Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions - MGE Energy and MGE. ATC During 2014, 2013, and 2012, MGE recorded $26.8 million, $27.7 million, and $25.3 million, respectively, for transmission services received from ATC. MGE also provides a variety of operational, maintenance, and project management work for ATC, which is reimbursed by ATC. For the year ended December 31, 2014, MGE had a receivable due from ATC of $0.1 million. For the years ended December 31, 2013 and 2012, MGE had a receivable due from ATC of $0.2 million. For additional discussion on MGE's relationship with ATC, see Footnote 4.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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