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Schedule I - Condensed Parent Company Finanical Statements (Details-Comprehensive Income Statement) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operations and maintenance |  |  |  |  |  |  |  |  | $ 171,248 |  | $ 172,996 |  | $ 165,859 |
Total Operating Expenses | 129,301 | 100,199 | 103,791 | 129,609 | 117,655 | 97,950 | 92,140 | 120,815 | 462,900 |  | 428,560 |  | 438,514 |
Operating Income | 25,962 | 39,900 | 24,497 | 37,628 | 19,350 | 39,888 | 25,081 | 28,444 | 127,987 |  | 112,763 |  | 107,868 |
Equity in earnings of investments |  |  |  |  |  |  |  |  | 9,434 |  | 9,079 |  | 8,615 |
Income before income taxes |  |  |  |  |  |  |  |  | 119,764 |  | 103,365 |  | 96,920 |
Income tax provision | (7,829) | (14,692) | (8,660) | (13,678) | (6,208) | (14,253) | (8,596) | (9,862) | (44,859) |  | (38,919) |  | (35,992) |
Net Income | 14,077 | 24,353 | 13,891 | 22,584 | 10,486 | 23,642 | 14,270 | 16,048 | 74,905 |  | 64,446 |  | 60,928 |
Other comprehensive income/(loss), net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on available for sale securities, net of tax |  |  |  |  |  |  |  |  | 283 | [1] | (18) | [2] | (15) | [3]
Reclassification of realized gain on available-for-sale securities, net of tax |  |  |  |  |  |  |  |  | 0 | [4] | 0 | [4] | (15) | [3]
Comprehensive Income |  |  |  |  |  |  |  |  | 75,188 |  | 64,428 |  | 60,898 |
MGE Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operations and maintenance |  |  |  |  |  |  |  |  | 613 |  | 649 |  | 718 |
Total Operating Expenses |  |  |  |  |  |  |  |  | 613 |  | 649 |  | 718 |
Operating Income |  |  |  |  |  |  |  |  | (613) |  | (649) |  | (718) |
Equity in earnings of investments |  |  |  |  |  |  |  |  | 76,362 |  | 65,132 |  | 61,075 |
Other income/(loss), net |  |  |  |  |  |  |  |  | (1,863) |  | (496) |  | 505 |
Other interest |  |  |  |  |  |  |  |  | 55 |  | 45 |  | (22) |
Income before income taxes |  |  |  |  |  |  |  |  | 73,941 |  | 64,032 |  | 60,840 |
Income tax provision |  |  |  |  |  |  |  |  | 964 |  | 414 |  | 88 |
Net Income |  |  |  |  |  |  |  |  | 74,905 |  | 64,446 |  | 60,928 |
Other comprehensive income/(loss), net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on available for sale securities, net of tax |  |  |  |  |  |  |  |  | 283 | [1] | (18) | [2] | (15) | [3]
Reclassification of realized gain on available-for-sale securities, net of tax |  |  |  |  |  |  |  |  | 0 | [4] | 0 | [4] | (15) | [3]
Comprehensive Income |  |  |  |  |  |  |  |  | $ 75,188 |  | $ 64,428 |  | $ 60,898 |
[1] | Net of $189 tax
[2] | Net of $12 tax
[3] | Net of $10 tax
[4] | Net of $0 tax

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