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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 441.5 $ 416.8 $ 665.7
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 539.5 506.6 460.9
Deferred income taxes and other tax credits, net 15.6 11.6 (154.0)
Gain on investment in equity securities (Note 1) 0.0 0.0 (282.1)
Allowance for equity funds used during construction (25.5) (19.4) (6.9)
Stock-based compensation expense 11.7 13.1 9.7
Regulatory assets (52.4) (92.1) 702.2
Regulatory liabilities (2.8) (12.2) (9.1)
Other assets (16.8) 0.0 18.9
Other liabilities 30.6 5.0 (6.6)
Change in certain current assets and liabilities:      
Accounts receivable and accrued unbilled revenues, net (33.6) 42.8 (97.0)
Income taxes receivable 18.2 2.5 (18.1)
Fuel, materials and supplies inventories 25.7 (122.8) (130.1)
Fuel recoveries (123.9) 535.4 (363.0)
Other current assets (30.1) 44.6 (30.2)
Accounts payable (14.7) (136.3) 155.4
Other current liabilities 29.8 36.7 36.7
Net cash provided from operating activities 812.8 1,232.3 952.4
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (less allowance for equity funds used during construction) (1,090.9) (1,178.2) (1,050.9)
Proceeds from Sale of Equity Securities, FV-NI 0.0 0.0 1,067.2
Cost of removal and other (70.3) (93.9) (112.7)
Net cash used in investing activities (1,161.2) (1,272.1) (96.4)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from long-term debt 706.3 788.3 49.3
Payment of long-term debt (0.1) (1,000.1) (0.1)
(Decrease) increase in short-term debt (29.9) 499.2 (486.9)
Dividends paid on common stock (338.5) (333.2) (329.3)
Cash paid for employee equity-based compensation (6.1) (2.3) (0.9)
Proceeds (costs) from issuance of common stock 17.1 0.0 0.0
Net cash provided from (used in) financing activities 348.8 (48.1) (767.9)
NET CHANGE IN CASH AND CASH EQUIVALENTS 0.4 (87.9) 88.1
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 0.2 88.1 0.0
CASH AND CASH EQUIVALENTS AT END OF YEAR 0.6 0.2 88.1
SUPPLEMENTAL CASH FLOW INFORMATION      
Interest (net of interest capitalized) 251.1 202.4 164.0
Income taxes (net of income tax refunds) 36.9 41.5 276.0
NON-CASH INVESTING AND FINANCING ACTIVITIES      
Power plant long-term service agreement 6.4 0.7 0.8
Tinker Air Force Base distribution assets purchase 2.6 0.0 0.0
OG&E [Member]      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income 469.9 426.4 439.5
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 539.5 506.6 460.9
Deferred income taxes and other tax credits, net 16.8 15.4 220.5
Allowance for equity funds used during construction (25.5) (19.4) (6.9)
Stock-based compensation expense 11.7 3.1 2.9
Regulatory assets (52.4) (92.1) 702.2
Regulatory liabilities (2.8) (12.2) (9.1)
Other assets (9.8) 4.7 0.0
Other liabilities 28.0 0.3 (5.6)
Change in certain current assets and liabilities:      
Accounts receivable and accrued unbilled revenues, net (33.2) 42.1 (96.6)
Fuel, materials and supplies inventories 25.7 (122.8) (130.1)
Fuel recoveries (123.9) 535.4 (363.0)
Other current assets (36.5) 51.1 (30.1)
Accounts payable (0.3) (131.1) 135.8
Income taxes payable - parent 23.8 9.4 8.0
Other current liabilities 30.8 34.6 19.3
Net cash provided from operating activities 861.8 1,251.5 1,347.7
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (less allowance for equity funds used during construction) (1,090.9) (1,178.2) (1,050.9)
Cost of removal (67.5) (91.0) (109.3)
Net cash used in investing activities (1,158.4) (1,269.2) (1,160.2)
CASH FLOWS FROM FINANCING ACTIVITIES      
Changes In advances with parent (53.8) 229.2 (187.4)
Proceeds from long-term debt 350.5 788.8 0.0
Payment of long-term debt (0.1) (500.1) (0.1)
Dividends paid on common stock 0.0 (500.0) 0.0
Net cash provided from (used in) financing activities 296.6 17.9 (187.5)
NET CHANGE IN CASH AND CASH EQUIVALENTS 0.0 0.2 0.0
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 0.2 0.0 0.0
CASH AND CASH EQUIVALENTS AT END OF YEAR 0.2 0.2 0.0
SUPPLEMENTAL CASH FLOW INFORMATION      
Interest (net of interest capitalized) 206.3 180.7 154.6
Income taxes (net of income tax refunds) 52.0 44.2 (152.6)
NON-CASH INVESTING AND FINANCING ACTIVITIES      
Power plant long-term service agreement 6.4 0.7 0.8
Tinker Air Force Base distribution assets purchase $ 2.6 $ 0.0 $ 0.0