Madison Gas and Electric Company Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other comprehensive income, net of tax:
Unrealized gain (loss) on available for sale securities, net of tax	$ 175	$ (155)	$ (101)
Comprehensive Income	97,781	75,405	71,242
MGE [Member]
Net Income	93,072	74,592	71,465
Other comprehensive income, net of tax:
Unrealized gain (loss) on available for sale securities, net of tax	(47)	(4)	(121)
Comprehensive Income Including Noncontrolling Interest	93,025	74,588	71,344
Less: Comprehensive Income Attributable to Noncontrolling Interest, net of tax	(43,237)	(23,358)	(26,097)
Comprehensive Income	$ 49,788	$ 51,230	$ 45,247