Madison Gas and Electric Company Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities, net of tax	$ 65	[1]	$ 7	[2]
Comprehensive Income	22,649		16,055
MGE [Member]
Net Income	22,560		16,214
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities, net of tax	27	[3]	(16)	[4]
Total comprehensive income including noncontrolling interest	22,587		16,198
Less: Comprehensive income attributable to Noncontrolling Interest, net of tax	(6,826)		(6,072)
Comprehensive Income	$ 15,761		$ 10,126

[1] Net of $43 tax

[2] Net of $5 tax

[3] Net of $18 tax

[4] Net of $11 tax