CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING REVENUES
Electric Utility operating revenues	$ 455.5	$ 426.7
Natural Gas Midstream Operations operating revenues	445.9	414.0
Total operating revenues	901.4	840.7
COST OF GOODS SOLD (exclusive of depreciation and amortization shown below)
Electric Utility cost of goods sold	199.4	183.6
Natural Gas Midstream Operations cost of goods sold	353.6	301.7
Total cost of goods sold	553.0	485.3
Gross margin on revenues	348.4	355.4
OPERATING EXPENSES
Other operation and maintenance	148.0	147.6
Depreciation and amortization	91.9	86.6
Impairment of assets	0	0.2
Gain on insurance proceeds	0	(7.5)
Taxes other than income	33.1	30.2
Total operating expenses	273.0	257.1
OPERATING INCOME	75.4	98.3
OTHER INCOME (EXPENSE)
Interest income	0.1	0
Allowance for equity funds used during construction	1.2	1.9
Other income	14.6	7.7
Other expense	(6.5)	(1.9)
Net other income	9.4	7.7
INTEREST EXPENSE
Interest on long-term debt	39.7	39.2
Allowance for borrowed funds used during construction	(0.7)	(1.1)
Interest on short-term debt and other interest charges	2.2	2.0
Interest expense	41.2	40.1
INCOME BEFORE TAXES	43.6	65.9
INCOME TAX EXPENSE	15.6	18.4
NET INCOME	28.0	47.5
Less: Net income attributable to noncontrolling interests	4.9	10.4
NET INCOME ATTRIBUTABLE TO OGE ENERGY	$ 23.1	$ 37.1
BASIC AVERAGE COMMON SHARES OUTSTANDING (in shares)	98.9	98.3
DILUTED AVERAGE COMMON SHARES OUTSTANDING (in shares)	99.4	98.8
BASIC EARNINGS PER AVERAGE COMMON SHARE ATTRIBUTABLE TO OGE ENERGY COMMON SHAREHOLDERS (in dollars per share)	$ 0.23	$ 0.38
DILUTED EARNINGS PER AVERAGE COMMON SHARE ATTRIBUTABLE TO OGE ENERGY COMMON SHAREHOLDERS (in dollars per share)	$ 0.23	$ 0.38
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.4175	$ 0.3925