CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
OPERATING REVENUES
Electric Utility operating revenues	$ 723.2	$ 721.0	$ 1,753.3	$ 1,675.7
Natural Gas Midstream Operations operating revenues (Note 1)	0	392.4	605.5	1,133.4
Total operating revenues	723.2	1,113.4	2,358.8	2,809.1
COST OF GOODS SOLD (exclusive of depreciation and amortization shown below)
Electric Utility cost of goods sold	273.0	259.8	715.2	636.1
Natural Gas Midstream Operations cost of goods sold (Note 1)	0	279.8	481.4	798.1
Total cost of goods sold	273.0	539.6	1,196.6	1,434.2
Gross margin on revenues	450.2	573.8	1,162.2	1,374.9
OPERATING EXPENSES
Other operation and maintenance	102.2	147.1	372.2	447.7
Depreciation and amortization	65.4	93.0	231.7	270.1
Impairment of assets	0	0	0	0.3
Gain on insurance proceeds	0	0	0	(7.5)
Taxes other than income	21.7	29.7	78.1	84.7
Total operating expenses	189.3	269.8	682.0	795.3
OPERATING INCOME	260.9	304.0	480.2	579.6
OTHER INCOME (EXPENSE)
Equity in earnings of unconsolidated affiliates (Note 1)	46.0	0	64.5	0
Allowance for equity funds used during construction	1.7	1.3	4.4	4.9
Other income	6.2	2.6	25.4	12.8
Other expense	(5.2)	(5.6)	(15.9)	(11.1)
Net other income (expense)	48.7	(1.7)	78.4	6.6
INTEREST EXPENSE
Interest on long-term debt	35.0	40.2	110.7	118.3
Allowance for borrowed funds used during construction	(0.9)	(0.8)	(2.3)	(2.8)
Interest on short-term debt and other interest charges	(0.4)	2.2	3.8	6.6
Interest expense	33.7	41.6	112.2	122.1
INCOME BEFORE TAXES	275.9	260.7	446.4	464.1
INCOME TAX EXPENSE	60.7	68.3	110.2	122.6
NET INCOME	215.2	192.4	336.2	341.5
Less: Net income attributable to noncontrolling interests	0	6.9	6.2	25.0
NET INCOME ATTRIBUTABLE TO OGE ENERGY	$ 215.2	$ 185.5	$ 330.0	$ 316.5
BASIC AVERAGE COMMON SHARES OUTSTANDING	198.4	197.4	198.1	197.0
DILUTED AVERAGE COMMON SHARES OUTSTANDING	199.7	198.3	199.3	197.9
BASIC EARNINGS PER AVERAGE COMMON SHARE ATTRIBUTABLE TO OGE ENERGY COMMON SHAREHOLDERS	$ 1.08	$ 0.94	$ 1.67	$ 1.61
DILUTED EARNINGS PER AVERAGE COMMON SHARES ATTRIBUTABLE TO OGE ENERGY COMMON SHAREHOLDERS	$ 1.08	$ 0.94	$ 1.66	$ 1.60
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.20875	$ 0.19625	$ 0.62625	$ 0.58875