Madison Gas and Electric Company Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities, net of tax	$ 75	[1]	$ 36	[2]	$ 140	[3]	$ 43	[4]
Comprehensive Income	13,966		14,306		36,615		30,361
MGE [Member]
Net Income	13,965		14,290		36,525		30,504
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities, net of tax	1	[5]	(7)	[6]	28	[7]	(23)	[8]
Total comprehensive income including noncontrolling interest	13,966		14,283		36,553		30,481
Less: Comprehensive income attributable to Noncontrolling Interest, net of tax	(6,860)		(6,080)		(13,686)		(12,152)
Comprehensive Income	$ 7,106		$ 8,203		$ 22,867		$ 18,329

[1] Net of $50 tax

[2] Net of $24 tax

[3] Net of $93 tax

[4] Net of $29 tax

[5] Net of $1 tax

[6] Net of $5 tax

[7] Net of $19 tax

[8] Net of $15 tax