CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
OPERATING REVENUES
Electric Utility operating revenues	$ 2,141.2		$ 2,211.5		$ 2,109.9
Natural Gas Midstream Operations operating revenues	1,530.0		1,704.4		1,607.0
Total operating revenues	3,671.2		3,915.9		3,716.9
COST OF GOODS SOLD (exclusive of depreciation and amortization shown below)
Electric Utility cost of goods sold	819.0		966.0		952.6
Natural Gas Midstream Operations cost of goods sold	1,099.7		1,311.9		1,234.8
Total cost of goods sold	1,918.7		2,277.9		2,187.4
Gross margin on revenues	1,752.5		1,638.0		1,529.5
OPERATING EXPENSES
Other operation and maintenance	601.5		581.2		549.8
Depreciation and amortization	371.0		307.1		291.3
Impairment of assets	0.4		6.3		1.1
Gain on insurance proceeds	(7.5)		(3.0)		0
Taxes other than income	110.2		99.7		93.4
Total operating expenses	1,075.6		991.3		935.6
OPERATING INCOME	676.9		646.7		593.9
OTHER INCOME (EXPENSE)
Interest income	0.6		0.5		0
Allowance for equity funds used during construction	6.2		20.4		11.4
Other income	17.0		19.3		13.7
Other expense	(16.5)		(21.7)		(17.9)
Net other income	7.3		18.5		7.2
INTEREST EXPENSE
Interest on long-term debt	158.9		146.1		139.3
Allowance for borrowed funds used during construction	(3.5)		(10.4)		(5.5)
Interest on short-term debt and other interest charges	8.7		5.2		5.9
Interest expense	164.1		140.9		139.7
INCOME BEFORE TAXES	520.1		524.3		461.4
INCOME TAX EXPENSE	135.1		160.7		161.0
NET INCOME	385.0		363.6		300.4
Less: Net income attributable to noncontrolling interests	30.0		20.7		5.1
NET INCOME ATTRIBUTABLE TO OGE ENERGY	$ 355.0		$ 342.9		$ 295.3
BASIC AVERAGE COMMON SHARES OUTSTANDING (in shares)	98.6		97.9		97.3
DILUTED AVERAGE COMMON SHARES OUTSTANDING (in shares)	99.1		99.2		98.9
BASIC EARNINGS PER AVERAGE COMMON SHARE ATTRIBUTABLE TO OGE ENERGY COMMON SHAREHOLDERS (in dollars per share)	$ 3.60	[1]	$ 3.50	[1]	$ 3.03
DILUTED EARNINGS PER AVERAGE COMMON SHARE ATTRIBUTABLE TO OGE ENERGY COMMON SHAREHOLDERS (in dollars per share)	$ 3.58	[1]	$ 3.45	[1]	$ 2.99
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 1.5950		$ 1.5175		$ 1.4625

[1] Due to the impact of dilution on the earnings per share calculation, quarterly earnings per share amounts may not add to the total.