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Taxes	9 Months Ended
Taxes	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Taxes	Taxes - MGE Energy and MGE. MGE Energy's effective income tax rates for the three and nine months ended September 30, 2014, were 38.0% and 37.8%, respectively, compared to 37.6% and 37.8% for the same periods in 2013. MGE’s effective income tax rates for the three and nine months ended September 30, 2014, were 37.9% and 37.8%, respectively, compared to 37.6% and 37.8% for the same periods in 2013. The net increase in the three month effective tax rate is attributable to less AFUDC equity earned during the three month period in 2014 compared to 2013.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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