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Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 1) - Line of Credit [Member] - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Credit facilities [Line Items]      
Available lines of credit [1] $ 150,000 $ 150,000 $ 150,000
MGE Energy [Member] | MGE Energy unsecured committed revolving line of credit totaling $50 million      
Credit facilities [Line Items]      
Available lines of credit 50,000    
Line of credit, borrowings outstanding $ 0    
[1] MGE Energy short-term borrowings include MGE Energy and MGE lines of credit and MGE commercial paper.