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Share-Based Compensation (Tables) - Performance Units [Member]
 12 Months Ended
Dec. 31, 2015
Performance Unit Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance Unit Graded Vesting Schedule

Under MGE Energy's Performance Unit Plan, eligible employees may receive performance units that entitle the holder to receive a cash payment equal to the value of a designated number of shares of MGE Energy's common stock, plus dividend equivalent payments thereon, at the end of the set performance period. In accordance with the plan's provisions, these awards are subject to a prescribed vesting schedule and must be settled in cash. Accordingly, no shares of common stock will be issued in connection with the plan.

On the grant date, MGE Energy and MGE measure the cost of the employee services received in exchange for a performance unit award based on the current market value of MGE Energy common stock. The fair value of the awards is re-measured quarterly, including at December 31, 2015, as required by applicable accounting standards. Changes in fair value as well as the original grant are recognized as compensation cost. Since this amount is re-measured throughout the vesting period, the compensation cost is subject to variability. Units are subject to a five-year graded vesting schedule.

Grant DateMGE Energy Units Granted
February 19, 201619,055
February 20, 201518,948
February 21, 201421,991
February 15, 201322,884
February 17, 201225,040
Director Incentive Agreement [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance Unit Graded Vesting Schedule

Under the Director Incentive Plan, a non-employee director can receive performance units that entitle the holder to receive a cash payment equal to the value of a designated number of shares of MGE Energy’s common stock, plus dividend payments, at the end of the set performance period. The units are subject to a three-year graded vesting schedule. This plan is similar to MGE Energy’s Performance Unit Plan for eligible employees described above.

Grant DateMGE Energy Units Granted
January 15, 20163,773
January 16, 20153,794
January 17, 20144,683