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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2012
MGE Power Elm Road [Member]
 
Variable Interest Entities Tables [Line Items]  
Variable interest entities significant balance sheet accounts
 (In thousands) 2012 2011 
 Property, plant, and equipment, net$185,020$189,163 
 Construction work in progress 1,440 732 
 Deferred income tax asset - current 30,842 0 
 Accrued interest and taxes 0 4,348 
 Deferred income tax liability 56,434 15,553 
 Long-term debt 73,306 75,972 
 Noncontrolling interest 69,803 70,966 
MGE Power West Campus [Member]
 
Variable Interest Entities Tables [Line Items]  
Variable interest entities significant balance sheet accounts
 (In thousands) 2012 2011 
 Property, plant, and equipment, net$90,339$91,355 
 Affiliate receivables 6,912 7,416 
 Accrued interest and taxes 3,327 4,689 
 Deferred income taxes 21,410 20,659 
 Long-term debt 50,000 50,000 
 Noncontrolling interest 30,682 30,676