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Quarterly Summary of Operations | 12 Months Ended
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Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Summary of Operations | Quarterly Summary of Operations - MGE Energy (unaudited).
| (In thousands, except per share amounts) |  | Quarters Ended |
| 2013 |  | March 31 |  | June 30 |  | September 30 |  | December 31 |
| Operating revenues: |  |  |  |  |  |  |  |  |
| Regulated electric revenues | $ | 93,494 | $ | 96,846 | $ | 119,836 | $ | 93,781 |
| Regulated gas revenues |  | 72,467 |  | 30,042 |  | 18,864 |  | 60,089 |
| Nonregulated revenues |  | 1,276 |  | 1,400 |  | 1,399 |  | 1,393 |
| Total Operating Revenues |  | 167,237 |  | 128,288 |  | 140,099 |  | 155,263 |
| Operating expenses |  | 129,609 |  | 103,791 |  | 100,199 |  | 129,301 |
| Operating income |  | 37,628 |  | 24,497 |  | 39,900 |  | 25,962 |
| Interest and other income, net |  | (1,366) |  | (1,946) |  | (855) |  | (4,056) |
| Income tax provision |  | (13,678) |  | (8,660) |  | (14,692) |  | (7,829) |
| Earnings on common stock | $ | 22,584 | $ | 13,891 | $ | 24,353 | $ | 14,077 |
| Earnings per common share | $ | 0.65 | $ | 0.40 | $ | 0.70 | $ | 0.41 |
| Dividends per share | $ | 0.263 | $ | 0.263 | $ | 0.272 | $ | 0.272 |
| 2012 |  |  |  |  |  |  |  |  |
| Operating revenues: |  |  |  |  |  |  |  |  |
| Regulated electric revenues | $ | 89,936 | $ | 96,339 | $ | 118,914 | $ | 87,176 |
| Regulated gas revenues |  | 57,019 |  | 18,629 |  | 16,587 |  | 47,492 |
| Nonregulated revenues |  | 2,304 |  | 2,253 |  | 2,337 |  | 2,337 |
| Total Operating Revenues |  | 149,259 |  | 117,221 |  | 137,838 |  | 137,005 |
| Operating expenses |  | 120,815 |  | 92,140 |  | 97,950 |  | 117,655 |
| Operating income |  | 28,444 |  | 25,081 |  | 39,888 |  | 19,350 |
| Interest and other income, net |  | (2,534) |  | (2,215) |  | (1,993) |  | (2,656) |
| Income tax provision |  | (9,862) |  | (8,596) |  | (14,253) |  | (6,208) |
| Earnings on common stock | $ | 16,048 | $ | 14,270 | $ | 23,642 | $ | 10,486 |
| Earnings per common share | $ | 0.47 | $ | 0.41 | $ | 0.68 | $ | 0.30 |
| Dividends per share | $ | 0.255 | $ | 0.255 | $ | 0.263 | $ | 0.263 |
Notes: • The quarterly results of operations within a year may not be comparable because of seasonal and other factors. • The sum of earnings per share of common stock for any four quarters may vary slightly from the earnings per share of common stock for the equivalent twelve-month period due to rounding. • MGE Energy's operations are based primarily on its utility subsidiary MGE • Per share amounts for all periods presented reflect the three-for-two stock split declared on December 20, 2013 effective in the form of a stock dividend distributed on February 7, 2014.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 23, 24 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 30 -Subparagraph a-j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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