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	85.0	0	0	85.0	0
Other comprehensive income (loss), net of tax	0.2	0	0	0	0.2
Comprehensive income (loss)	85.2	0	0	85.0	0.2
Stock-based compensation	1.7	0	1.7	0	0
Capital contribution from OGE Energy	50.0	0	50.0	0	0
Balance at Jun. 30, 2011	2,315.0	100.9	909.2	1,306.8	(1.9)
Balance at Dec. 31, 2011	2,494.0	100.9	910.5	1,485.1	(2.5)
Comprehensive income (loss)
Net income	85.5	0	0	85.5	0
Other comprehensive income (loss), net of tax	0.5	0	0	0	0.5
Comprehensive income (loss)	86.0	0	0	85.5	0.5
Stock-based compensation	1.2	0	1.2	0	0
Capital contribution from OGE Energy	0
Balance at Jun. 30, 2012	$ 2,581.2	$ 100.9	$ 911.7	$ 1,570.6	$ (2.0)