Madison Gas and Electric Company Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other comprehensive income, net of tax:
Unrealized gain (loss) on available for sale securities, net of tax	$ 0	$ 175	$ (155)
Comprehensive Income	84,219	97,781	75,405
MGE [Member]
Net Income	79,036	93,072	74,592
Other comprehensive income, net of tax:
Unrealized gain (loss) on available for sale securities, net of tax	0	(47)	(4)
Comprehensive Income Including Noncontrolling Interest	79,036	93,025	74,588
Less: Comprehensive Income Attributable to Noncontrolling Interest, net of tax	(22,552)	(43,237)	(23,358)
Comprehensive Income	$ 56,484	$ 49,788	$ 51,230