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		51,544			51,544
Other comprehensive income (loss)		(8)				(8)
Common stock dividends declared	[1]	(26,183)			(26,183)
Common stock issued during period		0
Ending balance, value at Sep. 30, 2011		550,433	23,114	316,268	210,917	134
Ending balance, shares at Sep. 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		53,960			53,960
Other comprehensive income (loss)		35				35
Common stock dividends declared	[2]	(26,820)			(26,820)
Common stock issued during period		0
Ending balance, value at Sep. 30, 2012		$ 578,127	$ 23,114	$ 316,268	$ 238,598	$ 147
Ending balance, shares at Sep. 30, 2012			23,114,000

[1] $1.133 per share

[2] $1.161 per share