MGE Energy Inc Consolidated Statements of Common Equity (Unaudited) (USD $) In Thousands, except Share data		Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss)/ Income [Member]
Beginning balance, value at Dec. 31, 2010		$ 525,080	$ 23,114	$ 316,268	$ 185,556	$ 142
Beginning balance, shares at Dec. 31, 2010			23,114,000
Net Income		17,783			17,783
Other comprehensive income (loss)		72				72
Common stock dividends declared	[1]	(8,670)			(8,670)
Common stock issued during period		0
Ending balance, value at Mar. 31, 2011		534,265	23,114	316,268	194,669	214
Ending balance, shares at Mar. 31, 2011			23,114,000
Beginning balance, value at Dec. 31, 2011		550,952	23,114	316,268	211,458	112
Beginning balance, shares at Dec. 31, 2011			23,114,000
Net Income		16,048			16,048
Other comprehensive income (loss)		7				7
Common stock dividends declared	[2]	(8,843)			(8,843)
Common stock issued during period		0
Ending balance, value at Mar. 31, 2012		$ 558,164	$ 23,114	$ 316,268	$ 218,663	$ 119
Ending balance, shares at Mar. 31, 2012			23,114,000

[1] $0.375 per share

[2] $0.383 per share