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Segment Information (Tables)
12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Segment Information

The following table shows segment information for MGE Energy's and MGE's operations:

(In thousands)MGE EnergyElectricGasNon-Regulated EnergyTransmission InvestmentAll OthersConsolidation/ Elimination EntriesConsolidated Total
Year Ended December 31, 2017
Operating revenues$413,926$148,825$348$-$-$-$563,099
Interdepartmental revenues(510)14,97444,468--(58,932)-
Total operating revenues413,416163,79944,816--(58,932)563,099
Depreciation and amortization(36,660)(9,000)(7,417)---(53,077)
Other operating expenses(305,539)(133,479)(190)(9)(1,001)58,932(381,286)
Operating income (loss)71,21721,32037,209(9)(1,001)-128,736
Other income (deductions), net1,978362-9,844(1,896)-10,288
Interest (expense) income, net(11,257)(3,234)(5,533)-700-(19,324)
Income (loss) before taxes61,93818,44831,6769,835(2,197)-119,700
Income tax (provision) benefit(a)(20,547)(7,303)8,860(3,954)850-(22,094)
Net income (loss)$41,391$11,145$40,536$5,881$(1,347)$-$97,606
Year Ended December 31, 2016
Operating revenues$409,006$134,543$1,196$-$-$-$544,745
Interdepartmental revenues1,91221,37843,930--(67,220)-
Total operating revenues410,918155,92145,126--(67,220)544,745
Depreciation and amortization(29,122)(8,128)(7,372)-(24)-(44,646)
Other operating expenses(310,941)(127,083)(155)(17)(895)67,220(371,871)
Operating income (loss)70,85520,71037,599(17)(919)-128,228
Other income, net96030-8,429292-9,711
Interest (expense) income, net(11,147)(3,223)(5,768)-272-(19,866)
Income (loss) before taxes60,66817,51731,8318,412(355)-118,073
Income tax (provision) benefit(20,115)(6,894)(12,775)(2,836)107-(42,513)
Net income (loss)$40,553$10,623$19,056$5,576$(248)$-$75,560
Year Ended December 31, 2015
Operating revenues$412,528$143,737$7,763$-$-$-$564,028
Interdepartmental revenues51311,78039,435--(51,728)-
Total operating revenues413,041155,51747,198--(51,728)564,028
Depreciation and amortization(29,945)(6,758)(7,475)-(47)-(44,225)
Other operating expenses(318,001)(128,241)(158)(19)(857)51,728(395,548)
Operating income (loss)65,09520,51839,565(19)(904)-124,255
Other income (deductions), net400(33)-7,728518-8,613
Interest (expense) income, net(11,187)(3,203)(5,993)-221-(20,162)
Income (loss) before taxes54,30817,28233,5727,709(165)-112,706
Income tax (provision) benefit(17,915)(6,915)(13,474)(3,102)43-(41,363)
Net income (loss)$36,393$10,367$20,098$4,607$(122)$-$71,343
(a) In December 2017, there was a $21.7 million one-time tax impact as a result of the Tax Act. See Footnote 12 for further information.

(In thousands)MGEElectricGasNon-Regulated EnergyTransmission Investment(c)Consolidation/ Elimination EntriesConsolidated Total
Year Ended December 31, 2017
Operating revenues$413,929$148,834$348$-$-$563,111
Interdepartmental revenues(513)14,96544,468-(58,920)-
Total operating revenues413,416163,79944,816-(58,920)563,111
Depreciation and amortization(36,660)(9,000)(7,417)--(53,077)
Other operating (expenses) income(a,b)(325,532)(140,625)8,670-58,920(398,567)
Operating income(b)51,22414,17446,069--111,467
Other income, net(b)1,424205---1,629
Interest expense, net(11,257)(3,234)(5,533)--(20,024)
Net income41,39111,14540,536--93,072
Less: Net income attributable to
noncontrolling interest, net of tax----(43,237)(43,237)
Net income attributable to MGE$41,391$11,145$40,536$-$(43,237)$49,835
Year Ended December 31, 2016
Operating revenues$409,030$134,572$1,196$-$-$544,798
Interdepartmental revenues1,88821,34943,930-(67,167)-
Total operating revenues410,918155,92145,126-(67,167)544,798
Depreciation and amortization(29,122)(8,128)(7,372)--(44,622)
Other operating expenses(b)(330,924)(133,940)(12,930)-67,167(410,627)
Operating income(b)50,87213,85324,824--89,549
Other income (deductions), net(b)828(7)-4,360-5,181
Interest expense, net(11,147)(3,223)(5,768)--(20,138)
Net income40,55310,62319,0564,360-74,592
Less: net income attributable to
noncontrolling interest, net of tax----(23,358)(23,358)
Net income attributable to MGE$40,553$10,623$19,056$4,360$(23,358)$51,234
Year Ended December 31, 2015
Operating revenues$412,550$143,752$7,763$-$-$564,065
Interdepartmental revenues49111,76539,435-(51,691)-
Total operating revenues413,041155,51747,198-(51,691)564,065
Depreciation and amortization(29,945)(6,758)(7,475)--(44,178)
Other operating expenses(b)(335,803)(135,124)(13,632)(19)51,691(432,887)
Operating income (loss)(b)47,29313,63526,091(19)-87,000
Other income (deductions), net(b)287(65)-4,626-4,848
Interest expense, net(11,187)(3,203)(5,993)--(20,383)
Net income36,39310,36720,0984,607-71,465
Less: Net income attributable to
noncontrolling interest, net of tax----(26,097)(26,097)
Net income attributable to MGE$36,393$10,367$20,098$4,607$(26,097)$45,368
(a) In December 2017, there was a $21.7 million one-time tax impact as a result of the Tax Act. See Footnote 12 for further information.
(b) Amounts are shown net of the related tax expense, consistent with the presentation on the MGE Consolidated Statements of Income.
(c) As of July 31, 2016, MGE no longer consolidates MGE Energy's proportionate share of equity earnings in MGE Transco.
See Footnote 4 for further information.

The following table shows segment information for MGE Energy's and MGE's assets and capital expenditures:
UtilityConsolidated
(In thousands) MGE EnergyElectricGasAssets not AllocatedNon-regulated EnergyTransmission Investment(d)All OthersConsolidation/ Elimination EntriesTotal
Assets:
December 31, 2017$1,043,181$344,337$26,345$270,384$61,783$485,548$(376,396)$1,855,182
December 31, 20161,021,905318,60327,338271,27774,535465,202(377,800)1,801,060
December 31, 2015974,235298,43549,753277,85869,470434,868(378,216)1,726,403
Capital Expenditures:
Year ended Dec. 31, 2017$77,353$26,847$-$3,931$-$-$-$108,131
Year ended Dec. 31, 201650,69929,136-3,824---83,659
Year ended Dec. 31, 201549,37018,787-3,873---72,030

UtilityConsolidated
(In thousands)MGEElectricGasAssets not AllocatedNon-regulated EnergyTransmission Investment(e)Consolidation/ Elimination EntriesTotal
Assets:
December 31, 2017$1,043,181$344,337$26,345$270,334$-$(156)$1,684,041
December 31, 20161,021,905318,60327,338271,227-(221)1,638,852
December 31, 2015974,235298,43549,753277,80869,470(187)1,669,514
Capital Expenditures:
Year ended Dec. 31, 2017$77,353$26,847$-$3,931$-$-$108,131
Year ended Dec. 31, 201650,69929,136-3,824--83,659
Year ended Dec. 31, 201549,37018,787-3,873--72,030
(d) In December 2017, there was a $20.4 million one-time tax impact as a result of the Tax Act. See Footnote 12 for further information.
(e) In December 2016, MGE's ownership interest in MGE Transco was transferred to MGE Energy. See Footnote 4 for further information.