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Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 1) (Line of Credit [Member], USD $) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Credit facilities [Line Items] |  |  |  |  |  |
Available lines of credit | $ 150,000,000 | [1] | $ 115,000,000 | [1] | $ 115,000,000 | [1]
MGE Energy [Member] | MGE Energy $50 million unsecured commiteed revolving line of credit |  |  |  |  |  |
Credit facilities [Line Items] |  |  |  |  |  |
Available lines of credit | 50,000,000 |  |  |  |  |
Line of credit, borrowings outstanding | $ 0 |  |  |  |  |
[1] | MGE Energy short-term borrowings include MGE Energy and MGE lines of credit and MGE commercial paper.

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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