CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 170.2	$ 120.9
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation and amortization	278.0	264.7
Deferred income taxes and other tax credits, net	1.2	7.9
Allowance for equity funds used during construction	(13.0)	(11.3)
Stock-based compensation expense	6.6	6.5
Regulatory assets	(30.1)	(29.5)
Regulatory liabilities	0.4	(5.5)
Other assets	(5.2)	(5.3)
Other liabilities	9.7	42.8
Other	(8.7)	0.0
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	(116.9)	(47.5)
Income taxes receivable	(0.2)	11.6
Fuel, materials and supplies inventories	4.1	29.1
Fuel recoveries	11.8	9.3
Other current assets	23.9	(8.7)
Accounts payable	13.8	(48.4)
Other current liabilities	8.9	(0.5)
Net cash provided from operating activities	354.5	336.1
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(523.2)	(550.2)
Cost of removal and other	(35.8)	(39.4)
Net cash used in investing activities	(559.0)	(589.6)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	344.4	356.5
Payment of long-term debt	(32.5)	(0.1)
Increase (decrease) in short-term debt	65.2	(137.9)
Increase in long-term borrowings under revolver	0.0	200.0
Dividends paid on common stock	(171.5)	(169.9)
Proceeds (costs) from issuance of common stock	6.1	10.9
Cash paid for employee equity-based compensation	(7.3)	(6.1)
Net cash provided from financing activities	204.4	253.4
NET CHANGE IN CASH AND CASH EQUIVALENTS	(0.1)	(0.1)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0.6	0.2
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0.5	0.1
OG&E [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	178.7	134.5
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation and amortization	278.0	264.7
Deferred income taxes and other tax credits, net	2.0	8.8
Allowance for equity funds used during construction	(13.0)	(11.3)
Stock-based compensation expense	6.6	6.5
Regulatory assets	(30.1)	(29.5)
Regulatory liabilities	0.4	(5.5)
Other assets	(4.7)	(1.7)
Other liabilities	10.1	47.9
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	(116.9)	(46.7)
Fuel, materials and supplies inventories	4.1	29.1
Fuel recoveries	11.8	9.3
Other current assets	19.7	(12.9)
Accounts payable	42.9	(29.2)
Income taxes payable - parent	9.7	17.2
Other current liabilities	(3.5)	5.7
Net cash provided from operating activities	395.8	386.9
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(523.2)	(550.2)
Cost of removal	(34.9)	(37.4)
Net cash used in investing activities	(558.1)	(587.6)
CASH FLOWS FROM FINANCING ACTIVITIES
Changes in advances with parent	(169.6)	0.7
Proceeds from long-term debt	344.4	0.0
Payment of long-term debt	(32.5)	(0.1)
Increase in long-term borrowings under revolver	0.0	200.0
Capital contribution from OGE Energy	150.0	0.0
Dividends paid on common stock	(130.0)	0.0
Net cash provided from financing activities	162.3	200.6
NET CHANGE IN CASH AND CASH EQUIVALENTS	0.0	(0.1)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0.2	0.2
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 0.2	$ 0.1