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Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 2) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 20, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Dividends from Affiliates [Line Items] |  |  |  |
Dividends from affiliates |  | $ 52,366,000 | $ 44,343,000 | $ 79,148,000
Stock Split |  |  |  |
Stock split declared December 20, 2013, ratio (3:2) | 1.5 |  |  |
First Mortgage Bonds [Member] | 7.70%, 2028 Series |  |  |  |
Dividend Restrictions |  |  |  |
Debt covenant, allowable amount available for payment of dividends |  | 305,600,000 |  |
MGE [Member] |  |  |  |
Dividends from Affiliates [Line Items] |  |  |  |
Dividends from affiliates |  | 25,000,000 | 20,404,000 | 26,648,000
Dividend Restrictions |  |  |  |
Dividend restrictions, minimum common equity ratio |  | 0.55 |  |
Common equity ratio |  | 0.576 |  |
MGE [Member] | First Mortgage Bonds [Member] | 7.70%, 2028 Series |  |  |  |
Dividend Restrictions |  |  |  |
Debt covenant, allowable amount available for payment of dividends |  | 305,600,000 |  |
MGE Construct [Member] |  |  |  |
Dividends from Affiliates [Line Items] |  |  |  |
Dividends from affiliates |  | 0 | 239,000 | 0
MGE Power Elm Road [Member] |  |  |  |
Dividends from Affiliates [Line Items] |  |  |  |
Dividends from affiliates |  | 17,300,000 | 16,000,000 | 43,000,000
MGE Power [Member] |  |  |  |
Dividends from Affiliates [Line Items] |  |  |  |
Dividends from affiliates |  | 0 | 200,000 | 0
MGE Power West Campus [Member] |  |  |  |
Dividends from Affiliates [Line Items] |  |  |  |
Dividends from affiliates |  | 9,250,000 | 7,500,000 | 9,500,000
MGE Transco [Member] |  |  |  |
Dividends from Affiliates [Line Items] |  |  |  |
Dividends from affiliates |  | $ 816,000 | $ 0 | $ 0

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