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v3.23.1

Property, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 25,834.2 |  | $ 24,319.6 |  |
Property, Plant and Equipment, Transmission |  | 33,266.9 |  | 30,816.3 |  |
Property, Plant and Equipment, Distribution |  | 27,138.8 |  | 25,457.4 |  |
Property, Plant and Equipment, Other |  | 5,971.8 |  | 5,844.9 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 4,809.7 |  | 3,786.8 |  |
Accumulated Depreciation |  | 23,682.3 |  | 21,920.9 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 73,339.1 |  | 68,304.1 |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Beginning Balance | [1],[2],[3],[4],[5],[6] | 2,741.7 |  | 2,516.7 |  |
Accretion Expense | [1],[2],[3],[4],[5],[6] | 111.2 |  | 105.0 |  |
Liabilities Incurred | [1],[2],[3],[4],[5],[6] | 37.4 |  | 22.8 |  |
Liabilities Settled | [1],[2],[3],[4],[5],[6] | (47.0) |  | (41.4) |  |
Revisions in Cash Flow Estimates | [1],[2],[3],[4],[5],[6],[7] | 100.3 |  | 138.6 |  |
Ending Balance | [1],[2],[3],[4],[5],[6] | 2,943.6 |  | 2,741.7 |  | $ 2,516.7
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant |  | 2,000.0 |  | 1,930.0 |  |
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 133.7 |  | 139.7 |  | 148.1
Allowance for Borrowed Funds Used During Construction |  | 63.0 |  | 53.8 |  | 66.0
Jointly-owned Electric Facilities |  |  |  |  |  |
Utility Plant in Service |  | 2,626.0 |  | 2,589.4 |  |
Construction Work in Progress |  | 21.5 |  | 16.5 |  |
Accumulated Depreciation |  | 1,096.1 |  | 947.4 |  |
Asset Impairments and Other Related Charges |  | 48.8 |  | 11.6 |  | 0.0
AEP Texas Inc. [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Transmission |  | 6,301.5 |  | 5,849.9 |  |
Property, Plant and Equipment, Distribution |  | 5,312.8 |  | 4,917.2 |  |
Property, Plant and Equipment, Other |  | 1,022.8 |  | 961.1 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 805.2 |  | 551.3 |  |
Accumulated Depreciation |  | 1,760.7 |  | 1,644.1 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 11,681.6 |  | 10,635.4 |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Beginning Balance | [2],[3] | 4.4 |  | 4.6 |  |
Accretion Expense | [2],[3] | 0.3 |  | 0.2 |  |
Liabilities Incurred | [2],[3] | 0.0 |  | 0.0 |  |
Liabilities Settled | [2],[3] | (0.2) |  | (0.4) |  |
Revisions in Cash Flow Estimates | [2],[3],[7] | 0.0 |  | 0.0 |  |
Ending Balance | [2],[3] | 4.5 |  | 4.4 |  | 4.6
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 19.7 |  | 21.5 |  | 19.4
Allowance for Borrowed Funds Used During Construction |  | 11.5 |  | 10.5 |  | 12.5
AEP Transmission Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Transmission |  | 12,335.4 |  | 11,031.0 |  |
Property, Plant and Equipment, Other |  | 476.8 |  | 451.9 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 1,554.7 |  | 1,402.2 |  |
Accumulated Depreciation |  | 1,027.0 |  | 784.1 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 13,339.9 |  | 12,101.0 |  |
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 70.7 |  | 67.2 |  | 74.0
Allowance for Borrowed Funds Used During Construction |  | 22.4 |  | 21.0 |  | 25.5
Appalachian Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation |  | 6,776.8 |  | 6,683.9 |  |
Property, Plant and Equipment, Transmission |  | 4,482.8 |  | 4,322.4 |  |
Property, Plant and Equipment, Distribution |  | 4,933.0 |  | 4,683.3 |  |
Property, Plant and Equipment, Other |  | 883.3 |  | 696.6 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 705.3 |  | 469.9 |  |
Accumulated Depreciation |  | 5,402.0 |  | 5,051.8 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 12,379.2 |  | 11,804.3 |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Beginning Balance | [2],[3] | 404.6 |  | 313.1 |  |
Accretion Expense | [2],[3] | 15.8 |  | 13.7 |  |
Liabilities Incurred | [2],[3] | 3.0 |  | 0.0 |  |
Liabilities Settled | [2],[3] | (12.7) |  | (6.9) |  |
Revisions in Cash Flow Estimates | [2],[3],[7] | 17.0 |  | 84.7 |  |
Ending Balance | [2],[3] | 427.7 |  | 404.6 |  | 313.1
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 11.7 |  | 15.6 |  | 14.6
Allowance for Borrowed Funds Used During Construction |  | 6.5 |  | 7.5 |  | 7.9
Jointly-owned Electric Facilities |  |  |  |  |  |
Asset Impairments and Other Related Charges |  | 24.9 |  | 0.0 |  | 0.0
Indiana Michigan Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation |  | 5,585.1 |  | 5,531.8 |  |
Property, Plant and Equipment, Transmission |  | 1,842.2 |  | 1,783.1 |  |
Property, Plant and Equipment, Distribution |  | 3,024.7 |  | 2,800.1 |  |
Property, Plant and Equipment, Other |  | 839.3 |  | 792.9 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 253.0 |  | 302.8 |  |
Accumulated Depreciation |  | 4,132.8 |  | 3,899.8 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 7,411.5 |  | 7,310.9 |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Beginning Balance | [2],[3],[4] | 1,946.3 |  | 1,813.8 |  |
Accretion Expense | [2],[3],[4] | 71.5 |  | 72.9 |  |
Liabilities Incurred | [2],[3],[4] | 3.2 |  | 0.3 |  |
Liabilities Settled | [2],[3],[4] | (0.6) |  | (0.1) |  |
Revisions in Cash Flow Estimates | [2],[3],[4],[7] | 7.7 |  | 59.4 |  |
Ending Balance | [2],[3],[4] | 2,028.1 |  | 1,946.3 |  | 1,813.8
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant |  | 2,000.0 |  | 1,930.0 |  |
Fair Value of Legally Restricted Assets |  | 3,010.0 |  | 3,540.0 |  |
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 9.8 |  | 12.8 |  | 11.5
Allowance for Borrowed Funds Used During Construction |  | 5.7 |  | 5.1 |  | 5.7
Ohio Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Transmission |  | 3,198.6 |  | 2,992.8 |  |
Property, Plant and Equipment, Distribution |  | 6,450.3 |  | 6,070.6 |  |
Property, Plant and Equipment, Other |  | 1,051.4 |  | 992.9 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 474.3 |  | 365.0 |  |
Accumulated Depreciation |  | 2,565.3 |  | 2,458.3 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 8,609.3 |  | 7,963.0 |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Beginning Balance | [2] | 1.9 |  | 1.9 |  |
Accretion Expense | [2] | 0.2 |  | 0.1 |  |
Liabilities Incurred | [2] | 3.0 |  | 0.0 |  |
Liabilities Settled | [2] | (0.1) |  | (0.1) |  |
Revisions in Cash Flow Estimates | [2],[7] | 0.0 |  | 0.0 |  |
Ending Balance | [2] | 5.0 |  | 1.9 |  | 1.9
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 13.9 |  | 10.8 |  | 12.5
Allowance for Borrowed Funds Used During Construction |  | 6.7 |  | 4.7 |  | 6.2
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation |  | 2,394.8 |  | 1,802.4 |  |
Property, Plant and Equipment, Transmission |  | 1,164.4 |  | 1,107.7 |  |
Property, Plant and Equipment, Distribution |  | 3,216.4 |  | 3,004.9 |  |
Property, Plant and Equipment, Other |  | 469.3 |  | 437.0 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 219.3 |  | 156.0 |  |
Accumulated Depreciation |  | 1,837.7 |  | 1,705.2 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 5,626.5 |  | 4,802.8 |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Beginning Balance | [2],[3],[6] | 57.6 |  | 47.4 |  |
Accretion Expense | [2],[3],[6] | 4.1 |  | 3.3 |  |
Liabilities Incurred | [2],[3],[6] | 12.8 |  | 7.6 |  |
Liabilities Settled | [2],[3],[6] | (0.7) |  | (0.7) |  |
Revisions in Cash Flow Estimates | [2],[3],[6],[7] | 1.9 |  | 0.0 |  |
Ending Balance | [2],[3],[6] | 75.7 |  | 57.6 |  | 47.4
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 1.5 |  | 2.4 |  | 4.0
Allowance for Borrowed Funds Used During Construction |  | 2.7 |  | 0.7 |  | 2.0
Southwestern Electric Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation |  | 5,476.2 |  | 4,734.5 |  |
Property, Plant and Equipment, Transmission |  | 2,479.8 |  | 2,316.9 |  |
Property, Plant and Equipment, Distribution |  | 2,659.6 |  | 2,514.3 |  |
Property, Plant and Equipment, Other |  | 804.4 |  | 764.0 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 369.5 |  | 240.7 |  |
Accumulated Depreciation |  | 3,527.3 |  | 3,170.3 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 8,262.2 |  | 7,400.1 |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Beginning Balance | [1],[2],[3],[6] | 222.7 |  | 222.1 |  |
Accretion Expense | [1],[2],[3],[6] | 11.9 |  | 9.8 |  |
Liabilities Incurred | [1],[2],[3],[6] | 15.4 |  | 9.2 |  |
Liabilities Settled | [1],[2],[3],[6] | (25.8) |  | (20.9) |  |
Revisions in Cash Flow Estimates | [1],[2],[3],[6],[7] | 56.7 |  | 2.5 |  |
Ending Balance | [1],[2],[3],[6] | 280.9 |  | 222.7 |  | 222.1
Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization |  |  |  |  |  |
Allowance for Equity Funds Used During Construction |  | 4.9 |  | 7.0 |  | 7.7
Allowance for Borrowed Funds Used During Construction |  | 4.3 |  | 3.0 |  | 3.9
Jointly-owned Electric Facilities |  |  |  |  |  |
Utility Plant in Service |  | 3,692.8 |  | 2,965.6 |  |
Construction Work in Progress |  | 31.6 |  | 16.5 |  |
Accumulated Depreciation |  | 1,131.3 |  | 952.8 |  |
Asset Impairments and Other Related Charges |  | $ 0.0 |  | $ 11.6 |  | $ 0.0
Flint Creek Generating Station (Unit No. 1) [Member] | Coal [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership | [8] | 50.00% |  | 50.00% |  |
Utility Plant in Service | [8] | $ 382.9 |  | $ 377.6 |  |
Construction Work in Progress | [8] | 16.4 |  | 6.3 |  |
Accumulated Depreciation | [8] | $ 149.4 |  | $ 133.5 |  |
Flint Creek Generating Station (Unit No. 1) [Member] | Southwestern Electric Power Co [Member] | Coal [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership | [8] | 50.00% |  | 50.00% |  |
Utility Plant in Service | [8] | $ 382.9 |  | $ 377.6 |  |
Construction Work in Progress | [8] | 16.4 |  | 6.3 |  |
Accumulated Depreciation | [8] | $ 149.4 |  | $ 133.5 |  |
Pirkey Generating Station (Unit No. 1) [Member] | Public Utilities, Inventory, Lignite [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership | [8] | 85.90% |  | 85.90% |  |
Utility Plant in Service | [8] | $ 632.0 |  | $ 613.8 |  |
Construction Work in Progress | [8] | 0.0 |  | 0.0 |  |
Accumulated Depreciation | [8] | $ 632.0 |  | $ 528.3 |  |
Pirkey Generating Station (Unit No. 1) [Member] | Southwestern Electric Power Co [Member] | Public Utilities, Inventory, Lignite [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership | [8] | 85.90% |  | 85.90% |  |
Utility Plant in Service | [8] | $ 632.0 |  | $ 613.8 |  |
Construction Work in Progress | [8] | 0.0 |  | 0.0 |  |
Accumulated Depreciation | [8] | $ 632.0 |  | $ 528.3 |  |
Turk Generating Plant [Member] | Coal [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership | [8] | 73.30% |  | 73.30% |  |
Utility Plant in Service | [8] | $ 1,611.1 |  | $ 1,598.0 |  |
Construction Work in Progress | [8] | 5.1 |  | 10.2 |  |
Accumulated Depreciation | [8] | $ 314.7 |  | $ 285.6 |  |
Turk Generating Plant [Member] | Southwestern Electric Power Co [Member] | Coal [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership | [8] | 73.30% |  | 73.30% |  |
Utility Plant in Service | [8] | $ 1,611.1 |  | $ 1,598.0 |  |
Construction Work in Progress | [8] | 5.1 |  | 10.2 |  |
Accumulated Depreciation | [8] | $ 314.7 |  | $ 285.6 |  |
Rockport Generating Plant (Unit No. 2) [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership |  | 100.00% |  |  |  |
NCWF [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership |  | 45.50% |  |  |  |
NCWF [Member] | Public Service Co Of Oklahoma [Member] | Wind [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership | [9],[10] | 45.50% |  | 45.50% |  |
Utility Plant in Service | [9],[10] | $ 889.3 |  | $ 313.7 |  |
Construction Work in Progress | [9],[10] | 9.1 |  | 0.0 |  |
Accumulated Depreciation | [9],[10] | $ 28.1 |  | $ 4.2 |  |
NCWF [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership |  | 54.50% |  |  |  |
NCWF [Member] | Southwestern Electric Power Co [Member] | Wind [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership | [9],[10] | 54.50% |  | 54.50% |  |
Utility Plant in Service | [9],[10] | $ 1,066.8 |  | $ 376.2 |  |
Construction Work in Progress | [9],[10] | 10.1 |  | 0.0 |  |
Accumulated Depreciation | [9],[10] | $ 35.2 |  | $ 5.4 |  |
Rockport Generating Plant | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership |  | 50.00% |  |  |  |
Rockport Generating Plant | Indiana Michigan Power Co [Member] | Coal [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership | [11],[12],[13] | 50.00% |  | 50.00% |  |
Utility Plant in Service | [11],[12],[13] | $ 1,357.4 |  | $ 1,247.2 |  |
Construction Work in Progress | [11],[12],[13] | 9.2 |  | 13.9 |  |
Accumulated Depreciation | [11],[12],[13] | $ 905.1 |  | 794.5 |  |
Rockport Generating Plant | AEP Generating Co [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Percent of Ownership |  | 50.00% |  |  |  |
Regulated Operation [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation | [14] | $ 23,759.7 |  | 22,428.3 |  |
Property, Plant and Equipment, Transmission |  | 33,221.7 |  | 30,771.1 |  |
Property, Plant and Equipment, Distribution |  | 27,138.8 |  | 25,457.4 |  |
Property, Plant and Equipment, Other |  | 5,528.9 |  | 5,403.5 |  |
Property, Plant and Equipment, Construction Work in Progress | [14] | 4,776.4 |  | 3,734.8 |  |
Accumulated Depreciation |  | 23,118.0 |  | 21,491.1 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 71,307.5 |  | $ 66,304.0 |  |
Regulated Operation [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 132 years |  | 132 years |  | 132 years
Depreciable Life Ranges - Transmission |  | 75 years |  | 75 years |  | 75 years
Depreciable Life Ranges - Distribution |  | 78 years |  | 80 years |  | 78 years
Depreciable Life Ranges - Other |  | 75 years |  | 75 years |  | 75 years
Regulated Operation [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 20 years |  | 20 years |  | 20 years
Depreciable Life Ranges - Transmission |  | 24 years |  | 15 years |  | 15 years
Depreciable Life Ranges - Distribution |  | 7 years |  | 7 years |  | 7 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years |  | 5 years
Regulated Operation [Member] | Generation [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 7.60% |  | 7.80% |  | 6.30%
Regulated Operation [Member] | Generation [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.70% |  | 2.70% |  | 2.70%
Regulated Operation [Member] | Transmission [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.70% |  | 2.60% |  | 2.60%
Regulated Operation [Member] | Transmission [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.00% |  | 2.00% |  | 2.00%
Regulated Operation [Member] | Distribution [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.60% |  | 3.60% |  | 3.70%
Regulated Operation [Member] | Distribution [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.70% |  | 2.80% |  | 2.70%
Regulated Operation [Member] | Other Property Class [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 14.40% |  | 12.50% |  | 11.30%
Regulated Operation [Member] | Other Property Class [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.10% |  | 3.00% |  | 2.80%
Regulated Operation [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 0.0 |  | $ 0.0 |  |
Property, Plant and Equipment, Transmission |  | 6,301.5 |  | 5,849.9 |  |
Property, Plant and Equipment, Distribution |  | 5,312.8 |  | 4,917.2 |  |
Property, Plant and Equipment, Other |  | 1,020.4 |  | 958.7 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 805.2 |  | 551.3 |  |
Accumulated Depreciation |  | 1,759.5 |  | 1,642.9 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 11,680.4 |  | $ 10,634.2 |  |
Regulated Operation [Member] | AEP Texas Inc. [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 75 years |  | 75 years |  | 75 years
Depreciable Life Ranges - Distribution |  | 70 years |  | 70 years |  | 70 years
Depreciable Life Ranges - Other |  | 50 years |  | 50 years |  | 50 years
Regulated Operation [Member] | AEP Texas Inc. [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 50 years |  | 50 years |  | 50 years
Depreciable Life Ranges - Distribution |  | 7 years |  | 7 years |  | 7 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years |  | 5 years
Regulated Operation [Member] | AEP Texas Inc. [Member] | Transmission [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.20% |  | 2.20% |  | 2.00%
Regulated Operation [Member] | AEP Texas Inc. [Member] | Distribution [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.90% |  | 2.90% |  | 3.10%
Regulated Operation [Member] | AEP Texas Inc. [Member] | Other Property Class [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 6.20% |  | 5.80% |  | 6.10%
Regulated Operation [Member] | AEP Transmission Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 0.0 |  | $ 0.0 |  |
Property, Plant and Equipment, Transmission |  | 12,335.4 |  | 11,031.0 |  |
Property, Plant and Equipment, Distribution |  | 0.0 |  | 0.0 |  |
Property, Plant and Equipment, Other |  | 476.6 |  | 451.7 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 1,554.7 |  | 1,402.2 |  |
Accumulated Depreciation |  | 1,027.1 |  | 784.0 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 13,339.6 |  | $ 12,100.9 |  |
Regulated Operation [Member] | AEP Transmission Co [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 75 years |  | 75 years |  | 75 years
Depreciable Life Ranges - Other |  | 56 years |  | 56 years |  | 64 years
Regulated Operation [Member] | AEP Transmission Co [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 24 years |  | 24 years |  | 24 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years |  | 5 years
Regulated Operation [Member] | AEP Transmission Co [Member] | Transmission [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.60% |  | 2.50% |  | 2.40%
Regulated Operation [Member] | AEP Transmission Co [Member] | Other Property Class [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 6.60% |  | 6.70% |  | 6.30%
Regulated Operation [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 6,776.8 |  | $ 6,683.9 |  |
Property, Plant and Equipment, Transmission |  | 4,482.8 |  | 4,322.4 |  |
Property, Plant and Equipment, Distribution |  | 4,933.0 |  | 4,683.3 |  |
Property, Plant and Equipment, Other |  | 849.2 |  | 668.9 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 705.3 |  | 469.9 |  |
Accumulated Depreciation |  | 5,397.3 |  | 5,047.4 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 12,349.8 |  | $ 11,781.0 |  |
Regulated Operation [Member] | Appalachian Power Co [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 118 years |  | 118 years |  | 118 years
Depreciable Life Ranges - Transmission |  | 75 years |  | 75 years |  | 75 years
Depreciable Life Ranges - Distribution |  | 57 years |  | 57 years |  | 57 years
Depreciable Life Ranges - Other |  | 55 years |  | 55 years |  | 55 years
Regulated Operation [Member] | Appalachian Power Co [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 35 years |  | 35 years |  | 35 years
Depreciable Life Ranges - Transmission |  | 24 years |  | 15 years |  | 15 years
Depreciable Life Ranges - Distribution |  | 12 years |  | 12 years |  | 12 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years |  | 5 years
Regulated Operation [Member] | Appalachian Power Co [Member] | Generation [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.60% |  | 3.60% |  | 3.30%
Regulated Operation [Member] | Appalachian Power Co [Member] | Transmission [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.20% |  | 2.10% |  | 2.20%
Regulated Operation [Member] | Appalachian Power Co [Member] | Distribution [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.60% |  | 3.50% |  | 3.70%
Regulated Operation [Member] | Appalachian Power Co [Member] | Other Property Class [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 7.30% |  | 8.50% |  | 7.80%
Regulated Operation [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 5,534.6 |  | $ 5,531.8 |  |
Property, Plant and Equipment, Transmission |  | 1,842.2 |  | 1,783.1 |  |
Property, Plant and Equipment, Distribution |  | 3,024.7 |  | 2,800.1 |  |
Property, Plant and Equipment, Other |  | 796.1 |  | 755.1 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 253.0 |  | 302.8 |  |
Accumulated Depreciation |  | 4,117.8 |  | 3,885.3 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 7,332.8 |  | $ 7,287.6 |  |
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 132 years |  | 132 years |  | 132 years
Depreciable Life Ranges - Transmission |  | 67 years |  | 70 years |  | 70 years
Depreciable Life Ranges - Distribution |  | 71 years |  | 71 years |  | 71 years
Depreciable Life Ranges - Other |  | 45 years |  | 51 years |  | 51 years
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 20 years |  | 20 years |  | 20 years
Depreciable Life Ranges - Transmission |  | 44 years |  | 45 years |  | 45 years
Depreciable Life Ranges - Distribution |  | 14 years |  | 14 years |  | 14 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years |  | 5 years
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Generation [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 4.90% |  | 4.70% |  | 4.60%
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Transmission [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.50% |  | 2.40% |  | 2.30%
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Distribution [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.10% |  | 3.40% |  | 3.40%
Regulated Operation [Member] | Indiana Michigan Power Co [Member] | Other Property Class [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 10.10% |  | 9.00% |  | 10.20%
Regulated Operation [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 0.0 |  | $ 0.0 |  |
Property, Plant and Equipment, Transmission |  | 3,198.6 |  | 2,992.8 |  |
Property, Plant and Equipment, Distribution |  | 6,450.3 |  | 6,070.6 |  |
Property, Plant and Equipment, Other |  | 1,040.6 |  | 982.2 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 474.3 |  | 365.0 |  |
Accumulated Depreciation |  | 2,564.3 |  | 2,457.4 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 8,599.5 |  | $ 7,953.2 |  |
Regulated Operation [Member] | Ohio Power Co [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 60 years |  | 60 years |  | 60 years
Depreciable Life Ranges - Distribution |  | 70 years |  | 70 years |  | 65 years
Depreciable Life Ranges - Other |  | 50 years |  | 50 years |  | 50 years
Regulated Operation [Member] | Ohio Power Co [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Transmission |  | 39 years |  | 39 years |  | 39 years
Depreciable Life Ranges - Distribution |  | 11 years |  | 11 years |  | 14 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years |  | 5 years
Regulated Operation [Member] | Ohio Power Co [Member] | Transmission [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.30% |  | 2.30% |  | 2.30%
Regulated Operation [Member] | Ohio Power Co [Member] | Distribution [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.70% |  | 2.90% |  | 3.10%
Regulated Operation [Member] | Ohio Power Co [Member] | Other Property Class [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 6.10% |  | 6.10% |  | 5.00%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation |  | $ 2,394.8 |  | $ 1,802.4 |  |
Property, Plant and Equipment, Transmission |  | 1,164.4 |  | 1,107.7 |  |
Property, Plant and Equipment, Distribution |  | 3,216.4 |  | 3,004.9 |  |
Property, Plant and Equipment, Other |  | 466.0 |  | 433.5 |  |
Property, Plant and Equipment, Construction Work in Progress |  | 219.3 |  | 156.0 |  |
Accumulated Depreciation |  | 1,839.4 |  | 1,707.0 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 5,621.5 |  | $ 4,797.5 |  |
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 75 years |  | 75 years |  | 75 years
Depreciable Life Ranges - Transmission |  | 75 years |  | 75 years |  | 75 years
Depreciable Life Ranges - Distribution |  | 78 years |  | 78 years |  | 78 years
Depreciable Life Ranges - Other |  | 56 years |  | 56 years |  | 64 years
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 30 years |  | 30 years |  | 35 years
Depreciable Life Ranges - Transmission |  | 42 years |  | 42 years |  | 45 years
Depreciable Life Ranges - Distribution |  | 15 years |  | 15 years |  | 15 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years |  | 5 years
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Generation [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.10% |  | 2.80% |  | 3.10%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Transmission [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.50% |  | 2.40% |  | 2.20%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Distribution [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.90% |  | 2.90% |  | 2.90%
Regulated Operation [Member] | Public Service Co Of Oklahoma [Member] | Other Property Class [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 6.80% |  | 6.10% |  | 5.70%
Regulated Operation [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Property, Plant and Equipment, Generation | [14] | $ 5,476.2 |  | $ 4,734.5 |  |
Property, Plant and Equipment, Transmission |  | 2,479.8 |  | 2,316.9 |  |
Property, Plant and Equipment, Distribution |  | 2,659.6 |  | 2,514.3 |  |
Property, Plant and Equipment, Other |  | 582.6 |  | 542.0 |  |
Property, Plant and Equipment, Construction Work in Progress | [14] | 369.5 |  | 240.7 |  |
Accumulated Depreciation |  | 3,314.8 |  | 3,002.2 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 8,252.9 |  | $ 7,346.2 |  |
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 65 years |  | 65 years |  | 65 years
Depreciable Life Ranges - Transmission |  | 70 years |  | 74 years |  | 73 years
Depreciable Life Ranges - Distribution |  | 75 years |  | 80 years |  | 67 years
Depreciable Life Ranges - Other |  | 57 years |  | 58 years |  | 52 years
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 30 years |  | 30 years |  | 35 years
Depreciable Life Ranges - Transmission |  | 44 years |  | 49 years |  | 47 years
Depreciable Life Ranges - Distribution |  | 15 years |  | 15 years |  | 15 years
Depreciable Life Ranges - Other |  | 5 years |  | 5 years |  | 5 years
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Generation [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.70% |  | 2.70% |  | 2.70%
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Transmission [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.30% |  | 2.40% |  | 2.30%
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Distribution [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.90% |  | 2.80% |  | 2.70%
Regulated Operation [Member] | Southwestern Electric Power Co [Member] | Other Property Class [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 9.00% |  | 8.60% |  | 8.50%
Unregulated Operation [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 2,031.6 |  | $ 2,000.1 |  |
Unregulated Operation [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 61 years |  | 59 years |  | 59 years
Depreciable Life Ranges - Transmission |  | 62 years |  | 40 years |  | 40 years
Depreciable Life Ranges - Other |  | 35 years | [15] | 35 years | [15] | 50 years
Unregulated Operation [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Depreciable Life Ranges - Generation |  | 3 years |  | 10 years |  | 15 years
Depreciable Life Ranges - Transmission |  | 10 years |  | 30 years |  | 30 years
Depreciable Life Ranges - Other |  | 5 years | [15] | 5 years | [15] | 5 years
Unregulated Operation [Member] | Generation [Member] | Maximum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 8.70% |  | 10.40% |  | 4.00%
Unregulated Operation [Member] | Generation [Member] | Minimum [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 3.80% |  | 3.80% |  | 3.60%
Unregulated Operation [Member] | Transmission [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 2.80% |  | 2.60% |  | 2.50%
Unregulated Operation [Member] | Other Property Class [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
Annual Composite Depreciation Rate |  | 25.20% |  | 16.50% |  | 16.10%
Unregulated Operation [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | $ 1.2 |  | $ 1.2 |  |
Unregulated Operation [Member] | AEP Transmission Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 0.3 |  | 0.1 |  |
Unregulated Operation [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 29.4 |  | 23.3 |  |
Unregulated Operation [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 78.7 |  | 23.3 |  |
Unregulated Operation [Member] | Ohio Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 9.8 |  | 9.8 |  |
Unregulated Operation [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 5.0 |  | 5.3 |  |
Unregulated Operation [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET |  | 9.3 |  | 53.9 |  |
Glen Lyn Station [Member] | Appalachian Power Co [Member] |  |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Revisions in Cash Flow Estimates |  |  |  | 79.0 |  |
Cook Nuclear Plant [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Revisions in Cash Flow Estimates |  |  |  | 58.0 |  |
Amos Plant | Appalachian Power Co [Member] |  |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Revisions in Cash Flow Estimates |  | 14.0 |  |  |  |
Traverse [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Liabilities Incurred |  | 13.0 |  |  |  |
Traverse [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Liabilities Incurred |  | 15.0 |  |  |  |
Pirkey Power Plant | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Revisions in Cash Flow Estimates |  | 13.0 |  |  |  |
Sabine Mining Co [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Property, Plant and Equipment (Textuals) |  |  |  |  |  |
Asset Retirement Obligation, Revision of Estimate, Estimated Reclamation Costs - 1 |  | 16.0 |  |  |  |
Asset Retirement Obligation, Revision of Estimate, Estimated Reclamation Costs - 2 |  | 7.0 |  |  |  |
Pirkey Power Plant | Southwestern Electric Power Co [Member] |  |  |  |  |  |
Asset Retirement Obligations (ARO) |  |  |  |  |  |
Revisions in Cash Flow Estimates |  | 14.0 |  |  |  |
Generation and Marketing [Member] |  |  |  |  |  |
Jointly-owned Electric Facilities |  |  |  |  |  |
Asset Impairments and Other Related Charges |  | $ 0.0 |  | $ 0.0 |  |
[1] | Includes ARO related to Sabine and DHLC.
[2] | Includes ARO related to asbestos removal.
[3] | Includes ARO related to ash disposal facilities.
[4] | Includes ARO related to nuclear decommissioning costs for the Cook Plant of $2 billion and $1.93 billion as of December 31, 2022 and 2021, respectively.
[5] | Includes ARO related to solar farms.
[6] | Includes ARO related to wind 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.
[8] | Operated by SWEPCo.
[9] | Operated by PSO.
[10] | PSO and SWEPCo own undivided interests of 45.5% and 54.5% of the NCWF, respectively. Sundance was placed into service in April 2021. Maverick was placed into service in September 2021. Traverse was placed into service in March 2022. See the “Acquisitions” section of Note 7 for additional information.
[11] | AEGCo owns 50%.
[12] | Amounts include I&M's 50% ownership of both Unit 1 and capital additions for Unit 2. Unit 2 was subject to a finance lease with a nonaffiliated company. In December 2022, the lease expired at which point I&M and AEGCo acquired 100% of the interests in Unit 2. See the "Rockport Plant Litigation" section of Note 6 for additional information.
[13] | Operated by I&M.
[14] | AEP and SWEPCo’s regulated generation and regulated CWIP include amounts related to SWEPCo’s Arkansas jurisdictional share of the Turk Plant.
[15] | In 2020 management announced plans to retire the Pirkey Plant in 2023 and the related depreciable lives have been adjusted accordingly. See Note 5 - Effects of Regulation for additional information.

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