Taxes	6 Months Ended
Jun. 30, 2016
Income Tax Disclosure [Abstract]
Taxes	Taxes - MGE Energy and MGE. MGE Energy's effective income tax rates for the three and six months ended June 30, 2016, were 36.5% and 36.7%, respectively, compared to 37.3% and 36.9% for the same periods in 2015. MGE's effective income tax rates for the three and six months ended June 30, 2016, were 36.5% and 36.7%, respectively, compared to 37.2% and 36.9% for the same periods in 2015. The decrease in the effective tax rates is due in part to higher estimated AFUDC equity earnings offset by a lower estimated domestic manufacturing deduction in 2016.

Taxes

6 Months Ended

Jun. 30, 2016

Taxes - MGE Energy and MGE.

MGE Energy's effective income tax rates for the three and six months ended June 30, 2016, were 36.5% and 36.7%, respectively, compared to 37.3% and 36.9% for the same periods in 2015. MGE's effective income tax rates for the three and six months ended June 30, 2016, were 36.5% and 36.7%, respectively, compared to 37.2% and 36.9% for the same periods in 2015. The decrease in the effective tax rates is due in part to higher estimated AFUDC equity earnings offset by a lower estimated domestic manufacturing deduction in 2016.