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Taxes	3 Months Ended
Taxes	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Taxes	Taxes - MGE Energy and MGE. Effective Tax Rate. MGE Energy's effective income tax rate for the three months ended March 31, 2015 and 2014, was 36.7% and 37.0%, respectively. MGE's effective income tax rate for the three months ended March 31, 2015 and 2014, was 36.6% and 36.9%, respectively. The decrease in the effective tax rate is due in part to a higher estimated domestic manufacturing deduction offset by lower AFUDC equity earnings in 2015.

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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