Madison Gas and Electric Company Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities, net of tax	$ (8)	[1]	$ (74)	[2]	$ 35	[3]	$ 7	[4]
Reclassification of realized gain on available-for-sale securities, net of tax	0	[5]	0	[5]	0	[5]	(15)	[6]
Comprehensive Income	23,634		20,964		53,995		51,536
MGE [Member]
Net Income	23,676		21,092		54,180		51,770
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities, net of tax	(7)	[1]	(52)	[7]	(30)	[8]	(20)	[9]
Reclassification of realized gain on available-for-sale securities, net of tax	0	[5]	0	[5]	0	[5]	(15)	[6]
Total comprehensive income including noncontrolling interest	23,669		21,040		54,150		51,735
Less: Comprehensive income attributable to Noncontrolling Interest, net of tax	(6,153)		(6,010)		(18,305)		(17,935)
Comprehensive Income	$ 17,516		$ 15,030		$ 35,845		$ 33,800

[1] Net of $5 tax

[2] Net of $50 tax

[3] Net of $24 tax

[4] Net of $4 tax

[5] Net of $0 tax

[6] Net of $10 tax

[7] Net of $35 tax

[8] Net of $20 tax

[9] Net of $14 tax