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Consolidated Statements of Cash Flows - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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
Rockport Plant, Unit 2 Lease Amortization | 0.0 | 0.0 | 135.4
Deferred Income Taxes | 185.1 | (137.2) | 107.6
Asset Impairments and Other Related Charges | 85.6 | 48.8 | 11.6
Equity Method Investment, Other than Temporary Impairment | 19.0 | 188.0 | 0.0
Allowance for Equity Funds Used During Construction | (174.9) | (133.7) | (139.7)
Mark-to-Market of Risk Management Contracts | 8.8 | 15.5 | 112.3
Amortization of Nuclear Fuel | 96.6 | 82.9 | 85.3
Property Taxes | (41.1) | (41.2) | (68.0)
Deferred Fuel Over/Under-Recovery, Net | 892.8 | (319.2) | (1,647.9)
Establishment of 2017-2019 Virginia Triennial Review Regulatory Asset | 0.0 | (37.0) | 0.0
Gain (Loss) on Disposition Assets |  | (116.3) |
Change in Regulatory Assets | (315.8) | (46.7) | (238.9)
Change in Other Noncurrent Assets | (465.1) | (187.7) | (126.6)
Change in Other Noncurrent Liabilities | 29.0 | 337.8 | 206.4
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | 236.5 | (681.7) | (119.7)
Fuel, Materials and Supplies | (504.0) | (313.9) | 300.2
Accounts Payable | (253.2) | 489.2 | 200.6
Accrued Taxes, Net | 22.5 | 105.4 | 218.7
Rockport Plant, Unit 2 Operating Lease Payments | 0.0 | 0.0 | (147.7)
Other Current Assets | (43.9) | 109.0 | (151.3)
Other Current Liabilities | (161.4) | 54.3 | (212.2)
Net Cash Flows from Operating Activities | 5,012.2 | 5,288.0 | 3,839.9
Investing Activities |  |  |
Construction Expenditures | (7,378.3) | (6,671.7) | (5,659.6)
Purchases of Investment Securities | (2,863.6) | (2,784.2) | (1,955.1)
Sales of Investment Securities | 2,795.1 | 2,743.8 | 1,901.4
Acquisitions of Nuclear Fuel | (128.2) | (100.7) | (104.5)
Acquisition | 1,341.4 | 218.0 | (118.9)
Other Investing Activities | 122.1 | 50.3 | 32.2
Net Cash Flows Used for Investing Activities | (6,266.7) | (7,751.8) | (6,433.9)
Financing Activities |  |  |
Issuance of Common Stock, Net | 999.6 | 826.5 | 600.5
Issuance of Long-term Debt | 5,462.8 | 4,649.7 | 6,486.3
Issuance of Short-term Debt with Original Maturities Greater Than 90 Days | 1,069.9 | 833.9 | 1,393.3
Change in Short-term Debt with Original Maturities Less Than 90 Days, Net | (1,223.1) | 1,650.4 | (487.3)
Retirement of Long-term Debt | (2,196.1) | (2,345.4) | (2,989.3)
Redemption of Short-term Debt with Original Maturities Greater Than 90 Days | (1,128.8) | (986.1) | (771.3)
Principal Payments for Finance Lease Obligations | (68.3) | (309.5) | (64.0)
Dividends Paid on Common Stock - Nonaffiliated | (1,760.4) | (1,645.2) | (1,519.5)
Other Financing Activities | (78.6) | (105.4) | (41.6)
Net Cash Flows from Financing Activities | 1,077.0 | 2,568.9 | 2,607.1
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | (177.5) | 105.1 | 13.1
Cash, Cash Equivalents and Restricted Cash at Beginning of Period | 556.5 | 451.4 | 438.3
Cash and Cash Equivalents at Beginning of Period | 509.4 |  |
Cash, Cash Equivalents and Restricted Cash at End of Period | 379.0 | 556.5 | 451.4
Cash and Cash Equivalents at End of Period | 330.1 | 509.4 |
Supplementary Information |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 1,673.5 | 1,286.3 | 1,137.2
Net Cash Paid (Received) for Income Taxes | 78.4 | 116.8 | 13.2
Cash Received from the Sale of Transferable Tax Credits | (102.0) | 0.0 | 0.0
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
Kentucky Power Co [Member] |  |  |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |
Asset Impairments and Other Related Charges | 0.0 | 363.3 | 0.0
Mineral Rights |  |  |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |
Gain (Loss) on Disposition Assets | 0.0 | (116.3) | 0.0
Competitive Contracted Renewables |  |  |
Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: |  |  |
Gain (Loss) on Disposition Assets | 92.7 | 0.0 | 0.0
Renewable Energy Facilities |  |  |
Investing Activities |  |  |
Acquisitions of Renewable Energy Facilities | (155.2) | (1,207.3) | (767.2)
AEP Texas Inc. [Member] |  |  |
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)
Mark-to-Market of Risk Management Contracts | 0.4 | (0.4) | 0.0
Change in Other Noncurrent Assets | (96.5) | (36.2) | (78.2)
Change in Other Noncurrent Liabilities | 24.3 | 57.6 | 26.4
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | (28.3) | (45.0) | (21.6)
Fuel, Materials and Supplies | (51.6) | (64.9) | (3.9)
Accounts Payable | (24.1) | 25.0 | 8.9
Accrued Taxes, Net | 11.8 | 14.8 | 7.0
Other Current Assets | 3.0 | 2.2 | (0.9)
Other Current Liabilities | (53.9) | (4.0) | (39.4)
Net Cash Flows from Operating Activities | 659.7 | 731.9 | 596.6
Investing Activities |  |  |
Construction Expenditures | (1,477.1) | (1,305.0) | (1,033.3)
Change in Advances to Affiliates, Net | (0.2) | 0.0 | 0.2
Other Investing Activities | 69.3 | 35.1 | 32.3
Net Cash Flows Used for Investing Activities | (1,408.0) | (1,269.9) | (1,000.8)
Financing Activities |  |  |
Capital Contributions from Member | 527.0 | 4.3 | 96.0
Return of Capital to Parent Cash Flows | (5.6) | 0.0 | 0.0
Issuance of Long-term Debt | 505.4 | 1,188.6 | 444.2
Change in Advances from Affiliates, Net | 7.2 | 69.6 | (40.2)
Retirement of Long-term Debt | (278.5) | (716.0) | (88.7)
Principal Payments for Finance Lease Obligations | (7.4) | (6.8) | (6.7)
Other Financing Activities | 1.5 | 0.6 | 1.3
Net Cash Flows from Financing Activities | 749.6 | 540.3 | 405.9
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | 1.3 | 2.3 | 1.7
Cash, Cash Equivalents and Restricted Cash at Beginning of Period | 32.8 | 30.5 | 28.8
Cash and Cash Equivalents at Beginning of Period | 0.1 |  |
Cash, Cash Equivalents and Restricted Cash at End of Period | 34.1 | 32.8 | 30.5
Cash and Cash Equivalents at End of Period | 0.1 | 0.1 |
Supplementary Information |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 225.6 | 198.9 | 168.9
Net Cash Paid (Received) for Income Taxes | 11.5 | 11.0 | 5.7
Noncash Acquisitions Under Finance Leases | 4.8 | 6.1 | 4.4
Construction Expenditures Included in Current Liabilities as of December 31, | 112.2 | 235.4 | 230.0
AEP Transmission Co [Member] |  |  |
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)
Property Taxes | (19.8) | (20.9) | (25.6)
Change in Other Noncurrent Assets | 8.6 | (7.4) | 7.5
Change in Other Noncurrent Liabilities | 134.2 | 68.7 | 3.7
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | (41.3) | (46.3) | (16.0)
Fuel, Materials and Supplies | 10.7 | (1.4) | (0.8)
Accounts Payable | 22.8 | 18.5 | (2.2)
Accrued Taxes, Net | 42.9 | 50.2 | 67.2
Accrued Interest | 10.8 | 0.0 | 4.8
Other Current Assets | (0.1) | (1.1) | 1.2
Other Current Liabilities | (0.1) | 3.0 | (4.4)
Net Cash Flows from Operating Activities | 1,137.6 | 995.3 | 925.7
Investing Activities |  |  |
Construction Expenditures | (1,496.2) | (1,458.5) | (1,424.8)
Change in Advances to Affiliates, Net | (62.7) | 22.8 | 81.9
Acquisitions of Renewable Energy Facilities | (6.9) | (9.8) | (17.9)
Other Investing Activities | 8.1 | 6.3 | 1.8
Net Cash Flows Used for Investing Activities | (1,557.7) | (1,439.2) | (1,359.0)
Financing Activities |  |  |
Capital Contributions from Member | 29.7 | 72.7 | 184.0
Return of Capital to Parent Cash Flows | (8.6) | 0.0 | 0.0
Issuance of Long-term Debt | 689.0 | 540.8 | 443.7
Change in Advances from Affiliates, Net | (55.0) | 104.4 | (31.9)
Retirement of Long-term Debt | (60.0) | (104.0) | (50.0)
Principal Payments for Finance Lease Obligations | 0.0 | 0.0 |
Dividends Paid on Common Stock | (175.0) | (170.0) | (112.5)
Net Cash Flows from Financing Activities | 420.1 | 443.9 | 433.3
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | 0.0 | 0.0 | 0.0
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
Supplementary Information |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 179.9 | 158.8 | 132.9
Net Cash Paid (Received) for Income Taxes | 87.6 | 95.5 | 65.7
Construction Expenditures Included in Current Liabilities as of December 31, | 177.6 | 320.7 | 358.7
Appalachian Power Co [Member] |  |  |
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
Asset Impairments and Other Related Charges | 0.0 | 24.9 | 0.0
Allowance for Equity Funds Used During Construction | (11.9) | (11.7) | (15.6)
Mark-to-Market of Risk Management Contracts | 65.6 | (24.4) | (22.3)
Deferred Fuel Over/Under-Recovery, Net | 279.7 | (501.8) | (196.0)
Establishment of 2017-2019 Virginia Triennial Review Regulatory Asset | 0.0 | (37.0) | 0.0
Change in Other Noncurrent Assets | (115.3) | (75.2) | (68.8)
Change in Other Noncurrent Liabilities | (1.9) | 31.4 | 35.6
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | 17.5 | (8.5) | (53.3)
Fuel, Materials and Supplies | (173.9) | (113.5) | 116.1
Increase (Decrease) in Margin Deposits Outstanding | (16.1) | 64.4 | (70.0)
Accounts Payable | (125.9) | 190.1 | 36.8
Accrued Taxes, Net | 25.2 | 6.7 | (16.2)
Other Current Assets | 0.4 | 0.2 | (2.4)
Other Current Liabilities | (32.3) | 5.9 | (42.3)
Net Cash Flows from Operating Activities | 723.1 | 601.2 | 611.7
Investing Activities |  |  |
Construction Expenditures | (1,053.0) | (1,048.6) | (841.6)
Change in Advances to Affiliates, Net | 0.9 | 1.0 | 0.6
Other Investing Activities | (2.8) | 42.4 | 14.5
Net Cash Flows Used for Investing Activities | (1,054.9) | (1,005.2) | (826.5)
Financing Activities |  |  |
Capital Contributions from Member | 6.5 | 0.0 | 0.0
Return of Capital to Parent Cash Flows | (0.7) | 0.0 | 0.0
Issuance of Long-term Debt | 200.0 | 698.0 | 494.0
Change in Advances from Affiliates, Net | 157.4 | (17.1) | 180.7
Retirement of Long-term Debt | (26.6) | (230.4) | (393.0)
Principal Payments for Finance Lease Obligations | (8.3) | (7.9) | (7.7)
Dividends Paid on Common Stock | 0.0 | (37.5) | (62.5)
Other Financing Activities | 1.5 | 0.7 | 0.7
Net Cash Flows from Financing Activities | 329.8 | 405.8 | 212.2
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | (2.0) | 1.8 | (2.6)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period | 21.9 | 20.1 | 22.7
Cash and Cash Equivalents at Beginning of Period | 7.5 |  |
Cash, Cash Equivalents and Restricted Cash at End of Period | 19.9 | 21.9 | 20.1
Cash and Cash Equivalents at End of Period | 5.0 | 7.5 |
Supplementary Information |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 259.7 | 215.1 | 207.5
Net Cash Paid (Received) for Income Taxes | 47.4 | (88.6) | 32.8
Noncash Acquisitions Under Finance Leases | 5.0 | 1.6 | 1.7
Construction Expenditures Included in Current Liabilities as of December 31, | 100.7 | 164.6 | 139.1
Indiana Michigan Power Co [Member] |  |  |
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
Rockport Plant, Unit 2 Operating Lease Amortization | 0.0 | 0.0 | 62.4
Deferred Income Taxes | (54.1) | (45.1) | (38.0)
Amortization (Deferral) of Incremental Nuclear Refueling Outage Expenses, Net | 25.6 | (49.2) | 7.5
Allowance for Equity Funds Used During Construction | (10.9) | (9.8) | (12.8)
Mark-to-Market of Risk Management Contracts | (22.2) | (16.9) | 5.2
Amortization of Nuclear Fuel | 96.6 | 82.9 | 85.3
Deferred Fuel Over/Under-Recovery, Net | 55.5 | (42.2) | (20.2)
Change in Other Noncurrent Assets | (80.3) | (47.3) | (54.1)
Change in Other Noncurrent Liabilities | 47.6 | 62.4 | 7.5
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | 71.4 | (82.7) | (22.3)
Fuel, Materials and Supplies | (61.4) | (2.6) | 30.1
Accounts Payable | 22.5 | 37.3 | 42.3
Accrued Taxes, Net | 1.5 | 9.4 | 1.6
Rockport Plant, Unit 2 Operating Lease Payments | 0.0 | 0.0 | (73.9)
Other Current Assets | (6.2) | 19.5 | (15.2)
Other Current Liabilities | (11.6) | (46.9) | 2.5
Net Cash Flows from Operating Activities | 879.9 | 720.7 | 733.7
Investing Activities |  |  |
Construction Expenditures | (550.3) | (557.8) | (500.9)
Change in Advances to Affiliates, Net | 23.0 | (1.5) | (8.2)
Purchases of Investment Securities | (2,845.1) | (2,765.4) | (1,928.2)
Sales of Investment Securities | 2,787.5 | 2,713.6 | 1,886.4
Acquisitions of Nuclear Fuel | (128.2) | (100.7) | (104.5)
Other Investing Activities | 6.1 | 10.3 | 22.3
Net Cash Flows Used for Investing Activities | (707.0) | (701.5) | (633.1)
Financing Activities |  |  |
Capital Contributions from Member | 8.8 | 7.9 | 0.0
Issuance of Long-term Debt | 565.3 | 142.7 | 546.7
Change in Advances from Affiliates, Net | (186.6) | 156.6 | (9.7)
Retirement of Long-term Debt | (343.3) | (83.4) | (383.5)
Principal Payments for Finance Lease Obligations | (7.4) | (130.7) | (6.8)
Dividends Paid on Common Stock | (212.5) | (110.0) | (250.0)
Other Financing Activities | 0.7 | 0.6 | 0.7
Net Cash Flows from Financing Activities | (175.0) | (16.3) | (102.6)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | (2.1) | 2.9 | (2.0)
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
Supplementary Information |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 131.6 | 120.9 | 110.9
Net Cash Paid (Received) for Income Taxes | 109.0 | 10.1 | 29.3
Noncash Acquisitions Under Finance Leases | 4.8 | 2.2 | 132.3
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
Ohio Power Co [Member] |  |  |
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)
Mark-to-Market of Risk Management Contracts | 11.0 | (52.8) | (17.8)
Property Taxes | (11.5) | (20.0) | (35.3)
Change in Regulatory Assets | (90.9) | 30.4 | 38.3
Change in Other Noncurrent Assets | (137.5) | (87.1) | (40.7)
Change in Other Noncurrent Liabilities | (0.4) | 91.1 | 6.9
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | 72.8 | (83.7) | (11.8)
Fuel, Materials and Supplies | (6.9) | (23.4) | (2.5)
Accounts Payable | 23.6 | 112.7 | 19.1
Accrued Taxes, Net | 27.5 | 27.8 | 78.2
Other Current Assets | 0.4 | 11.2 | (15.7)
Other Current Liabilities | (61.0) | 40.2 | (19.9)
Net Cash Flows from Operating Activities | 462.3 | 686.1 | 575.6
Investing Activities |  |  |
Construction Expenditures | (990.4) | (872.4) | (732.8)
Change in Advances to Affiliates, Net | 0.0 | 42.0 | (42.0)
Other Investing Activities | 41.0 | 27.9 | 21.5
Net Cash Flows Used for Investing Activities | (949.4) | (802.5) | (753.3)
Financing Activities |  |  |
Capital Contributions from Member | 175.0 | 1.0 | 0.0
Return of Capital to Parent Cash Flows | 0.0 | (2.0) | 0.0
Issuance of Long-term Debt | 395.0 | 0.0 | 1,037.1
Change in Advances from Affiliates, Net | (62.4) | 172.9 | (259.2)
Retirement of Long-term Debt | (0.6) | (0.1) | (500.1)
Principal Payments for Finance Lease Obligations | (5.0) | (4.9) | (4.9)
Dividends Paid on Common Stock | (20.0) | (45.0) | (100.0)
Other Financing Activities | 1.9 | 1.1 | 0.4
Net Cash Flows from Financing Activities | 483.9 | 123.0 | 173.3
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | (3.2) | 6.6 | (4.4)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period | 9.6 | 3.0 | 7.4
Cash and Cash Equivalents at Beginning of Period | 9.6 |  |
Cash, Cash Equivalents and Restricted Cash at End of Period | 6.4 | 9.6 | 3.0
Cash and Cash Equivalents at End of Period | 6.4 | 9.6 |
Supplementary Information |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 124.1 | 113.4 | 119.5
Net Cash Paid (Received) for Income Taxes | 38.9 | (19.7) | (7.9)
Noncash Acquisitions Under Finance Leases | 4.1 | 3.0 | 2.5
Construction Expenditures Included in Current Liabilities as of December 31, | 97.7 | 109.7 | 97.1
Public Service Co Of Oklahoma [Member] |  |  |
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)
Mark-to-Market of Risk Management Contracts | 33.0 | (13.7) | 1.9
Deferred Fuel Over/Under-Recovery, Net | 313.2 | 442.4 | (843.8)
Change in Other Regulatory Assets | (108.3) | 4.7 | (3.5)
Change in Other Noncurrent Assets | (71.3) | (40.1) | (14.8)
Change in Other Noncurrent Liabilities | 8.2 | 29.9 | 4.4
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | (16.3) | (46.0) | (28.7)
Fuel, Materials and Supplies | (16.8) | (51.1) | 1.4
Accounts Payable | (58.2) | 57.5 | 34.2
Accrued Taxes, Net | (12.9) | 3.2 | (6.5)
Other Current Assets | 10.7 | (6.3) | (6.3)
Other Current Liabilities | 45.4 | 30.4 | (20.8)
Net Cash Flows from Operating Activities | 590.5 | 747.7 | (433.3)
Investing Activities |  |  |
Construction Expenditures | (562.3) | (447.0) | (332.1)
Other Investing Activities | 15.2 | 4.3 | 2.4
Net Cash Flows Used for Investing Activities | (692.8) | (992.0) | (626.7)
Financing Activities |  |  |
Capital Contributions from Member | 0.6 | 3.6 | 625.0
Return of Capital to Parent Cash Flows | (3.9) | 0.0 | 0.0
Issuance of Long-term Debt | 469.8 | 499.7 | 1,290.0
Change in Advances from Affiliates, Net | (309.8) | 291.9 | (83.1)
Retirement of Long-term Debt | (0.5) | (500.5) | (750.5)
Principal Payments for Finance Lease Obligations | (3.3) | (3.2) | (3.2)
Dividends Paid on Common Stock | (52.5) | (45.0) | (20.0)
Other Financing Activities | 0.4 | 0.5 | 0.5
Net Cash Flows from Financing Activities | 100.8 | 247.0 | 1,058.7
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | (1.5) | 2.7 | (1.3)
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
Supplementary Information |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 87.3 | 79.7 | 57.0
Net Cash Paid (Received) for Income Taxes | (10.6) | (12.5) | (102.9)
Cash Received from the Sale of Transferable Tax Credits | (34.6) | 0.0 | 0.0
Noncash Acquisitions Under Finance Leases | 2.1 | 2.8 | 3.6
Construction Expenditures Included in Current Liabilities as of December 31, | 72.9 | 69.8 | 56.8
Public Service Co Of Oklahoma [Member] | Renewable Energy Facilities |  |  |
Investing Activities |  |  |
Acquisitions of Renewable Energy Facilities | (145.7) | (549.3) | (297.0)
Southwestern Electric Power Co [Member] |  |  |
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
Asset Impairments and Other Related Charges | 85.6 | 0.0 | 11.6
Allowance for Equity Funds Used During Construction | (11.5) | (4.9) | (7.0)
Mark-to-Market of Risk Management Contracts | 19.1 | (6.2) | (7.3)
Deferred Fuel Over/Under-Recovery, Net | 184.3 | (86.4) | (546.4)
Change in Regulatory Assets | (60.8) | 7.6 | (95.6)
Change in Other Noncurrent Assets | (40.5) | 42.9 | 41.9
Change in Other Noncurrent Liabilities | 11.0 | 18.3 | (1.1)
Changes in Certain Components of Working Capital: |  |  |
Accounts Receivable, Net | 20.1 | (28.2) | (21.5)
Fuel, Materials and Supplies | (31.4) | (9.3) | 126.5
Accounts Payable | (8.4) | 34.1 | 22.0
Accrued Taxes, Net | (4.5) | 9.8 | 15.4
Other Current Assets | 20.2 | (9.8) | (3.6)
Other Current Liabilities | (0.8) | (9.8) | 8.2
Net Cash Flows from Operating Activities | 803.0 | 586.6 | 96.8
Investing Activities |  |  |
Construction Expenditures | (780.5) | (586.4) | (414.6)
Change in Advances to Affiliates, Net | (0.1) | 153.8 | (153.8)
Other Investing Activities | 3.9 | 5.5 | 3.5
Net Cash Flows Used for Investing Activities | (776.7) | (1,085.1) | (920.7)
Financing Activities |  |  |
Capital Contributions from Member | 50.0 | 350.0 | 280.0
Issuance of Long-term Debt | 346.8 | 0.0 | 1,137.6
Change in Short-term Debt with Original Maturities Less Than 90 Days, Net | 4.3 | 0.0 | (35.0)
Change in Advances from Affiliates, Net | (222.0) | 310.7 | (124.6)
Retirement of Long-term Debt | (94.1) | (6.2) | (381.2)
Principal Payments for Finance Lease Obligations | (19.1) | (10.8) | (10.9)
Dividends Paid on Common Stock | (175.0) | (105.0) | 0.0
Dividends Paid on Common Stock - Nonaffiliated | (4.0) | (3.4) | (4.8)
Other Financing Activities | 0.8 | 0.4 | 0.8
Net Cash Flows from Financing Activities | (112.3) | 535.7 | 861.9
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash | (86.0) | 37.2 | 38.0
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
Supplementary Information |  |  |
Cash Paid for Interest, Net of Capitalized Amounts | 128.9 | 131.2 | 116.5
Net Cash Paid (Received) for Income Taxes | (41.0) | (29.1) | (28.8)
Cash Received from the Sale of Transferable Tax Credits | (41.4) | 0.0 | 0.0
Noncash Acquisitions Under Finance Leases | 7.1 | 3.6 | 4.8
Construction Expenditures Included in Current Liabilities as of December 31, | 63.7 | 105.6 | 69.0
Southwestern Electric Power Co [Member] | North Central Wind Energy Facilities |  |  |
Investing Activities |  |  |
Acquisitions of Renewable Energy Facilities | $ 0.0 | $ (658.0) | $ (355.8)

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