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Segment Information (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
MGE Energy [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues$ 133,572$ 127,938$ 415,436$ 396,663
Interdepartmental revenues0000
Total operating revenues133,572127,938415,436396,663
Depreciation and amortization(10,296)(9,560)(30,669)(28,263)
Other operating expenses(86,942)(84,026)(294,338)(292,151)
Operating Income36,33434,35290,42976,249
Other (deductions) income, net2,3412,6466,8809,314
Interest (expense) income, net(5,142)(4,099)(15,047)(12,052)
Income before income taxes33,53332,89982,26273,511
Income tax provision(12,495)(12,990)(30,718)(27,790)
Net Income21,03819,90951,54445,721
MGE Energy [Member] | Electric [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues114,963109,849291,804279,281
Interdepartmental revenues163161391398
Total operating revenues115,126110,010292,195279,679
Depreciation and amortization(7,144)(6,888)(21,173)(20,520)
Other operating expenses(78,118)(73,469)(218,556)(212,274)
Operating Income29,86429,65352,46646,885
Other (deductions) income, net35435682,372
Interest (expense) income, net(2,747)(2,646)(8,100)(7,874)
Income before income taxes27,15227,44244,43441,383
Income tax provision(9,944)(10,874)(15,666)(15,175)
Net Income17,20816,56828,76826,208
MGE Energy [Member] | Gas [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues17,24917,394119,748114,231
Interdepartmental revenues5,0834,5098,24710,353
Total operating revenues22,33221,903127,995124,584
Depreciation and amortization(1,377)(1,309)(4,246)(3,884)
Other operating expenses(23,422)(22,948)(112,192)(112,554)
Operating Income(2,467)(2,354)11,5578,146
Other (deductions) income, net1212321669
Interest (expense) income, net(775)(746)(2,284)(2,221)
Income before income taxes(3,230)(2,977)9,2946,594
Income tax provision1,3501,305(3,532)(2,336)
Net Income(1,880)(1,672)5,7624,258
MGE Energy [Member] | Non Regulated Energy [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues1,3606953,8843,151
Interdepartmental revenues9,5828,01128,55922,631
Total operating revenues10,9428,70632,44325,782
Depreciation and amortization(1,775)(1,363)(5,250)(3,859)
Other operating expenses(44)(35)(138)(101)
Operating Income9,1237,30827,05521,822
Other (deductions) income, net000(104)
Interest (expense) income, net(1,660)(655)(4,677)(2,031)
Income before income taxes7,4636,65322,37819,687
Income tax provision(2,994)(2,670)(8,981)(7,890)
Net Income4,4693,98313,39711,797
MGE Energy [Member] | Transmission Investment [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues0000
Interdepartmental revenues0000
Total operating revenues0000
Depreciation and amortization0000
Other operating expenses0000
Operating Income0000
Other (deductions) income, net2,1672,0916,4346,374
Interest (expense) income, net0000
Income before income taxes2,1672,0916,4346,374
Income tax provision(870)(870)(2,592)(2,589)
Net Income1,2971,2213,8423,785
MGE Energy [Member] | All Others [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues0000
Interdepartmental revenues0000
Total operating revenues0000
Depreciation and amortization0000
Other operating expenses(186)(255)(649)(604)
Operating Income(186)(255)(649)(604)
Other (deductions) income, net127(3)3573
Interest (expense) income, net40(52)1474
Income before income taxes(19)(310)(278)(527)
Income tax provision(37)11953200
Net Income(56)(191)(225)(327)
MGE Energy [Member] | Consolidation Elimination Entries [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues0000
Interdepartmental revenues(14,828)(12,681)(37,197)(33,382)
Total operating revenues(14,828)(12,681)(37,197)(33,382)
Depreciation and amortization0000
Other operating expenses14,82812,68137,19733,382
Operating Income0000
Other (deductions) income, net0000
Interest (expense) income, net0000
Income before income taxes0000
Income tax provision0000
Net Income0000
MGE [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues133,572127,938415,436396,663
Interdepartmental revenues0000
Total operating revenues133,572127,938415,436396,663
Depreciation and amortization(10,296)(9,560)(30,669)(28,263)
Other operating expenses(98,281)(95,763)(321,768)(315,643)
Operating Income24,99522,61562,99952,757
Other (deductions) income, net1,2791,5333,8325,418
Interest (expense) income, net(5,182)(4,047)(15,061)(12,126)
Net Income Including Noncontrolling Interest21,09220,10151,77046,049
Less Net Income Attributable to Noncontrolling Interest, net of tax(6,010)(5,108)(17,935)(15,104)
Net Income15,08214,99333,83530,945
MGE [Member] | Electric [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues114,963109,849291,804279,281
Interdepartmental revenues163161391398
Total operating revenues115,126110,010292,195279,679
Depreciation and amortization(7,144)(6,888)(21,173)(20,520)
Other operating expenses(88,013)(84,150)(234,145)(226,431)
Operating Income19,96918,97236,87732,728
Other (deductions) income, net(14)243(8)1,355
Interest (expense) income, net(2,747)(2,646)(8,100)(7,874)
Net Income Including Noncontrolling Interest17,20816,56928,76926,209
Less Net Income Attributable to Noncontrolling Interest, net of tax0000
Net Income17,20816,56928,76926,209
MGE [Member] | Gas [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues17,24917,394119,748114,231
Interdepartmental revenues5,0834,5098,24710,353
Total operating revenues22,33221,903127,995124,584
Depreciation and amortization(1,377)(1,309)(4,246)(3,884)
Other operating expenses(22,057)(21,589)(115,701)(114,603)
Operating Income(1,102)(995)8,0486,097
Other (deductions) income, net(4)69(2)382
Interest (expense) income, net(775)(746)(2,284)(2,221)
Net Income Including Noncontrolling Interest(1,881)(1,672)5,7624,258
Less Net Income Attributable to Noncontrolling Interest, net of tax0000
Net Income(1,881)(1,672)5,7624,258
MGE [Member] | Non Regulated Energy [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues1,3606953,8843,151
Interdepartmental revenues9,5828,01128,55922,631
Total operating revenues10,9428,70632,44325,782
Depreciation and amortization(1,775)(1,363)(5,250)(3,859)
Other operating expenses(3,039)(2,705)(9,119)(7,991)
Operating Income6,1284,63818,07413,932
Other (deductions) income, net000(104)
Interest (expense) income, net(1,660)(655)(4,677)(2,031)
Net Income Including Noncontrolling Interest4,4683,98313,39711,797
Less Net Income Attributable to Noncontrolling Interest, net of tax0000
Net Income4,4683,98313,39711,797
MGE [Member] | Transmission Investment [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues0000
Interdepartmental revenues0000
Total operating revenues0000
Depreciation and amortization0000
Other operating expenses0000
Operating Income0000
Other (deductions) income, net1,2971,2213,8423,785
Interest (expense) income, net0000
Net Income Including Noncontrolling Interest1,2971,2213,8423,785
Less Net Income Attributable to Noncontrolling Interest, net of tax0000
Net Income1,2971,2213,8423,785
MGE [Member] | Consolidation Elimination Entries [Member]
    
Segment Reporting Information [Line Items]    
Operating revenues0000
Interdepartmental revenues(14,828)(12,681)(37,197)(33,382)
Total operating revenues(14,828)(12,681)(37,197)(33,382)
Depreciation and amortization0000
Other operating expenses14,82812,68137,19733,382
Operating Income0000
Other (deductions) income, net0000
Interest (expense) income, net0000
Net Income Including Noncontrolling Interest0000
Less Net Income Attributable to Noncontrolling Interest, net of tax(6,010)(5,108)(17,935)(15,104)
Net Income$ (6,010)$ (5,108)$ (17,935)$ (15,104)