Report of Business Segments

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Report of Business Segments

Report of Business SegmentsOGE Energy reports its operations in two business segments: (i) the electric utility segment, which is engaged in the generation, transmission, distribution and sale of electric energy and (ii) the natural gas midstream operations segment. Other operations primarily includes the operations of the holding company. Intersegment revenues are recorded at prices comparable to those of unaffiliated customers and are affected by regulatory considerations. The following tables present the results of OGE Energy's business segments for the three months ended March 31, 2021 and 2020.

Three Months Ended March 31, 2021	Electric Utility		Natural Gas Midstream Operations		Other Operations		Eliminations		Total
(In millions)
Operating revenues	$	1,630.6	$	—	$	—	$	—	$	1,630.6
Cost of sales	1,346.8		—		—		—		1,346.8
Other operation and maintenance	110.3		0.4		(1.4)		—		109.3
Depreciation and amortization	98.7		—		—		—		98.7
Taxes other than income	25.7		0.1		1.4		—		27.2
Operating income (loss)	49.1		(0.5)		—		—		48.6
Equity in earnings of unconsolidated affiliates	—		53.2		—		—		53.2
Other income (expense)	1.7		(0.5)		(0.1)		(0.2)		0.9
Interest expense	38.4		—		1.2		(0.2)		39.4
Income tax expense (benefit)	1.2		14.3		(4.9)		—		10.6
Net income	$	11.2	$	37.9	$	3.6	$	—	$	52.7
Investment in unconsolidated affiliates	$	—	$	409.2	$	23.6	$	—	$	432.8
Total assets	$	11,248.2	$	415.4	$	521.6	$	(396.5)	$	11,788.7

Three Months Ended March 31, 2020	Electric Utility		Natural Gas Midstream Operations		Other Operations		Eliminations		Total
(In millions)
Operating revenues	$	431.3	$	—	$	—	$	—	$	431.3
Cost of sales	135.0		—		—		—		135.0
Other operation and maintenance	121.0		0.6		(1.6)		—		120.0
Depreciation and amortization	94.4		—		—		—		94.4
Taxes other than income	23.9		0.1		1.6		—		25.6
Operating income (loss)	57.0		(0.7)		—		—		56.3
Equity in losses of unconsolidated affiliates (A)	—		(746.5)		—		—		(746.5)
Other income	1.8		—		1.3		(1.0)		2.1
Interest expense	36.9		—		2.4		(1.0)		38.3
Income tax expense (benefit)	2.0		(179.2)		(57.4)		—		(234.6)
Net income (loss)	$	19.9	$	(568.0)	$	56.3	$	—	$	(491.8)
Investment in unconsolidated affiliates	$	—	$	348.0	$	19.5	$	—	$	367.5
Total assets	$	10,030.7	$	353.4	$	252.9	$	(266.1)	$	10,370.9

(A) In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4.