CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Revenues from contracts with customers	[1]	$ 1,621.0	$ 420.4
Other revenues		9.6	10.9
Operating revenues		1,630.6	431.3
COST OF SALES		1,346.8	135.0
OPERATING EXPENSES
Other operation and maintenance		109.3	120.0
Depreciation and amortization		98.7	94.4
Taxes other than income		27.2	25.6
Operating expenses		235.2	240.0
OPERATING INCOME		48.6	56.3
OTHER INCOME (EXPENSE)
Equity in earnings (losses) of unconsolidated affiliates		53.2	(746.5)	[2]
Allowance for equity funds used during construction		1.3	1.3
Other net periodic benefit expense		(1.4)	(0.5)
Other income		3.0	7.4
Other expense		(2.0)	(6.1)
Net other income (expense)		54.1	(744.4)
INTEREST EXPENSE
Interest on long-term debt		38.4	36.6
Allowance for borrowed funds used during construction		(0.8)	(0.5)
Interest on short-term debt and other interest charges		1.8	2.2
Interest expense		39.4	38.3
INCOME (LOSS) BEFORE TAXES		63.3	(726.4)
INCOME TAX EXPENSE (BENEFIT)		10.6	(234.6)
NET INCOME (LOSS)		$ 52.7	$ (491.8)
BASIC AVERAGE COMMON SHARES OUTSTANDING		200.1	200.2
DILUTED AVERAGE COMMON SHARES OUTSTANDING		200.1	200.2
BASIC EARNINGS (LOSS) PER AVERAGE COMMON SHARE		$ 0.26	$ (2.46)
DILUTED EARNINGS (LOSS) PER AVERAGE COMMON SHARE		$ 0.26	$ (2.46)
Other Comprehensive Income (Loss), Net of Tax		$ 3.5	$ (0.9)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		56.2	(492.7)
OG&E [Member]
Revenues from contracts with customers		1,621.0	420.4
Other revenues		9.6	10.9
Operating revenues		1,630.6	431.3
COST OF SALES		1,346.8	135.0
OPERATING EXPENSES
Other operation and maintenance		110.3	121.0
Depreciation and amortization		98.7	94.4
Taxes other than income		25.7	23.9
Operating expenses		234.7	239.3
OPERATING INCOME		49.1	57.0
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction		1.3	1.3
Other net periodic benefit expense		(0.9)	(0.5)
Other income		1.7	1.5
Other expense		(0.4)	(0.5)
Net other income (expense)		1.7	1.8
INTEREST EXPENSE
Interest on long-term debt		38.4	36.6
Allowance for borrowed funds used during construction		(0.8)	(0.5)
Interest on short-term debt and other interest charges		0.8	0.8
Interest expense		38.4	36.9
INCOME (LOSS) BEFORE TAXES		12.4	21.9
INCOME TAX EXPENSE (BENEFIT)		1.2	2.0
NET INCOME (LOSS)		11.2	19.9
Other Comprehensive Income (Loss), Net of Tax		0.0	0.0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		$ 11.2	$ 19.9

[1] In February 2021, OG&E's service territory experienced an unprecedented, prolonged, cold spell that resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices. Operating revenues significantly increased due to increased cost of sales, which are recovered from customers, as a result of the February 2021 extreme cold weather event. For further discussion, see Note 15 and "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operation."

[2] In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4