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Regional Transmission Organizations | 12 Months Ended
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Dec. 31, 2015
Regional Transmission Organizations Disclosure [Abstract] |
Regional Transmission Organizations | Regional Transmission Organizations - MGE Energy and MGE. MGE reports on a net basis transactions on the MISO ma rkets in which it buys and sells power within the same hour to meet electric energy delivery requirements. T his treatment resulted in a $68.6 mi llion, a $91.1 million, and a $78.0 mi llion reduction to sales to the market and purchase power expense for MISO markets for the years ended December 31, 2015, 2014, and 2013, respectively.

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