)
(a)In 2020, management announced plans to retire the Pirkey Plant in 2023 and the related depreciable lives have been adjusted accordingly. Pirkey Plant was retired in March 2023. See "Coal-Fired Generation Plants" of Note 5 for additional information. NA Not applicable.
Asset Retirement Obligation (ARO) |
Company |  | ARO as of December 31, 2022 |  | Accretion Expense |  | Liabilities Incurred |  | Liabilities Settled |  | Revisions in Cash Flow Estimates (a) |  | ARO as of December 31, 2023
|  | (in millions)
AEP(b)(c)(d)(e)(f)(g) |  | $ | 2,943.6 |  |  | $ | 116.3 |  |  | $ | 38.9 |  |  | $ | (130.6) |  |  | $ | 63.0 |  |  | $ | 3,031.2 |
AEP Texas (b)(e) |  | 4.5 |  |  | 0.2 |  |  | — |  |  | (0.3) |  |  | 0.1 |  |  | 4.5 |
APCo (b)(e) |  | 427.7 |  |  | 16.8 |  |  | 16.1 |  |  | (23.1) |  |  | 26.5 |  |  | 464.0 |
I&M (b)(c)(e) |  | 2,028.1 |  |  | 74.8 |  |  | 4.8 |  |  | (3.7) |  |  | 2.0 |  |  | 2,106.0 |
OPCo (e) |  | 5.0 |  |  | 0.2 |  |  | — |  |  | (3.1) |  |  | — |  |  | 2.1 |
PSO (b)(e)(g) |  | 75.7 |  |  | 4.7 |  |  | 5.8 |  |  | (1.2) |  |  | (0.8) |  |  | 84.2 |
SWEPCo (b)(d)(e)(g) |  | 280.9 |  |  | 13.7 |  |  | 7.5 |  |  | (55.0) |  |  | 34.5 |  |  | 281.6 |
Company |  | ARO as of December 31, 2021 |  | Accretion Expense |  | Liabilities Incurred |  | Liabilities Settled |  | Revisions in Cash Flow Estimates (a) |  | ARO as of December 31, 2022
|  | (in millions)
AEP (b)(c)(d)(e)(f)(g) |  | $ | 2,741.7 |  |  | $ | 111.2 |  |  | $ | 37.4 |  |  | $ | (47.0) |  |  | $ | 100.3 |  |  | $ | 2,943.6 |
AEP Texas (b)(e) |  | 4.4 |  |  | 0.3 |  |  | — |  |  | (0.2) |  |  | — |  |  | 4.5 |
APCo (b)(e) |  | 404.6 |  |  | 15.8 |  |  | 3.0 |  |  | (12.7) |  |  | 17.0 |  |  | 427.7 |
I&M (b)(c)(e) |  | 1,946.3 |  |  | 71.5 |  |  | 3.2 |  |  | (0.6) |  |  | 7.7 |  |  | 2,028.1 |
OPCo (e) |  | 1.9 |  |  | 0.2 |  |  | 3.0 |  |  | (0.1) |  |  | — |  |  | 5.0 |
PSO (b)(e)(g) |  | 57.6 |  |  | 4.1 |  |  | 12.8 |  |  | (0.7) |  |  | 1.9 |  |  | 75.7 |
SWEPCo (b)(d)(e)(g) |  | 222.7 |  |  | 11.9 |  |  | 15.4 |  |  | (25.8) |  |  | 56.7 |  |  | 280.9 |
(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 $2.11 billion and $2 billion as of December 31, 2023 and 2022, 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.
Allowance For Equity Funds Used During Construction |
|  | Years Ended December 31,
Company |  | 2023 |  | 2022 |  | 2021
|  | (in millions)
AEP |  | $ | 174.9 |  |  | $ | 133.7 |  |  | $ | 139.7 |
AEP Texas |  | 28.4 |  |  | 19.7 |  |  | 21.5 |
AEPTCo |  | 83.2 |  |  | 70.7 |  |  | 67.2 |
APCo |  | 11.9 |  |  | 11.7 |  |  | 15.6 |
I&M |  | 10.9 |  |  | 9.8 |  |  | 12.8 |
OPCo |  | 17.1 |  |  | 13.9 |  |  | 10.8 |
PSO |  | 8.4 |  |  | 1.5 |  |  | 2.4 |
SWEPCo |  | 11.5 |  |  | 4.9 |  |  | 7.0 |
Allowance For Borrowed Funds Used During Construction |
|  | Years Ended December 31,
Company |  | 2023 |  | 2022 |  | 2021
|  | (in millions)
AEP |  | $ | 117.3 |  |  | $ | 63.0 |  |  | $ | 53.8 |
AEP Texas |  | 23.4 |  |  | 11.5 |  |  | 10.5 |
AEPTCo |  | 31.4 |  |  | 22.4 |  |  | 21.0 |
APCo |  | 14.1 |  |  | 6.5 |  |  | 7.5 |
I&M |  | 7.7 |  |  | 5.7 |  |  | 5.1 |
OPCo |  | 14.0 |  |  | 6.7 |  |  | 4.7 |
PSO |  | 5.2 |  |  | 2.7 |  |  | 0.7 |
SWEPCo |  | 9.8 |  |  | 4.3 |  |  | 3.0 |
Jointly-owned Electric Facilities |
|  |  |  |  | Registrant’s Share as of December 31, 2023
| Fuel Type |  | Percent of Ownership |  | Utility Plant in Service |  | Construction Work in Progress |  | Accumulated Depreciation
|  |  |  |  | (in millions)
AEP |  |  |  |  |  |  |  |  |
Flint Creek Generating Station, Unit 1 (a) | Coal |  | 50.0 | % |  | $ | 402.8 |  |  | $ | 1.6 |  |  | $ | 167.5 |
Pirkey Plant, Unit 1 (a)(f) | Lignite |  | 85.9 | % |  | — |  |  | — |  |  | — |
Turk Generating Plant (a)(g) | Coal |  | 73.3 | % |  | 1,504.0 |  |  | 10.1 |  |  | 323.3 |
Total |  |  |  |  | $ | 1,906.8 |  |  | $ | 11.7 |  |  | $ | 490.8 |
I&M |  |  |  |  |  |  |  |  |
Rockport Generating Plant (b)(c) | Coal |  | 50.0 | % |  | $ | 1,341.4 |  |  | $ | 7.9 |  |  | $ | 1,018.9 |
PSO |  |  |  |  |  |  |  |  |
North Central Wind Energy Facilities (d)(e) | Wind |  | 45.5 | % |  | $ | 906.3 |  |  | $ | 2.4 |  |  | $ | 54.1 |
SWEPCo |  |  |  |  |  |  |  |  |
Flint Creek Generating Station, Unit 1 (a) | Coal |  | 50.0 | % |  | $ | 402.8 |  |  | $ | 1.6 |  |  | $ | 167.5 |
Pirkey Plant, Unit 1 (a)(f) | Lignite |  | 85.9 | % |  | — |  |  | — |  |  | — |
Turk Generating Plant (a)(g) | Coal |  | 73.3 | % |  | 1,504.0 |  |  | 10.1 |  |  | 323.3 |
North Central Wind Energy Facilities (d)(e) | Wind |  | 54.5 | % |  | 1,086.3 |  |  | 2.9 |  |  | 67.9 |
Total |  |  |  |  | $ | 2,993.1 |  |  | $ | 14.6 |  |  | $ | 558.7 |
|  |  |  |  | Registrant’s Share as of December 31, 2022
| Fuel Type |  | Percent of Ownership |  | Utility Plant in Service |  | Construction Work in Progress |  | Accumulated Depreciation
|  |  |  |  | (in millions)
AEP |  |  |  |  |  |  |  |  |
Flint Creek Generating Station, Unit 1 (a) | Coal |  | 50.0 | % |  | $ | 382.9 |  |  | $ | 16.4 |  |  | $ | 149.4 |
Pirkey Plant, Unit 1 (a) | Lignite |  | 85.9 | % |  | 632.0 |  |  | — |  |  | 632.0 |
Turk Generating Plant (a) | Coal |  | 73.3 | % |  | 1,611.1 |  |  | 5.1 |  |  | 314.7 |
Total |  |  |  |  | $ | 2,626.0 |  |  | $ | 21.5 |  |  | $ | 1,096.1 |
I&M |  |  |  |  |  |  |  |  |
Rockport Generating Plant (b)(c) | Coal |  | 50.0 | % |  | $ | 1,357.4 |  |  | $ | 9.2 |  |  | $ | 905.1 |
PSO |  |  |  |  |  |  |  |  |
North Central Wind Energy Facilities (d)(e) | Wind |  | 45.5 | % |  | $ | 889.3 |  |  | $ | 9.1 |  |  | $ | 28.1 |
SWEPCo |  |  |  |  |  |  |  |  |
Flint Creek Generating Station, Unit 1 (a) | Coal |  | 50.0 | % |  | $ | 382.9 |  |  | $ | 16.4 |  |  | $ | 149.4 |
Pirkey Plant, Unit 1 (a) | Lignite |  | 85.9 | % |  | 632.0 |  |  | — |  |  | 632.0 |
Turk Generating Plant (a) | Coal |  | 73.3 | % |  | 1,611.1 |  |  | 5.1 |  |  | 314.7 |
North Central Wind Energy Facilities (d)(e) | Wind |  | 54.5 | % |  | 1,066.8 |  |  | 10.1 |  |  | 35.2 |
Total |  |  |  |  | $ | 3,692.8 |  |  | $ | 31.6 |  |  | $ | 1,131.3 |
(a)Operated by SWEPCo. (b)Operated by I&M. (c)AEGCo owns 50%. (d)Operated by PSO. (e)PSO and SWEPCo own undivided interests of 45.5% and 54.5% of the NCWF, respectively. (f)Pirkey Plant was retired in March 2023. See "Coal-Fired Generation Plants" of Note 5 for additional information. (g)Includes impact of regulatory disallowance of AFUDC. See “2012 Texas Base Rate Case” section of Note 4 for additional information.

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