MGE Energy Inc Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Comprehensive Income [Abstract]
Net Income	$ 13,479	$ 14,087	$ 31,757	$ 41,804
Other comprehensive income (loss), net of tax:
Unrealized (loss) gain on available-for-sale securities, net of tax	(11)	(46)	(95)	(39)
Comprehensive Income	$ 13,468	$ 14,041	$ 31,662	$ 41,765