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Report of Business Segments
 12 Months Ended
Dec. 31, 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.

The following tables summarize the results of the Company's business segments for the years ended December 31, 2014, 2013 and 2012.
2014
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
2,453.1

$
—

$
—

$
—

$
2,453.1

Cost of sales
1,106.6

—

—

—

1,106.6

Other operation and maintenance
453.2

1.2

(14.8
)
—

439.6

Depreciation and amortization
270.8

—

10.6

—

281.4

Taxes other than income
84.5

—

4.2

—

88.7

Operating income (loss)
538.0

(1.2
)
—

—

536.8

Equity in earnings of unconsolidated affiliates
—

172.6

—

—

172.6

Other income (expense)
7.1

—

0.7

(0.2
)
7.6

Interest expense
141.5

—

7.1

(0.2
)
148.4

Income tax expense
111.6

69.1

(7.9
)
—

172.8

Net income (loss)
$
292.0

$
102.3

$
1.5

$
—

$
395.8

Investment in unconsolidated affiliates (at historical cost)
$
—

$
1,318.2

$
—

$
—

$
1,318.2

Total assets
$
8,266.2

$
1,461.2

$
129.2

$
(328.8
)
$
9,527.8

Capital expenditures
$
565.4

$
—

$
10.8

$
(6.9
)
$
569.3

2013
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
2,262.2

$
630.4

$
—

$
(24.9
)
$
2,867.7

Cost of sales
965.9

489.0

—

(26.0
)
1,428.9

Other operation and maintenance
438.8

60.9

(10.5
)
—

489.2

Depreciation and amortization
248.4

36.8

12.1

—

297.3

Taxes other than income
83.8

10.5

4.5

—

98.8

Operating income (loss)
525.3

33.2

(6.1
)
1.1

553.5

Equity in earnings of unconsolidated affiliates
—

101.9

—

—

101.9

Other income (expense)
10.1

8.9

(2.3
)
(0.5
)
16.2

Interest expense
129.3

10.6

8.1

(0.5
)
147.5

Income tax expense
113.5

26.9

(10.6
)
0.5

130.3

Net income (loss)
292.6

106.5

(5.9
)
0.6

393.8

Less: Net income attributable to noncontrolling interests
—

6.6

—

(0.4
)
6.2

Net income attributable to OGE Energy
$
292.6

$
99.9

$
(5.9
)
$
1.0

$
387.6

Investment in unconsolidated affiliates (at historical cost)
$
—

$
1,298.8

$
—

$
—

$
1,298.8

Total assets
$
7,694.9

$
1,348.6

$
216.2

$
(125.0
)
$
9,134.7

Capital expenditures
$
797.6

$
181.5

$
11.5

$
—

$
990.6



2012
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
2,141.2

$
1,608.6

$
—

$
(78.6
)
$
3,671.2

Cost of sales
879.1

1,120.1

—

(80.5
)
1,918.7

Other operation and maintenance
446.3

172.9

(17.7
)
—

601.5

Depreciation and amortization
248.7

109.2

13.5

—

371.4

Gain on insurance proceeds
—

(7.5
)
—

—

(7.5
)
Taxes other than income
77.7

28.3

4.2

—

110.2

Operating income (loss)
489.4

185.6

—

1.9

676.9

Other income (expense)
10.1

(3.5
)
1.8

(1.1
)
7.3

Interest expense
124.6

32.6

8.0

(1.1
)
164.1

Income tax expense
94.6

45.7

(5.8
)
0.6

135.1

Net income (loss)
280.3

103.8

(0.4
)
1.3

385.0

Less: Net income attributable to noncontrolling interests
—

29.7

—

0.3

30.0

Net income attributable to OGE Energy
$
280.3

$
74.1

$
(0.4
)
$
1.0

$
355.0

Total assets
$
7,222.4

$
2,681.3

$
242.6

$
(224.1
)
$
9,922.2

Capital expenditures
$
704.4

$
506.5

$
18.3

$
—

$
1,229.2