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Noncontrolling Interest (Tables) - MGE [Member] | 12 Months Ended
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Dec. 31, 2015
Noncontrolling Interest [Line Items] |
Noncontrolling Interest in Balance Sheet | The noncontrolling interest on MGE's consolidated balance sheets at December 31 was as follows:
| (In thousands) |  | 2015 |  | 2014 |
| MGE Power Elm Road (a) | $ | 79,113 | $ | 72,537 |
| MGE Power West Campus (a) |  | 37,603 |  | 30,755 |
| MGE Transco (b) |  | 23,592 |  | 22,397 |
| Total Noncontrolling Interest | $ | 140,308 | $ | 125,689 |
Net Income Attributable to Noncontrolling Interest, Net of Tax | The net income attributable to noncontrolling interest, net of tax, for the years ended December 31, 2015, 2014, and 2013 was as follows:
| (In thousands) |  | 2015 |  | 2014 |  | 2013 |
| MGE Power Elm Road (a) | $ | 16,577 | $ | 16,160 | $ | 17,373 |
| MGE Power West Campus (a) |  | 7,348 |  | 7,666 |  | 7,657 |
| MGE Transco (b) |  | 2,172 |  | 2,484 |  | 2,408 |
| Net Income Attributable to Noncontrolling Interest, Net of Tax | $ | 26,097 | $ | 26,310 | $ | 27,438 |
(a) MGE Power Elm Road and MGE Power West Campus are not su bsidiaries of MGE; however, they have been consolidated in the consolidated financial statements of MGE (see Footnote 2). MGE Power Elm Road and MGE Power West Campus are 100% owned by MGE Power, and MGE Power is 100% owned by MGE Energy. MGE Energy's proportionate share of the equity and net income (through its wholly owned subsidiary MGE Power) of MGE Power Elm Road and MGE Power West Campus is classified within the MGE consolidated financial statements as noncontrolling interest. (b) At December 31, 2015, MGE is the majority owner, and MGE Energy is the minority owner, of MGE Transco. MGE Energy's proportionat e share of the equity and net income of MGE Transco is classified within the MGE consolidated financial statements as noncontrolling interest. In mid-2016, MGE is no longer expected to be the majority owner of MGE Transco. The change will have no effect on MGE Energy's consolidated financial statements; however, MGE Energy's proportionate share of the equity and net income of MGE Transco will be deconsolidated from MGE’s financial statements. No gain or loss is expected to be recognized on the date MGE ceases to have a controlling financial interest.

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