CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
CURRENT ASSETS
Cash and cash equivalents	$ 0.2	$ 88.1
Accounts receivable	208.8	250.1
Accrued unbilled revenues	72.7	74.2
Income taxes receivable	18.2	20.7
Fuel inventories	158.5	108.8
Materials and supplies, at average cost	254.3	180.5
Fuel clause under recoveries	0.0	514.9
Other	58.8	103.5
Total current assets	771.5	1,340.8
OTHER PROPERTY AND INVESTMENTS
Other	114.0	105.8
Total other property and investments	114.0	105.8
PROPERTY, PLANT AND EQUIPMENT
In service	15,588.2	14,695.2
Construction work in progress	522.2	436.1
Total property, plant and equipment	16,110.4	15,131.3
Less: accumulated depreciation	4,809.4	4,584.5
Net property, plant and equipment	11,301.0	10,546.8
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	577.6	524.3
Other	26.6	27.0
Total deferred charges and other assets	604.2	551.3
TOTAL ASSETS	12,790.7	12,544.7
CURRENT LIABILITIES
Short-term debt	499.2	0.0
Accounts payable	276.4	448.9
Dividends payable	83.8	82.9
Customer deposits	103.5	88.8
Accrued taxes	47.6	54.0
Accrued interest	57.4	41.1
Accrued compensation	46.8	37.0
Long-term debt due within one year	0.0	999.9
Fuel clause over recoveries	20.5	0.0
Other	44.0	49.6
Total current liabilities	1,179.2	1,802.2
LONG-TERM DEBT	4,340.5	3,548.7
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	172.7	176.9
Deferred income taxes	1,300.8	1,233.5
Deferred investment tax credits	11.3	12.0
Regulatory liabilities	1,061.6	1,147.1
Other	213.0	210.9
Total deferred credits and other liabilities	2,759.4	2,780.4
Total liabilities	8,279.1	8,131.3
COMMITMENTS AND CONTINGENCIES (NOTE 13)
STOCKHOLDERS' EQUITY
Common stockholders' equity	1,145.1	1,134.5
Retained earnings	3,373.7	3,290.9
Accumulated other comprehensive loss, net of tax	(7.2)	(11.9)
Treasury stock, at cost	0.0	(0.1)
Total stockholders' equity	4,511.6	4,413.4
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	12,790.7	12,544.7
OG&E [Member]
CURRENT ASSETS
Cash and cash equivalents	0.2	0.0
Accounts receivable	208.8	249.4
Accrued unbilled revenues	72.7	74.2
Advances to parent	0.0	91.0
Fuel inventories	158.5	108.8
Materials and supplies, at average cost	254.3	180.5
Fuel clause under recoveries	0.0	514.9
Other	46.7	97.8
Total current assets	741.2	1,316.6
OTHER PROPERTY AND INVESTMENTS
Total other property and investments	4.6	4.4
PROPERTY, PLANT AND EQUIPMENT
In service	15,582.1	14,689.1
Construction work in progress	522.2	436.1
Total property, plant and equipment	16,104.3	15,125.2
Less: accumulated depreciation	4,809.4	4,584.5
Net property, plant and equipment	11,294.9	10,540.7
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	577.6	524.3
Other	24.3	24.5
Total deferred charges and other assets	601.9	548.8
TOTAL ASSETS	12,642.6	12,410.5
CURRENT LIABILITIES
Accounts payable	228.5	395.8
Advances from parent	147.7	0.0
Customer deposits	103.5	88.8
Accrued taxes	47.2	46.5
Accrued interest	56.6	40.8
Accrued compensation	37.0	27.8
Long-term debt due within one year	0.0	500.0
Fuel clause over recoveries	20.5	0.0
Other	43.6	49.3
Total current liabilities	684.6	1,149.0
LONG-TERM DEBT	4,290.6	3,498.9
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	96.2	98.3
Deferred income taxes	1,340.8	1,271.1
Deferred investment tax credits	11.3	12.0
Regulatory liabilities	1,061.6	1,147.1
Other	182.8	188.9
Total deferred credits and other liabilities	2,692.7	2,717.4
Total liabilities	7,667.9	7,365.3
COMMITMENTS AND CONTINGENCIES (NOTE 13)
STOCKHOLDERS' EQUITY
Common stockholders' equity	1,577.7	1,574.6
Retained earnings	3,397.0	3,470.6
Total stockholders' equity	4,974.7	5,045.2
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 12,642.6	$ 12,410.5