CONDENSED STATEMENTS OF CHANGES IN STOCKHOLDER'S EQUITY (Unaudited) (USD $) In Millions, unless otherwise specified	Total	Common Stock	Premium on Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2010	$ 2,178.1	$ 100.9	$ 857.5	$ 1,221.8	$ (2.1)
Comprehensive income (loss)
Net income	243.6	0	0	243.6	0
Other comprehensive income (loss), net of tax	0.1	0	0	0	0.1
Comprehensive income (loss)	243.7	0	0	243.6	0.1
Dividends declared on common stock				0
Stock-based compensation	2.3	0	2.3	0	0
Capital contribution from OGE Energy	50.0	0	50.0	0	0
Balance at Sep. 30, 2011	2,474.1	100.9	909.8	1,465.4	(2.0)
Balance at Dec. 31, 2011	2,494.0	100.9	910.5	1,485.1	(2.5)
Comprehensive income (loss)
Net income	252.7	0	0	252.7	0
Other comprehensive income (loss), net of tax	1.0	0	0	0	1.0
Comprehensive income (loss)	253.7	0	0	252.7	1.0
Dividends declared on common stock	(75.0)	0	0	(75.0)	0
Stock-based compensation	1.8	0	1.8	0	0
Capital contribution from OGE Energy	0
Balance at Sep. 30, 2012	$ 2,674.5	$ 100.9	$ 912.3	$ 1,662.8	$ (1.5)