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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2013
MGE Power Elm Road [Member]
 
Variable Interest Entity [Line Items]  
Variable interest entities significant balance sheet accounts

At December 31, MGE has included the following significant accounts on its consolidated balance sheet related to its interest in this VIE:

 (In thousands) 2013 2012 
 Property, plant, and equipment, net$182,657$185,020 
 Construction work in progress 1,115 1,440 
 Deferred income tax asset - current 219 30,842 
 Deferred income tax liability 34,141 56,434 
 Long-term debt 70,639 73,306 
 Noncontrolling interest 69,876 69,803 
MGE Power West Campus [Member]
 
Variable Interest Entity [Line Items]  
Variable interest entities significant balance sheet accounts

At December 31, MGE has included the following significant accounts on its consolidated balance sheet related to its interest in this VIE:

 (In thousands) 2013 2012 
 Property, plant, and equipment, net$89,564$90,339 
 Affiliate receivables 6,767 6,912 
 Accrued interest and taxes 4,888 3,327 
 Deferred income taxes 23,154 21,410 
 Long-term debt 49,653 50,000 
 Noncontrolling interest 29,089 30,682