Madison Gas and Electric Company Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other comprehensive income, net of tax:
Unrealized gain (loss) on available-for-sale securities, net of tax	$ 60	$ 11	$ 189	$ (143)
Comprehensive Income	26,689	27,891	61,661	60,915
MGE [Member]
Net Income	25,353	27,662	57,686	60,949
Other comprehensive income, net of tax:
Unrealized gain (loss) on available-for-sale securities, net of tax	(7)	8	(38)	(31)
Total comprehensive income including noncontrolling interest	25,346	27,670	57,648	60,918
Less: Comprehensive income attributable to Noncontrolling Interest, net of tax	(5,439)	(5,695)	(16,224)	(17,899)
Comprehensive Income	$ 19,907	$ 21,975	$ 41,424	$ 43,019