Report of Business Segments

6 Months Ended

Jun. 30, 2014

Segment Reporting [Abstract]

Report of Business Segments

Report of Business Segments

The Company 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) natural gas midstream operations segment.

As discussed in Note 3, in connection with the formation of Enable, effective May 1, 2013, OGE Energy deconsolidated its interest in Enogex Holdings and began accounting for its interest in Enable using the equity method of accounting. Accordingly, for periods through April 30, 2013, amounts reported for the natural gas midstream operations segment reflect the operating results of Enogex Holdings. Equity in earnings of unconsolidated affiliates in the natural gas midstream operations segment reflects OGE Energy's equity interest in Enable since May 1, 2013. Investment in unconsolidated affiliates in the natural gas midstream operations segment represents OGE Energy's investment in Enable.

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.

In reviewing its segment operating results, the Company focuses on operating income and equity in earnings of unconsolidated affiliates as measures of segment profit and loss, and, therefore, has presented this information below.  The following tables summarize the results of the Company's business segments during the three and sixmonths endedJune 30, 2014 and 2013.

Three Months Ended June 30, 2014	Electric Utility		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	611.8	$	—		$	—		$	—		$	611.8
Cost of sales	270.9		—			—			—			270.9
Other operation and maintenance	115.0		0.4			(4.0		)	—			111.4
Depreciation and amortization	65.0		—			3.3			—			68.3
Taxes other than income	18.7		—			0.7			—			19.4
Operating income (loss)	$	142.2	$	(0.4	)	$	—		$	—		$	141.8
Equity in earnings of unconsolidated affiliates	$	—	$	39.3		$	—		$	—		$	39.3
Investment in unconsolidated affiliates (at historical cost)	$	—	$	1,309.6		$	—		$	—		$	1,309.6
Total assets	$	7,908.0	$	1,371.8		$	141.0		$	(96.5	)	$	9,324.3

Three Months Ended June 30, 2013	Electric Utility		Natural Gas Midstream Operations		Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	574.6	$	166.1	$	—		$	(6.5	)	$	734.2
Cost of sales	247.6		129.7		—			(6.7		)	370.6
Other operation and maintenance	107.0		15.7		(0.7		)	—			122.0
Depreciation and amortization	62.0		9.2		3.2			—			74.4
Taxes other than income	19.9		2.5		0.9			—			23.3
Operating income (loss)	$	138.1	$	9.0	$	(3.4	)	$	0.2		$	143.9
Equity in earnings of unconsolidated affiliates	$	—	$	18.5	$	—		$	—		$	18.5
Investment in unconsolidated affiliates (at historical cost)	$	—	$	1,267.2	$	—		$	—		$	1,267.2
Total assets	$	7,453.6	$	1,266.8	$	189.4		$	(61.3	)	$	8,848.5

Six Months Ended June 30, 2014	Electric Utility		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	1,172.2	$	—		$	—		$	—		$	1,172.2
Cost of sales	564.3		—			—			—			564.3
Other operation and maintenance	232.1		0.4			(8.7		)	—			223.8
Depreciation and amortization	129.3		—			6.2			—			135.5
Taxes other than income	42.5		—			2.5			—			45.0
Operating income (loss)	$	204.0	$	(0.4	)	$	—		$	—		$	203.6
Equity in earnings of unconsolidated affiliates	$	—	$	87.2		$	—		$	—		$	87.2
Investment in unconsolidated affiliates (at historical cost)	$	—	$	1,309.6		$	—		$	—		$	1,309.6
Total assets	$	7,908.0	$	1,371.8		$	141.0		$	(96.5	)	$	9,324.3

Six Months Ended June 30, 2013	Electric Utility		Natural Gas Midstream Operations		Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	1,030.1	$	630.4	$	—		$	(24.9	)	$	1,635.6
Cost of sales	460.6		489.0		—			(26.0		)	923.6
Other operation and maintenance	212.1		60.9		(3.0		)	—			270.0
Depreciation and amortization	123.3		36.8		6.2			—			166.3
Taxes other than income	43.1		10.5		2.8			—			56.4
Operating income (loss)	$	191.0	$	33.2	$	(6.0	)	$	1.1		$	219.3
Equity in earnings of unconsolidated affiliates	$	—	$	18.5	$	—		$	—		$	18.5
Investment in unconsolidated affiliates (at historical cost)	$	—	$	1,267.2	$	—		$	—		$	1,267.2
Total assets	$	7,453.6	$	1,266.8	$	189.4		$	(61.3	)	$	8,848.5