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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | Revenues disaggregated by revenue source were as follows:
| (In thousands) |  | Year Ended December 31, |
| Electric revenues |  | 2,019 |  | 2018 |  | 2017 |
| Residential | $ | 140,006 | $ | 138,566 | $ | 136,168 |
| Commercial(a) |  | 213,265 |  | 204,683 |  | 216,461 |
| Industrial |  | 12,772 |  | 13,878 |  | 16,176 |
| Other-retail/municipal |  | 35,174 |  | 34,023 |  | 38,010 |
| Total retail |  | 401,217 |  | 391,150 |  | 406,815 |
| Sales to the market |  | 5,664 |  | 7,438 |  | 4,067 |
| Other revenues |  | 1,404 |  | 2,294 |  | 3,044 |
| Total electric revenues |  | 408,285 |  | 400,882 |  | 413,926 |
| Gas revenues |  |  |  |  |  |  |
| Residential |  | 95,146 |  | 94,017 |  | 88,695 |
| Commercial/Industrial(a) |  | 59,051 |  | 59,060 |  | 55,151 |
| Total retail |  | 154,197 |  | 153,077 |  | 143,846 |
| Gas transportation |  | 5,293 |  | 4,283 |  | 4,561 |
| Other revenues |  | 385 |  | 407 |  | 418 |
| Total gas revenues |  | 159,875 |  | 157,767 |  | 148,825 |
| Nonregulated energy revenues |  | 695 |  | 1,119 |  | 348 |
| Total Operating Revenue(a) | $ | 568,855 | $ | 559,768 | $ | 563,099 |
(a)In 2017, MGE had less than $0.1 million of revenues related to compressed natural gas vehicle fuel servicing. No revenue was recognized for fuel servicing by MGE Energy in 2017.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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