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		30,506			30,506
Other comprehensive income (loss)		66				66
Common stock dividends declared	[1]	(17,340)			(17,340)
Common stock issued during period		0
Ending balance, value at Jun. 30, 2011		538,312	23,114	316,268	198,722	208
Ending balance, shares at Jun. 30, 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		30,318			30,318
Other comprehensive income (loss)		43				43
Common stock dividends declared	[2]	(17,687)			(17,687)
Common stock issued during period		0
Ending balance, value at Jun. 30, 2012		$ 563,626	$ 23,114	$ 316,268	$ 224,089	$ 155
Ending balance, shares at Jun. 30, 2012			23,114,000

[1] $0.750 per share

[2] $0.766 per share