MGE Energy Inc Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Comprehensive Income [Abstract]
Net Income	$ 16,150	$ 13,479	$ 33,178	$ 31,757
Other comprehensive income, net of tax:
Unrealized gain (loss) on available-for-sale securities, net of tax	10	(11)	(154)	(95)
Comprehensive Income	$ 16,160	$ 13,468	$ 33,024	$ 31,662