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Organization and Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Materials and Supplies | $ 1,025.8 | $ 915.1 |  |
Supplementary Information |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 2,927.5 | 3,072.8 | $ 2,717.1 |
Amortization of Certain Securitized Assets | 91.9 | 93.3 | 64.2 |
Amortization of Regulatory Assets and Liabilities | 71.0 | 36.7 | 44.4 |
Total Depreciation and Amortization | 3,090.4 | 3,202.8 | 2,825.7 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |
Cash and Cash Equivalents at Beginning of Period | 509.4 |  |  |
Restricted Cash | 48.9 | 47.1 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 379.0 | 556.5 | 451.4 | $ 438.3
Amounts Attributable to AEP Common Shareholders |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interests | 4.5 | (1.6) | 0.0 |
Net Income (Loss) | $ 2,208.1 | $ 2,307.2 | $ 2,488.1 |
Weighted Average Number of Basic AEP Common Shares Outstanding | 518,903,682 | 511,841,946 | 500,522,177 |
Earnings Per Share, Basic | $ 4.26 | $ 4.51 | $ 4.97 |
Weighted Average Dilutive Effect of: |  |  |  |
Weighted Average Number of Diluted AEP Common Shares Outstanding | 520,206,258 | 513,484,609 | 501,784,032 |
Earnings Per Share, Diluted | $ 4.24 | $ 4.49 | $ 4.96 |
Revenues |  |  |  |
TOTAL REVENUES | $ 18,982.3 | $ 19,639.5 | $ 16,792.0 |
Expenses |  |  |  |
Depreciation and Amortization | 3,090.4 | 3,202.8 | 2,825.7 |
TOTAL EXPENSES | 15,426.1 | 16,156.8 | 13,380.7 |
OPERATING INCOME (LOSS) | 3,556.2 | 3,482.7 | 3,411.3 |
Other Income (Expense) |  |  |  |
Allowance for Equity Funds Used During Construction | 174.9 | 133.7 | 139.7 |
Interest Expense | (1,806.9) | (1,396.1) | (1,199.1) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) | 2,208.7 | 2,420.4 | 2,511.9 |
Income Tax Expense (Benefit) | 54.6 | 5.4 | 115.5 |
Net Income (Loss) | 2,212.6 | 2,305.6 | 2,488.1 |
Accounts Receivable: |  |  |  |
Customers | 1,029.9 | 1,145.1 |  |
Total Accounts Receivable | 2,447.4 | 2,668.0 |  |
Accrued Tax Benefits | 156.2 | 99.4 |  |
TOTAL CURRENT ASSETS | 6,082.1 | 6,775.5 |  |
Property, Plant and Equipment |  |  |  |
Transmission | 35,934.1 | 33,266.9 |  |
Other Property, Plant and Equipment | 6,484.9 | 5,971.8 |  |
Construction Work in Progress | 5,508.0 | 4,809.7 |  |
Total Property, Plant and Equipment | 101,246.4 | 97,021.4 |  |
Accumulated Depreciation and Amortization | 24,553.0 | 23,682.3 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET | 76,693.4 | 73,339.1 |  |
Other Noncurrent Assets |  |  |  |
TOTAL OTHER NONCURRENT ASSETS | 13,908.5 | 13,288.7 |  |
TOTAL ASSETS | 96,684.0 | 93,403.3 |  |
Current Liabilities |  |  |  |
Accounts Payable | 2,032.5 | 2,670.8 |  |
Accrued Taxes | 1,800.1 | 1,714.6 |  |
TOTAL CURRENT LIABILITIES | 11,583.6 | 13,266.3 |  |
Liabilities, Noncurrent |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits | 8,182.4 | 8,115.6 |  |
TOTAL NONCURRENT LIABILITIES | 59,772.0 | 55,968.7 |  |
TOTAL LIABILITIES | 71,355.6 | 69,235.0 |  |
Equity [Abstract] |  |  |  |
Retained Earnings | 12,800.4 | 12,345.6 |  |
TOTAL LIABILITIES AND EQUITY | 96,684.0 | 93,403.3 |  |
Operating Activites |  |  |  |
Net Income (Loss) | 2,212.6 | 2,305.6 | 2,488.1 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |
Depreciation and Amortization | 3,090.4 | 3,202.8 | 2,825.7 |
Deferred Income Taxes | 185.1 | (137.2) | 107.6 |
Allowance for Equity Funds Used During Construction | (174.9) | (133.7) | (139.7) |
Amortization of Deferred Property Taxes | (41.1) | (41.2) | (68.0) |
Change in Other Noncurrent Assets | (465.1) | (187.7) | (126.6) |
Increase (Decrease) in Other Noncurrent Liabilities | 29.0 | 337.8 | 206.4 |
Accounts Receivable, Net | 236.5 | (681.7) | (119.7) |
Accounts Payable | (253.2) | 489.2 | 200.6 |
Accrued Taxes, Net | 22.5 | 105.4 | 218.7 |
Net Cash Flows from Operating Activities | 5,012.2 | 5,288.0 | 3,839.9 |
Investing Activities |  |  |  |
Net Cash Flows Used for Investing Activities | (6,266.7) | (7,751.8) | (6,433.9) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |
Net Cash Flows from Financing Activities | 1,077.0 | 2,568.9 | 2,607.1 |
Cash and Cash Equivalents at Beginning of Period | 509.4 |  |  |
Cash and Cash Equivalents at End of Period | 330.1 | 509.4 |  |
Cash Paid (Received) for: |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 1,673.5 | 1,286.3 | 1,137.2 |
Income Taxes | 78.4 | 116.8 | 13.2 |
Cash Received from the Sale of Transferable Tax Credits | (102.0) | 0.0 | 0.0 |
Noncash Investing and Financing Activities: |  |  |  |
Noncash Acquisition Under Finance Leases | 48.7 | 31.8 | 287.6 |
Construction in Progress Expenditures Incurred but Not yet Paid | 842.4 | 1,258.9 | 1,180.4 |
Construction Expenditures Included in Current Liabilities as of December 31, | 842.4 | 1,258.9 | 1,180.4 |
Acquisition of Nuclear Fuel Included in Current Liabilities as of December 31, | 24.2 | 0.0 | 0.0 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Issuance of Long-term Debt | 5,462.8 | 4,649.7 | 6,486.3 |
Repayments of Long-term Debt | $ 2,196.1 | 2,345.4 | 2,989.3 |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Equity Method Investment | $ 1,073.6 | 1,276.7 | 1,447.5 |
Income (Loss) from Equity Method Investment | $ 58.5 | $ (109.4) | 91.7 |
Antidilutive Shares Outstanding | 0 | 0 |  |
Net Income (Loss) | $ 2,212.6 | $ 2,305.6 | 2,488.1 |
Retained Earnings | 12,800.4 | 12,345.6 |  |
Cedar Creek Project |  |  |  |
Noncash Investing and Financing Activities: |  |  |  |
Noncash Contribution of Assets to Cedar Creek Project | 0.0 | 0.0 | (9.3) |
Competitive Contracted Renewables |  |  |  |
Noncash Investing and Financing Activities: |  |  |  |
Noncash or Part Noncash Divestiture, Amount of Consideration Received | 74.7 | 0.0 | 0.0 |
Retained Earnings [Member] |  |  |  |
Amounts Attributable to AEP Common Shareholders |  |  |  |
Net Income (Loss) | $ 2,208.1 | 2,307.2 | 2,488.1 |
Berkshire Hathaway [Member] |  |  |  |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
AEP Transmission Holdco [Member] |  |  |  |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Pension Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 30.00% |  |  |
Pension Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 54.00% |  |  |
Pension Plans [Member] | Other Investments [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 15.00% |  |  |
Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 58.00% |  |  |
Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 41.00% |  |  |
Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Pension and Other Postretirement Benefit Plans [Member] |  |  |  |
Supplementary Information |  |  |  |
Securities Loaned | $ 62.0 | 83.0 |  |
AEP Texas Inc. [Member] |  |  |  |
Materials and Supplies | 190.4 | 138.8 |  |
Supplementary Information |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 380.0 | 363.5 | 327.2 |
Amortization of Certain Securitized Assets | 91.9 | 93.3 | 64.2 |
Amortization of Regulatory Assets and Liabilities | (3.4) | (4.4) | (4.4) |
Total Depreciation and Amortization | 468.5 | 452.4 | 387.0 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |
Cash and Cash Equivalents at Beginning of Period | 0.1 |  |  |
Restricted Cash | 34.0 | 32.7 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 34.1 | 32.8 | 30.5 | 28.8
Revenues |  |  |  |
TOTAL REVENUES | 1,901.9 | 1,846.8 | 1,593.8 |
Expenses |  |  |  |
Depreciation and Amortization | 468.5 | 452.4 | 387.0 |
TOTAL EXPENSES | 1,262.8 | 1,297.6 | 1,117.8 |
OPERATING INCOME (LOSS) | 639.1 | 549.2 | 476.0 |
Other Income (Expense) |  |  |  |
Allowance for Equity Funds Used During Construction | 28.4 | 19.7 | 21.5 |
Interest Expense | (232.7) | (208.7) | (176.5) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) | 456.3 | 380.5 | 332.9 |
Income Tax Expense (Benefit) | 85.9 | 72.6 | 43.1 |
Net Income (Loss) | 370.4 | 307.9 | 289.8 |
Accounts Receivable: |  |  |  |
Customers | 176.5 | 150.9 |  |
Total Accounts Receivable | 278.5 | 250.2 |  |
TOTAL CURRENT ASSETS | 520.1 | 446.9 |  |
Property, Plant and Equipment |  |  |  |
Transmission | 6,812.6 | 6,301.5 |  |
Other Property, Plant and Equipment | 1,145.9 | 1,022.8 |  |
Construction Work in Progress | 904.6 | 805.2 |  |
Total Property, Plant and Equipment | 14,661.9 | 13,442.3 |  |
Accumulated Depreciation and Amortization | 1,887.9 | 1,760.7 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET | 12,774.0 | 11,681.6 |  |
Other Noncurrent Assets |  |  |  |
TOTAL OTHER NONCURRENT ASSETS | 696.6 | 763.7 |  |
TOTAL ASSETS | 13,990.7 | 12,892.2 |  |
Current Liabilities |  |  |  |
Accounts Payable | 192.3 | 331.0 |  |
Accrued Taxes | 99.1 | 95.5 |  |
TOTAL CURRENT LIABILITIES | 749.4 | 1,043.8 |  |
Liabilities, Noncurrent |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits | 1,261.4 | 1,259.6 |  |
TOTAL NONCURRENT LIABILITIES | 8,445.2 | 7,944.1 |  |
TOTAL LIABILITIES | 9,194.6 | 8,987.9 |  |
Equity [Abstract] |  |  |  |
Retained Earnings | 2,725.1 | 2,354.7 |  |
TOTAL LIABILITIES AND EQUITY | 13,990.7 | 12,892.2 |  |
Operating Activites |  |  |  |
Net Income (Loss) | 370.4 | 307.9 | 289.8 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |
Depreciation and Amortization | 468.5 | 452.4 | 387.0 |
Deferred Income Taxes | 64.1 | 42.2 | 43.0 |
Allowance for Equity Funds Used During Construction | (28.4) | (19.7) | (21.5) |
Change in Other Noncurrent Assets | (96.5) | (36.2) | (78.2) |
Increase (Decrease) in Other Noncurrent Liabilities | 24.3 | 57.6 | 26.4 |
Accounts Receivable, Net | (28.3) | (45.0) | (21.6) |
Accounts Payable | (24.1) | 25.0 | 8.9 |
Accrued Taxes, Net | 11.8 | 14.8 | 7.0 |
Net Cash Flows from Operating Activities | 659.7 | 731.9 | 596.6 |
Investing Activities |  |  |  |
Net Cash Flows Used for Investing Activities | (1,408.0) | (1,269.9) | (1,000.8) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |
Net Cash Flows from Financing Activities | 749.6 | 540.3 | 405.9 |
Cash and Cash Equivalents at Beginning of Period | 0.1 |  |  |
Cash and Cash Equivalents at End of Period | 0.1 | 0.1 |  |
Cash Paid (Received) for: |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 225.6 | 198.9 | 168.9 |
Income Taxes | 11.5 | 11.0 | 5.7 |
Noncash Investing and Financing Activities: |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid | 112.2 | 235.4 | 230.0 |
Construction Expenditures Included in Current Liabilities as of December 31, | 112.2 | 235.4 | 230.0 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Issuance of Long-term Debt | 505.4 | 1,188.6 | 444.2 |
Repayments of Long-term Debt | 278.5 | 716.0 | 88.7 |
Net Income (Loss) | 370.4 | 307.9 | 289.8 |
Retained Earnings | 2,725.1 | 2,354.7 |  |
AEP Texas Inc. [Member] | Retained Earnings [Member] |  |  |  |
Other Income (Expense) |  |  |  |
Net Income (Loss) | 370.4 | 307.9 | 289.8 |
Operating Activites |  |  |  |
Net Income (Loss) | 370.4 | 307.9 | 289.8 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Net Income (Loss) | $ 370.4 | 307.9 | 289.8 |
AEP Texas Inc. [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 30.00% |  |  |
AEP Texas Inc. [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 54.00% |  |  |
AEP Texas Inc. [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 15.00% |  |  |
AEP Texas Inc. [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
AEP Texas Inc. [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 58.00% |  |  |
AEP Texas Inc. [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 41.00% |  |  |
AEP Texas Inc. [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
AEP Texas Inc. [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |
Supplementary Information |  |  |  |
Securities Loaned | $ 62.0 | 83.0 |  |
AEP Transmission Co [Member] |  |  |  |
Materials and Supplies | 0.0 | 10.7 |  |
Supplementary Information |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 393.8 | 346.2 | 297.3 |
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities | 0.0 | 0.0 | 0.0 |
Total Depreciation and Amortization | 393.8 | 346.2 | 297.3 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |
Cash and Cash Equivalents at Beginning of Period | 0.0 | 0.0 | 0.0 |
Revenues |  |  |  |
TOTAL REVENUES | 1,672.0 | 1,624.5 | 1,469.3 |
Expenses |  |  |  |
Depreciation and Amortization | 393.8 | 346.2 | 297.3 |
TOTAL EXPENSES | 806.4 | 770.8 | 660.0 |
OPERATING INCOME (LOSS) | 865.6 | 853.7 | 809.3 |
Other Income (Expense) |  |  |  |
Allowance for Equity Funds Used During Construction | 83.2 | 70.7 | 67.2 |
Interest Expense | (194.5) | (162.7) | (141.2) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) | 761.3 | 763.3 | 735.8 |
Income Tax Expense (Benefit) | 147.1 | 169.1 | 144.1 |
Net Income (Loss) | 614.2 | 594.2 | 591.7 |
Accounts Receivable: |  |  |  |
Customers | 82.2 | 46.9 |  |
Total Accounts Receivable | 207.7 | 166.4 |  |
TOTAL CURRENT ASSETS | 278.8 | 188.7 |  |
Property, Plant and Equipment |  |  |  |
Transmission | 13,723.9 | 12,335.4 |  |
Other Property, Plant and Equipment | 501.4 | 476.8 |  |
Construction Work in Progress | 1,563.7 | 1,554.7 |  |
Total Property, Plant and Equipment | 15,789.0 | 14,366.9 |  |
Accumulated Depreciation and Amortization | 1,291.3 | 1,027.0 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET | 14,497.7 | 13,339.9 |  |
Other Noncurrent Assets |  |  |  |
Deferred Property Taxes | 286.4 | 266.6 |  |
TOTAL OTHER NONCURRENT ASSETS | 296.0 | 285.6 |  |
TOTAL ASSETS | 15,072.5 | 13,814.2 |  |
Current Liabilities |  |  |  |
Accounts Payable | 274.7 | 427.8 |  |
Accrued Taxes | 568.6 | 529.8 |  |
TOTAL CURRENT LIABILITIES | 1,286.1 | 1,368.0 |  |
Liabilities, Noncurrent |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits | 783.7 | 723.3 |  |
TOTAL NONCURRENT LIABILITIES | 7,453.1 | 6,573.2 |  |
TOTAL LIABILITIES | 8,739.2 | 7,941.2 |  |
Equity [Abstract] |  |  |  |
Retained Earnings | 3,289.9 | 2,850.7 |  |
TOTAL MEMBER'S EQUITY | 6,333.3 | 5,873.0 | 5,376.1 | 4,712.9
TOTAL LIABILITIES AND EQUITY | 15,072.5 | 13,814.2 |  |
Operating Activites |  |  |  |
Net Income (Loss) | 614.2 | 594.2 | 591.7 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |
Depreciation and Amortization | 393.8 | 346.2 | 297.3 |
Deferred Income Taxes | 44.1 | 62.3 | 68.5 |
Allowance for Equity Funds Used During Construction | (83.2) | (70.7) | (67.2) |
Amortization of Deferred Property Taxes | (19.8) | (20.9) | (25.6) |
Change in Other Noncurrent Assets | 8.6 | (7.4) | 7.5 |
Increase (Decrease) in Other Noncurrent Liabilities | 134.2 | 68.7 | 3.7 |
Accounts Receivable, Net | (41.3) | (46.3) | (16.0) |
Accounts Payable | 22.8 | 18.5 | (2.2) |
Accrued Taxes, Net | 42.9 | 50.2 | 67.2 |
Net Cash Flows from Operating Activities | 1,137.6 | 995.3 | 925.7 |
Investing Activities |  |  |  |
Net Cash Flows Used for Investing Activities | (1,557.7) | (1,439.2) | (1,359.0) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |
Net Cash Flows from Financing Activities | 420.1 | 443.9 | 433.3 |
Cash and Cash Equivalents at Beginning of Period | 0.0 | 0.0 | 0.0 |
Cash and Cash Equivalents at End of Period | 0.0 | 0.0 | 0.0 |
Cash Paid (Received) for: |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 179.9 | 158.8 | 132.9 |
Income Taxes | 87.6 | 95.5 | 65.7 |
Noncash Investing and Financing Activities: |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid | 177.6 | 320.7 | 358.7 |
Construction Expenditures Included in Current Liabilities as of December 31, | 177.6 | 320.7 | 358.7 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Issuance of Long-term Debt | 689.0 | 540.8 | 443.7 |
Repayments of Long-term Debt | 60.0 | 104.0 | 50.0 |
Net Income (Loss) | 614.2 | 594.2 | 591.7 |
Retained Earnings | 3,289.9 | 2,850.7 |  |
AEP Transmission Co [Member] | Retained Earnings [Member] |  |  |  |
Other Income (Expense) |  |  |  |
Net Income (Loss) | 614.2 | 594.2 | 591.7 |
Equity [Abstract] |  |  |  |
TOTAL MEMBER'S EQUITY | 3,289.9 | 2,850.7 | 2,426.5 | 1,947.3
Operating Activites |  |  |  |
Net Income (Loss) | 614.2 | 594.2 | 591.7 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Net Income (Loss) | 614.2 | 594.2 | 591.7 |
Appalachian Power Co [Member] |  |  |  |
Materials and Supplies | 148.4 | 130.6 |  |
Supplementary Information |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 571.1 | 576.1 | 547.0 |
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities | 0.8 | (0.2) | (0.8) |
Total Depreciation and Amortization | 571.9 | 575.9 | 546.2 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |
Cash and Cash Equivalents at Beginning of Period | 7.5 |  |  |
Restricted Cash | 14.9 | 14.4 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 19.9 | 21.9 | 20.1 | 22.7
Revenues |  |  |  |
TOTAL REVENUES | 3,720.7 | 3,519.9 | 3,105.2 |
Expenses |  |  |  |
Depreciation and Amortization | 571.9 | 575.9 | 546.2 |
TOTAL EXPENSES | 3,189.7 | 2,917.8 | 2,555.8 |
OPERATING INCOME (LOSS) | 531.0 | 602.1 | 549.4 |
Other Income (Expense) |  |  |  |
Allowance for Equity Funds Used During Construction | 11.9 | 11.7 | 15.6 |
Interest Expense | (269.6) | (233.9) | (214.0) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) | 308.6 | 412.4 | 371.0 |
Income Tax Expense (Benefit) | 14.2 | 18.2 | 22.1 |
Net Income (Loss) | 294.4 | 394.2 | 348.9 |
Accounts Receivable: |  |  |  |
Customers | 170.3 | 168.9 |  |
Total Accounts Receivable | 338.5 | 352.8 |  |
TOTAL CURRENT ASSETS | 1,059.0 | 1,259.6 |  |
Property, Plant and Equipment |  |  |  |
Transmission | 4,711.8 | 4,482.8 |  |
Other Property, Plant and Equipment | 981.3 | 883.3 |  |
Construction Work in Progress | 709.2 | 705.3 |  |
Total Property, Plant and Equipment | 18,620.2 | 17,781.2 |  |
Accumulated Depreciation and Amortization | 5,688.7 | 5,402.0 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET | 12,931.5 | 12,379.2 |  |
Other Noncurrent Assets |  |  |  |
TOTAL OTHER NONCURRENT ASSETS | 1,721.4 | 1,583.4 |  |
TOTAL ASSETS | 15,711.9 | 15,222.2 |  |
Current Liabilities |  |  |  |
Accounts Payable | 280.4 | 451.2 |  |
Accrued Taxes | 117.6 | 101.0 |  |
TOTAL CURRENT LIABILITIES | 1,685.9 | 1,390.2 |  |
Liabilities, Noncurrent |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits | 1,081.9 | 1,143.6 |  |
TOTAL NONCURRENT LIABILITIES | 8,749.3 | 8,856.6 |  |
TOTAL LIABILITIES | 10,435.2 | 10,246.8 |  |
Equity [Abstract] |  |  |  |
Retained Earnings | 3,185.5 | 2,891.1 |  |
TOTAL LIABILITIES AND EQUITY | 15,711.9 | 15,222.2 |  |
Operating Activites |  |  |  |
Net Income (Loss) | 294.4 | 394.2 | 348.9 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |
Depreciation and Amortization | 571.9 | 575.9 | 546.2 |
Deferred Income Taxes | (54.3) | 79.6 | 15.0 |
Allowance for Equity Funds Used During Construction | (11.9) | (11.7) | (15.6) |
Change in Other Noncurrent Assets | (115.3) | (75.2) | (68.8) |
Increase (Decrease) in Other Noncurrent Liabilities | (1.9) | 31.4 | 35.6 |
Accounts Receivable, Net | 17.5 | (8.5) | (53.3) |
Accounts Payable | (125.9) | 190.1 | 36.8 |
Accrued Taxes, Net | 25.2 | 6.7 | (16.2) |
Net Cash Flows from Operating Activities | 723.1 | 601.2 | 611.7 |
Investing Activities |  |  |  |
Net Cash Flows Used for Investing Activities | (1,054.9) | (1,005.2) | (826.5) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |
Net Cash Flows from Financing Activities | 329.8 | 405.8 | 212.2 |
Cash and Cash Equivalents at Beginning of Period | 7.5 |  |  |
Cash and Cash Equivalents at End of Period | 5.0 | 7.5 |  |
Cash Paid (Received) for: |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 259.7 | 215.1 | 207.5 |
Income Taxes | 47.4 | (88.6) | 32.8 |
Noncash Investing and Financing Activities: |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid | 100.7 | 164.6 | 139.1 |
Construction Expenditures Included in Current Liabilities as of December 31, | 100.7 | 164.6 | 139.1 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Issuance of Long-term Debt | 200.0 | 698.0 | 494.0 |
Repayments of Long-term Debt | 26.6 | 230.4 | 393.0 |
Net Income (Loss) | 294.4 | 394.2 | 348.9 |
Retained Earnings | 3,185.5 | 2,891.1 |  |
Appalachian Power Co [Member] | Retained Earnings [Member] |  |  |  |
Other Income (Expense) |  |  |  |
Net Income (Loss) | 294.4 | 394.2 | 348.9 |
Operating Activites |  |  |  |
Net Income (Loss) | 294.4 | 394.2 | 348.9 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Net Income (Loss) | $ 294.4 | 394.2 | 348.9 |
Appalachian Power Co [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 30.00% |  |  |
Appalachian Power Co [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 54.00% |  |  |
Appalachian Power Co [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 15.00% |  |  |
Appalachian Power Co [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Appalachian Power Co [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 58.00% |  |  |
Appalachian Power Co [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 41.00% |  |  |
Appalachian Power Co [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Appalachian Power Co [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |
Supplementary Information |  |  |  |
Securities Loaned | $ 62.0 | 83.0 |  |
Indiana Michigan Power Co [Member] |  |  |  |
Materials and Supplies | 208.2 | 188.1 |  |
Supplementary Information |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 439.8 | 511.9 | 424.9 |
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities | 30.2 | 15.3 | 21.1 |
Total Depreciation and Amortization | 470.0 | 527.2 | 446.0 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |
Cash and Cash Equivalents at Beginning of Period | 4.2 | 1.3 | 3.3 |
Revenues |  |  |  |
TOTAL REVENUES | 2,535.9 | 2,669.6 | 2,326.7 |
Expenses |  |  |  |
Depreciation and Amortization | 470.0 | 527.2 | 446.0 |
TOTAL EXPENSES | 2,048.2 | 2,249.7 | 1,968.8 |
OPERATING INCOME (LOSS) | 487.7 | 419.9 | 357.9 |
Other Income (Expense) |  |  |  |
Allowance for Equity Funds Used During Construction | 10.9 | 9.8 | 12.8 |
Interest Expense | (136.7) | (125.2) | (116.8) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) | 394.5 | 328.9 | 269.2 |
Income Tax Expense (Benefit) | 58.6 | 4.2 | (10.6) |
Net Income (Loss) | 335.9 | 324.7 | 279.8 |
Accounts Receivable: |  |  |  |
Customers | 66.9 | 96.6 |  |
Total Accounts Receivable | 140.3 | 205.8 |  |
TOTAL CURRENT ASSETS | 528.0 | 571.8 |  |
Property, Plant and Equipment |  |  |  |
Transmission | 1,906.4 | 1,842.2 |  |
Other Property, Plant and Equipment | 898.5 | 839.3 |  |
Construction Work in Progress | 301.7 | 253.0 |  |
Total Property, Plant and Equipment | 12,007.4 | 11,544.3 |  |
Accumulated Depreciation and Amortization | 4,378.4 | 4,132.8 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET | 7,629.0 | 7,411.5 |  |
Other Noncurrent Assets |  |  |  |
TOTAL OTHER NONCURRENT ASSETS | 4,651.0 | 4,135.6 |  |
TOTAL ASSETS | 12,808.0 | 12,118.9 |  |
Current Liabilities |  |  |  |
Accounts Payable | 225.8 | 173.4 |  |
Accrued Taxes | 104.7 | 103.2 |  |
TOTAL CURRENT LIABILITIES | 830.2 | 1,197.1 |  |
Liabilities, Noncurrent |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits | 2,052.3 | 1,702.2 |  |
TOTAL NONCURRENT LIABILITIES | 8,837.6 | 7,913.5 |  |
TOTAL LIABILITIES | 9,667.8 | 9,110.6 |  |
Equity [Abstract] |  |  |  |
Retained Earnings | 2,086.6 | 1,963.2 |  |
TOTAL LIABILITIES AND EQUITY | 12,808.0 | 12,118.9 |  |
Operating Activites |  |  |  |
Net Income (Loss) | 335.9 | 324.7 | 279.8 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |
Depreciation and Amortization | 470.0 | 527.2 | 446.0 |
Deferred Income Taxes | (54.1) | (45.1) | (38.0) |
Allowance for Equity Funds Used During Construction | (10.9) | (9.8) | (12.8) |
Change in Other Noncurrent Assets | (80.3) | (47.3) | (54.1) |
Increase (Decrease) in Other Noncurrent Liabilities | 47.6 | 62.4 | 7.5 |
Accounts Receivable, Net | 71.4 | (82.7) | (22.3) |
Accounts Payable | 22.5 | 37.3 | 42.3 |
Accrued Taxes, Net | 1.5 | 9.4 | 1.6 |
Net Cash Flows from Operating Activities | 879.9 | 720.7 | 733.7 |
Investing Activities |  |  |  |
Net Cash Flows Used for Investing Activities | (707.0) | (701.5) | (633.1) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |
Net Cash Flows from Financing Activities | (175.0) | (16.3) | (102.6) |
Cash and Cash Equivalents at Beginning of Period | 4.2 | 1.3 | 3.3 |
Cash and Cash Equivalents at End of Period | 2.1 | 4.2 | 1.3 |
Cash Paid (Received) for: |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 131.6 | 120.9 | 110.9 |
Income Taxes | 109.0 | 10.1 | 29.3 |
Noncash Investing and Financing Activities: |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid | 67.8 | 71.9 | 87.8 |
Construction Expenditures Included in Current Liabilities as of December 31, | 67.8 | 71.9 | 87.8 |
Acquisition of Nuclear Fuel Included in Current Liabilities as of December 31, | 24.2 | 0.0 | 0.0 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Issuance of Long-term Debt | 565.3 | 142.7 | 546.7 |
Repayments of Long-term Debt | 343.3 | 83.4 | 383.5 |
Net Income (Loss) | 335.9 | 324.7 | 279.8 |
Retained Earnings | 2,086.6 | 1,963.2 |  |
Indiana Michigan Power Co [Member] | Retained Earnings [Member] |  |  |  |
Other Income (Expense) |  |  |  |
Net Income (Loss) | 335.9 | 324.7 | 279.8 |
Operating Activites |  |  |  |
Net Income (Loss) | 335.9 | 324.7 | 279.8 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Net Income (Loss) | $ 335.9 | 324.7 | 279.8 |
Indiana Michigan Power Co [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 30.00% |  |  |
Indiana Michigan Power Co [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 54.00% |  |  |
Indiana Michigan Power Co [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 15.00% |  |  |
Indiana Michigan Power Co [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Indiana Michigan Power Co [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 58.00% |  |  |
Indiana Michigan Power Co [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 41.00% |  |  |
Indiana Michigan Power Co [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Indiana Michigan Power Co [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |
Supplementary Information |  |  |  |
Securities Loaned | $ 62.0 | 83.0 |  |
Ohio Power Co [Member] |  |  |  |
Materials and Supplies | 175.0 | 109.5 |  |
Supplementary Information |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 315.8 | 293.1 | 301.1 |
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities | 0.4 | 1.2 | 2.2 |
Total Depreciation and Amortization | 316.2 | 294.3 | 303.3 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |
Cash and Cash Equivalents at Beginning of Period | 9.6 |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 6.4 | 9.6 | 3.0 | $ 7.4
Revenues |  |  |  |
TOTAL REVENUES | 3,811.4 | 3,665.1 | 2,899.1 |
Expenses |  |  |  |
Depreciation and Amortization | 316.2 | 294.3 | 303.3 |
TOTAL EXPENSES | 3,341.5 | 3,251.4 | 2,513.9 |
OPERATING INCOME (LOSS) | 469.9 | 413.7 | 385.2 |
Other Income (Expense) |  |  |  |
Allowance for Equity Funds Used During Construction | 17.1 | 13.9 | 10.8 |
Interest Expense | (130.9) | (119.6) | (124.4) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) | 382.5 | 331.4 | 288.0 |
Income Tax Expense (Benefit) | 54.3 | 44.2 | 34.4 |
Net Income (Loss) | 328.2 | 287.8 | 253.6 |
Accounts Receivable: |  |  |  |
Customers | 39.2 | 119.9 |  |
Total Accounts Receivable | 170.7 | 238.6 |  |
TOTAL CURRENT ASSETS | 377.8 | 414.4 |  |
Property, Plant and Equipment |  |  |  |
Transmission | 3,395.1 | 3,198.6 |  |
Other Property, Plant and Equipment | 1,125.0 | 1,051.4 |  |
Construction Work in Progress | 654.0 | 474.3 |  |
Total Property, Plant and Equipment | 12,013.5 | 11,174.6 |  |
Accumulated Depreciation and Amortization | 2,713.6 | 2,565.3 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET | 9,299.9 | 8,609.3 |  |
Other Noncurrent Assets |  |  |  |
TOTAL OTHER NONCURRENT ASSETS | 1,166.0 | 979.4 |  |
TOTAL ASSETS | 10,843.7 | 10,003.1 |  |
Current Liabilities |  |  |  |
Accounts Payable | 320.7 | 337.3 |  |
Accrued Taxes | 763.3 | 733.1 |  |
TOTAL CURRENT LIABILITIES | 1,614.3 | 1,635.5 |  |
Liabilities, Noncurrent |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits | 1,003.6 | 1,044.0 |  |
TOTAL NONCURRENT LIABILITIES | 5,658.1 | 5,279.5 |  |
TOTAL LIABILITIES | 7,272.4 | 6,915.0 |  |
Equity [Abstract] |  |  |  |
Retained Earnings | 2,237.3 | 1,929.1 |  |
TOTAL LIABILITIES AND EQUITY | 10,843.7 | 10,003.1 |  |
Operating Activites |  |  |  |
Net Income (Loss) | 328.2 | 287.8 | 253.6 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |
Depreciation and Amortization | 316.2 | 294.3 | 303.3 |
Deferred Income Taxes | 7.9 | 71.5 | 30.7 |
Allowance for Equity Funds Used During Construction | (17.1) | (13.9) | (10.8) |
Amortization of Deferred Property Taxes | (11.5) | (20.0) | (35.3) |
Change in Other Noncurrent Assets | (137.5) | (87.1) | (40.7) |
Increase (Decrease) in Other Noncurrent Liabilities | (0.4) | 91.1 | 6.9 |
Accounts Receivable, Net | 72.8 | (83.7) | (11.8) |
Accounts Payable | 23.6 | 112.7 | 19.1 |
Accrued Taxes, Net | 27.5 | 27.8 | 78.2 |
Net Cash Flows from Operating Activities | 462.3 | 686.1 | 575.6 |
Investing Activities |  |  |  |
Net Cash Flows Used for Investing Activities | (949.4) | (802.5) | (753.3) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |
Net Cash Flows from Financing Activities | 483.9 | 123.0 | 173.3 |
Cash and Cash Equivalents at Beginning of Period | 9.6 |  |  |
Cash and Cash Equivalents at End of Period | 6.4 | 9.6 |  |
Cash Paid (Received) for: |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 124.1 | 113.4 | 119.5 |
Income Taxes | 38.9 | (19.7) | (7.9) |
Noncash Investing and Financing Activities: |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid | 97.7 | 109.7 | 97.1 |
Construction Expenditures Included in Current Liabilities as of December 31, | 97.7 | 109.7 | 97.1 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Issuance of Long-term Debt | 395.0 | 0.0 | 1,037.1 |
Repayments of Long-term Debt | 0.6 | 0.1 | 500.1 |
Income (Loss) from Equity Method Investment | 0.0 | 0.6 | 0.0 |
Net Income (Loss) | 328.2 | 287.8 | 253.6 |
Retained Earnings | 2,237.3 | 1,929.1 |  |
Ohio Power Co [Member] | Retained Earnings [Member] |  |  |  |
Other Income (Expense) |  |  |  |
Net Income (Loss) | 328.2 | 287.8 | 253.6 |
Operating Activites |  |  |  |
Net Income (Loss) | 328.2 | 287.8 | 253.6 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Net Income (Loss) | $ 328.2 | 287.8 | 253.6 |
Ohio Power Co [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 30.00% |  |  |
Ohio Power Co [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 54.00% |  |  |
Ohio Power Co [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 15.00% |  |  |
Ohio Power Co [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Ohio Power Co [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 58.00% |  |  |
Ohio Power Co [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 41.00% |  |  |
Ohio Power Co [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Ohio Power Co [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |
Supplementary Information |  |  |  |
Securities Loaned | $ 62.0 | 83.0 |  |
Public Service Co Of Oklahoma [Member] |  |  |  |
Materials and Supplies | 106.9 | 111.1 |  |
Supplementary Information |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 240.3 | 226.2 | 185.9 |
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities | 15.2 | 3.9 | 10.7 |
Total Depreciation and Amortization | 255.5 | 230.1 | 196.6 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |
Cash and Cash Equivalents at Beginning of Period | 4.0 | 1.3 | 2.6 |
Revenues |  |  |  |
TOTAL REVENUES | 1,977.0 | 1,874.7 | 1,474.4 |
Expenses |  |  |  |
Depreciation and Amortization | 255.5 | 230.1 | 196.6 |
TOTAL EXPENSES | 1,742.7 | 1,693.9 | 1,281.5 |
OPERATING INCOME (LOSS) | 234.3 | 180.8 | 192.9 |
Other Income (Expense) |  |  |  |
Allowance for Equity Funds Used During Construction | 8.4 | 1.5 | 2.4 |
Interest Expense | (103.6) | (83.8) | (62.9) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) | 155.2 | 118.4 | 145.2 |
Income Tax Expense (Benefit) | (53.6) | (49.2) | 4.1 |
Net Income (Loss) | 208.8 | 167.6 | 141.1 |
Accounts Receivable: |  |  |  |
Customers | 107.6 | 70.1 |  |
Total Accounts Receivable | 139.4 | 123.1 |  |
Accrued Tax Benefits | 31.0 | 16.1 |  |
TOTAL CURRENT ASSETS | 469.5 | 491.5 |  |
Property, Plant and Equipment |  |  |  |
Transmission | 1,228.3 | 1,164.4 |  |
Other Property, Plant and Equipment | 505.9 | 469.3 |  |
Construction Work in Progress | 313.7 | 219.3 |  |
Total Property, Plant and Equipment | 8,194.2 | 7,464.2 |  |
Accumulated Depreciation and Amortization | 2,081.9 | 1,837.7 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET | 6,112.3 | 5,626.5 |  |
Other Noncurrent Assets |  |  |  |
TOTAL OTHER NONCURRENT ASSETS | 753.1 | 847.9 |  |
TOTAL ASSETS | 7,334.9 | 6,965.9 |  |
Current Liabilities |  |  |  |
Accounts Payable | 159.3 | 202.9 |  |
Accrued Taxes | 30.7 | 28.7 |  |
TOTAL CURRENT LIABILITIES | 559.0 | 842.7 |  |
Liabilities, Noncurrent |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits | 765.6 | 809.1 |  |
TOTAL NONCURRENT LIABILITIES | 4,205.3 | 3,704.1 |  |
TOTAL LIABILITIES | 4,764.3 | 4,546.8 |  |
Equity [Abstract] |  |  |  |
Retained Earnings | 1,374.3 | 1,218.0 |  |
TOTAL LIABILITIES AND EQUITY | 7,334.9 | 6,965.9 |  |
Operating Activites |  |  |  |
Net Income (Loss) | 208.8 | 167.6 | 141.1 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |
Depreciation and Amortization | 255.5 | 230.1 | 196.6 |
Deferred Income Taxes | 7.9 | (59.4) | 113.9 |
Allowance for Equity Funds Used During Construction | (8.4) | (1.5) | (2.4) |
Change in Other Noncurrent Assets | (71.3) | (40.1) | (14.8) |
Increase (Decrease) in Other Noncurrent Liabilities | 8.2 | 29.9 | 4.4 |
Accounts Receivable, Net | (16.3) | (46.0) | (28.7) |
Accounts Payable | (58.2) | 57.5 | 34.2 |
Accrued Taxes, Net | (12.9) | 3.2 | (6.5) |
Net Cash Flows from Operating Activities | 590.5 | 747.7 | (433.3) |
Investing Activities |  |  |  |
Net Cash Flows Used for Investing Activities | (692.8) | (992.0) | (626.7) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |
Net Cash Flows from Financing Activities | 100.8 | 247.0 | 1,058.7 |
Cash and Cash Equivalents at Beginning of Period | 4.0 | 1.3 | 2.6 |
Cash and Cash Equivalents at End of Period | 2.5 | 4.0 | 1.3 |
Cash Paid (Received) for: |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 87.3 | 79.7 | 57.0 |
Income Taxes | (10.6) | (12.5) | (102.9) |
Cash Received from the Sale of Transferable Tax Credits | (34.6) | 0.0 | 0.0 |
Noncash Investing and Financing Activities: |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid | 72.9 | 69.8 | 56.8 |
Construction Expenditures Included in Current Liabilities as of December 31, | 72.9 | 69.8 | 56.8 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Issuance of Long-term Debt | 469.8 | 499.7 | 1,290.0 |
Repayments of Long-term Debt | 0.5 | 500.5 | 750.5 |
Net Income (Loss) | 208.8 | 167.6 | 141.1 |
Retained Earnings | 1,374.3 | 1,218.0 |  |
Public Service Co Of Oklahoma [Member] | Retained Earnings [Member] |  |  |  |
Other Income (Expense) |  |  |  |
Net Income (Loss) | 208.8 | 167.6 | 141.1 |
Operating Activites |  |  |  |
Net Income (Loss) | 208.8 | 167.6 | 141.1 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Net Income (Loss) | $ 208.8 | 167.6 | 141.1 |
Public Service Co Of Oklahoma [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 30.00% |  |  |
Public Service Co Of Oklahoma [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 54.00% |  |  |
Public Service Co Of Oklahoma [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 15.00% |  |  |
Public Service Co Of Oklahoma [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Public Service Co Of Oklahoma [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 58.00% |  |  |
Public Service Co Of Oklahoma [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 41.00% |  |  |
Public Service Co Of Oklahoma [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Public Service Co Of Oklahoma [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |
Supplementary Information |  |  |  |
Securities Loaned | $ 62.0 | 83.0 |  |
Southwestern Electric Power Co [Member] |  |  |  |
Materials and Supplies | 88.4 | 92.1 |  |
Supplementary Information |  |  |  |
Depreciation and Amortization of Property, Plant and Equipment | 323.4 | 319.3 | 292.9 |
Amortization of Certain Securitized Assets | 0.0 | 0.0 | 0.0 |
Amortization of Regulatory Assets and Liabilities | 19.4 | 5.5 | 2.1 |
Total Depreciation and Amortization | 342.8 | 324.8 | 295.0 |
Cash, Cash Equivalents and Restricted Cash |  |  |  |
Cash and Cash Equivalents at Beginning of Period | 88.4 | 51.2 | 13.2 |
Amounts Attributable to AEP Common Shareholders |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interests | 3.5 | 4.2 | 3.1 |
Net Income (Loss) | 220.3 | 290.1 | 239.0 |
Revenues |  |  |  |
TOTAL REVENUES | 2,182.8 | 2,284.4 | 2,131.8 |
Expenses |  |  |  |
Depreciation and Amortization | 342.8 | 324.8 | 295.0 |
TOTAL EXPENSES | 1,890.5 | 1,914.4 | 1,792.3 |
OPERATING INCOME (LOSS) | 292.3 | 370.0 | 339.5 |
Other Income (Expense) |  |  |  |
Allowance for Equity Funds Used During Construction | 11.5 | 4.9 | 7.0 |
Interest Expense | (147.2) | (137.4) | (125.9) |
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY EARNINGS (LOSS) | 189.1 | 267.7 | 238.1 |
Income Tax Expense (Benefit) | (33.3) | (25.2) | (0.6) |
Net Income (Loss) | 223.8 | 294.3 | 242.1 |
Accounts Receivable: |  |  |  |
Customers | 39.0 | 38.8 |  |
Total Accounts Receivable | 94.5 | 114.6 |  |
Accrued Tax Benefits | 28.4 | 16.5 |  |
TOTAL CURRENT ASSETS | 541.3 | 812.2 |  |
Property, Plant and Equipment |  |  |  |
Transmission | 2,660.6 | 2,479.8 |  |
Other Property, Plant and Equipment | 814.4 | 804.4 |  |
Construction Work in Progress | 555.8 | 369.5 |  |
Total Property, Plant and Equipment | 11,645.6 | 11,789.5 |  |
Accumulated Depreciation and Amortization | 3,087.2 | 3,527.3 |  |
TOTAL PROPERTY, PLANT AND EQUIPMENT - NET | 8,558.4 | 8,262.2 |  |
Other Noncurrent Assets |  |  |  |
TOTAL OTHER NONCURRENT ASSETS | 1,457.9 | 1,304.4 |  |
TOTAL ASSETS | 10,557.6 | 10,378.8 |  |
Current Liabilities |  |  |  |
Accounts Payable | 198.9 | 213.1 |  |
Accrued Taxes | 58.7 | 52.8 |  |
TOTAL CURRENT LIABILITIES | 686.9 | 947.7 |  |
Liabilities, Noncurrent |  |  |  |
Regulatory Liabilities and Deferred Investment Tax Credits | 756.1 | 825.7 |  |
TOTAL NONCURRENT LIABILITIES | 6,100.3 | 5,756.3 |  |
TOTAL LIABILITIES | 6,787.2 | 6,704.0 |  |
Equity [Abstract] |  |  |  |
Retained Earnings | 2,281.3 | 2,236.0 |  |
TOTAL LIABILITIES AND EQUITY | 10,557.6 | 10,378.8 |  |
Operating Activites |  |  |  |
Net Income (Loss) | 223.8 | 294.3 | 242.1 |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |  |
Depreciation and Amortization | 342.8 | 324.8 | 295.0 |
Deferred Income Taxes | 54.0 | 9.4 | 16.6 |
Allowance for Equity Funds Used During Construction | (11.5) | (4.9) | (7.0) |
Change in Other Noncurrent Assets | (40.5) | 42.9 | 41.9 |
Increase (Decrease) in Other Noncurrent Liabilities | 11.0 | 18.3 | (1.1) |
Accounts Receivable, Net | 20.1 | (28.2) | (21.5) |
Accounts Payable | (8.4) | 34.1 | 22.0 |
Accrued Taxes, Net | (4.5) | 9.8 | 15.4 |
Net Cash Flows from Operating Activities | 803.0 | 586.6 | 96.8 |
Investing Activities |  |  |  |
Net Cash Flows Used for Investing Activities | (776.7) | (1,085.1) | (920.7) |
Net Cash Provided by (Used in) Financing Activities |  |  |  |
Net Cash Flows from Financing Activities | (112.3) | 535.7 | 861.9 |
Cash and Cash Equivalents at Beginning of Period | 88.4 | 51.2 | 13.2 |
Cash and Cash Equivalents at End of Period | 2.4 | 88.4 | 51.2 |
Cash Paid (Received) for: |  |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 128.9 | 131.2 | 116.5 |
Income Taxes | (41.0) | (29.1) | (28.8) |
Cash Received from the Sale of Transferable Tax Credits | (41.4) | 0.0 | 0.0 |
Noncash Investing and Financing Activities: |  |  |  |
Construction in Progress Expenditures Incurred but Not yet Paid | 63.7 | 105.6 | 69.0 |
Construction Expenditures Included in Current Liabilities as of December 31, | 63.7 | 105.6 | 69.0 |
Organization and Summary of Significant Accounting Policies (Textuals) |  |  |  |
Issuance of Long-term Debt | 346.8 | 0.0 | 1,137.6 |
Repayments of Long-term Debt | 94.1 | 6.2 | 381.2 |
Income (Loss) from Equity Method Investment | 1.4 | 1.4 | 3.4 |
Net Income (Loss) | 223.8 | 294.3 | 242.1 |
Retained Earnings | 2,281.3 | 2,236.0 |  |
Southwestern Electric Power Co [Member] | Retained Earnings [Member] |  |  |  |
Amounts Attributable to AEP Common Shareholders |  |  |  |
Net Income (Loss) | $ 220.3 | 290.1 | $ 239.0 |
Southwestern Electric Power Co [Member] | Pension Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 30.00% |  |  |
Southwestern Electric Power Co [Member] | Pension Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 54.00% |  |  |
Southwestern Electric Power Co [Member] | Pension Plans [Member] | Other Investments [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 15.00% |  |  |
Southwestern Electric Power Co [Member] | Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Southwestern Electric Power Co [Member] | Other Postretirement Benefit Plans [Member] | Equity [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 58.00% |  |  |
Southwestern Electric Power Co [Member] | Other Postretirement Benefit Plans [Member] | Fixed Income [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 41.00% |  |  |
Southwestern Electric Power Co [Member] | Other Postretirement Benefit Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Target Asset Allocations |  |  |  |
Target Asset Allocation | 1.00% |  |  |
Southwestern Electric Power Co [Member] | Pension and Other Postretirement Benefit Plans [Member] |  |  |  |
Supplementary Information |  |  |  |
Securities Loaned | $ 62.0 | $ 83.0 |  |
Restricted Stock Units and Performance Share Units [Member] |  |  |  |
Weighted Average Dilutive Effect of: |  |  |  |
Weighted Average Dilutive Effect of Shares | 1,300,000 | 1,700,000 | 1,300,000 |
Dilutive Securities, Effect on Basic Earnings Per Share | $ (0.02) | $ (0.02) | $ (0.01) |
Revenues [Member] | AEP Texas Inc. [Member] | Credit Concentration Risk |  |  |  |
Risks and Uncertainties |  |  |  |
Percentage of Significant Customers Concentration Risk | 41.00% | 45.00% | 43.00% |
Revenues [Member] | AEP Transmission Co [Member] | Credit Concentration Risk |  |  |  |
Risks and Uncertainties |  |  |  |
Percentage of Significant Customers Concentration Risk | 79.00% | 79.00% | 79.00% |
Revenues [Member] | Appalachian Power Co [Member] | Credit Concentration Risk |  |  |  |
Risks and Uncertainties |  |  |  |
Percentage of Significant Customers Concentration Risk | 10.00% | 10.00% | 10.00% |
Revenues [Member] | Indiana Michigan Power Co [Member] | Credit Concentration Risk |  |  |  |
Risks and Uncertainties |  |  |  |
Percentage of Significant Customers Concentration Risk | 10.00% | 10.00% | 10.00% |
Revenues [Member] | Ohio Power Co [Member] | Credit Concentration Risk |  |  |  |
Risks and Uncertainties |  |  |  |
Percentage of Significant Customers Concentration Risk | 10.00% | 10.00% | 10.00% |
Revenues [Member] | Public Service Co Of Oklahoma [Member] | Credit Concentration Risk |  |  |  |
Risks and Uncertainties |  |  |  |
Percentage of Significant Customers Concentration Risk | 10.00% | 10.00% | 10.00% |
Revenues [Member] | Southwestern Electric Power Co [Member] | Credit Concentration Risk |  |  |  |
Risks and Uncertainties |  |  |  |
Percentage of Significant Customers Concentration Risk | 10.00% | 10.00% | 10.00% |
Accounts Receivable [Member] | AEP Texas Inc. [Member] | Credit Concentration Risk |  |  |  |
Risks and Uncertainties |  |  |  |
Percentage of Significant Customers Concentration Risk | 34.00% | 42.00% | 41.00% |
Accounts Receivable [Member] | AEP Transmission Co [Member] | Credit Concentration Risk |  |  |  |
Risks and Uncertainties |  |  |  |
Percentage of Significant Customers Concentration Risk | 60.00% | 72.00% | 81.00% |
Noncontrolling Interest [Member] | Dry Lake Solar Project [Member] |  |  |  |
Noncash Investing and Financing Activities: |  |  |  |
Noncash Contribution of Assets by Noncontrolling Interest | $ 0.0 | $ 0.0 | $ 35.3 |
Sabine Mining Co [Member] | Southwestern Electric Power Co [Member] |  |  |  |
Materials and Supplies | 3.9 | 4.2 |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |
Cash and Cash Equivalents at Beginning of Period | 84.2 |  |  |
Property, Plant and Equipment |  |  |  |
Other Property, Plant and Equipment | 182.7 | 219.8 |  |
Accumulated Depreciation and Amortization | 182.7 | 212.5 |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |
Cash and Cash Equivalents at Beginning of Period | 84.2 |  |  |
Cash and Cash Equivalents at End of Period | $ 0.0 | $ 84.2 |  |

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