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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2011
MGE Power Elm Road [Member]
 
Variable Interest Entities Tables [Line Items]  
Variable interest entities significant balance sheet accounts
 (In thousands) 2011 2010 
 Property, plant, and equipment, net$189,163$120,122 
 Construction work in progress 732 72,193 
 Accrued interest and taxes 4,348 1,761 
 Deferred income taxes 15,553 11,067 
 Long-term debt 75,972 48,473 
 Noncontrolling interest 70,966 99,390 
MGE Power West Campus [Member]
 
Variable Interest Entities Tables [Line Items]  
Variable interest entities significant balance sheet accounts
 (In thousands) 2011 2010 
 Property, plant, and equipment, net$91,355$93,631 
 Affiliate receivables 7,416 7,945 
 Accrued interest and taxes 4,689 2,409 
 Deferred income taxes 20,659 19,985 
 Long-term debt 50,000 50,000 
 Noncontrolling interest 30,676 32,675