MGE Energy Inc Consolidated Statements of Income (Unaudited) (MGE Energy [Member], USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
MGE Energy [Member]
Operating Revenues:
Regulated electric revenues	$ 114,963	$ 109,849	$ 291,804	$ 279,281
Regulated gas revenues	17,249	17,394	119,748	114,231
Nonregulated revenues	1,360	695	3,884	3,151
Total Operating Revenues	133,572	127,938	415,436	396,663
Operating Expenses:
Fuel for electric generation	16,656	12,622	39,304	31,765
Purchased power	18,024	18,603	49,997	56,537
Cost of gas sold	8,171	8,300	72,170	70,776
Other operations and maintenance	39,744	40,403	119,814	120,126
Depreciation and amortization	10,296	9,560	30,669	28,263
Other general taxes	4,347	4,098	13,053	12,947
Total Operating Expenses	97,238	93,586	325,007	320,414
Operating Income	36,334	34,352	90,429	76,249
Other income, net	2,341	2,646	6,880	9,314
Interest expense, net	(5,142)	(4,099)	(15,047)	(12,052)
Income before income taxes	33,533	32,899	82,262	73,511
Income tax provision	(12,495)	(12,990)	(30,718)	(27,790)
Net Income	$ 21,038	$ 19,909	$ 51,544	$ 45,721
Earnings Per Share of Common Stock (basic and diluted)	$ 0.91	$ 0.86	$ 2.23	$ 1.98
Dividends per share of common stock	$ 0.383	$ 0.375	$ 1.133	$ 1.112
Average Shares Outstanding (basic and diluted)	23,114	23,114	23,114	23,114