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Schedule I - Condensed Parent Company Finanical Statements (Details-Comprehensive Income Statement) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating Expenses: |  |  |  |  |  |  |  |  |  |  |
Other operations and maintenance |  |  |  |  |  |  |  |  | $ 164,478 | $ 161,703 | $ 171,248
Total Operating Expenses | $ 108,795 | $ 94,618 | $ 98,077 | $ 138,283 | $ 116,141 | $ 95,015 | $ 104,324 | $ 166,274 | 439,773 | 481,754 | 462,900
Operating Income (Loss) | 22,178 | 46,177 | 24,049 | 31,851 | 29,566 | 40,120 | 24,441 | 43,971 | 124,255 | 138,098 | 127,987
Equity in earnings of investments |  |  |  |  |  |  |  |  | 7,728 | 9,150 | 9,434
Income before income taxes |  |  |  |  |  |  |  |  | 112,706 | 128,504 | 119,764
Income tax provision | (7,417) | (15,351) | (8,008) | (10,587) | (8,600) | (14,286) | (9,034) | (16,265) | (41,363) | (48,185) | (44,859)
Net Income | $ 11,232 | $ 28,354 | $ 13,479 | $ 18,278 | $ 15,186 | $ 23,329 | $ 14,087 | $ 27,717 | 71,343 | 80,319 | 74,905
Other comprehensive income/(loss), net of tax: |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain on available for sale securities, net of tax |  |  |  |  |  |  |  |  | (101) | 81 | 283
Comprehensive Income |  |  |  |  |  |  |  |  | 71,242 | 80,400 | 75,188
MGE Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Expenses: |  |  |  |  |  |  |  |  |  |  |
Other operations and maintenance |  |  |  |  |  |  |  |  | 690 | 689 | 613
Total Operating Expenses |  |  |  |  |  |  |  |  | 690 | 689 | 613
Operating Income (Loss) |  |  |  |  |  |  |  |  | (690) | (689) | (613)
Equity in earnings of investments |  |  |  |  |  |  |  |  | 71,306 | 81,811 | 76,362
Other income/(loss), net |  |  |  |  |  |  |  |  | 526 | (1,879) | (1,863)
Other interest |  |  |  |  |  |  |  |  | 136 | 93 | 55
Income before income taxes |  |  |  |  |  |  |  |  | 71,278 | 79,336 | 73,941
Income tax provision |  |  |  |  |  |  |  |  | 65 | 983 | 964
Net Income |  |  |  |  |  |  |  |  | 71,343 | 80,319 | 74,905
Other comprehensive income/(loss), net of tax: |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain on available for sale securities, net of tax |  |  |  |  |  |  |  |  | (101) | 81 | 283
Comprehensive Income |  |  |  |  |  |  |  |  | $ 71,242 | $ 80,400 | $ 75,188

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