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Madison Gas and Electric Company Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating Revenues:    
Regulated electric revenues $ 98,240us-gaap_ElectricDomesticRegulatedRevenue $ 98,852us-gaap_ElectricDomesticRegulatedRevenue
Regulated gas revenues 69,928us-gaap_GasDomesticRegulatedRevenue 110,713us-gaap_GasDomesticRegulatedRevenue
Nonregulated revenues 1,966us-gaap_UnregulatedOperatingRevenue 680us-gaap_UnregulatedOperatingRevenue
Total Operating Revenues 170,134us-gaap_RegulatedAndUnregulatedOperatingRevenue 210,245us-gaap_RegulatedAndUnregulatedOperatingRevenue
Operating Expenses:    
Fuel for electric generation 11,892us-gaap_UtilitiesOperatingExpenseFuelUsed 14,132us-gaap_UtilitiesOperatingExpenseFuelUsed
Purchased power 22,865us-gaap_UtilitiesOperatingExpensePurchasedPower 18,555us-gaap_UtilitiesOperatingExpensePurchasedPower
Cost of gas sold 46,919mgee_UtilitiesOperatingExpenseCostOfGasSold 78,508mgee_UtilitiesOperatingExpenseCostOfGasSold
Other operations and maintenance 40,674us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations 40,472us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations
Depreciation and amortization 10,849us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization 9,746us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Other general taxes 5,084us-gaap_UtilitiesOperatingExpenseTaxes 4,861us-gaap_UtilitiesOperatingExpenseTaxes
Income tax provision 10,587us-gaap_IncomeTaxExpenseBenefit 16,265us-gaap_IncomeTaxExpenseBenefit
Total Operating Expenses 138,283us-gaap_UtilitiesOperatingExpense 166,274us-gaap_UtilitiesOperatingExpense
Operating Income 31,851us-gaap_OperatingIncomeLoss 43,971us-gaap_OperatingIncomeLoss
Other Income and Deductions:    
Equity in earnings in ATC 1,881us-gaap_IncomeLossFromEquityMethodInvestments 2,481us-gaap_IncomeLossFromEquityMethodInvestments
Total Other Income and Deductions 2,105us-gaap_NonoperatingIncomeExpense 4,552us-gaap_NonoperatingIncomeExpense
Interest Expense:    
Net Interest Expense 5,091us-gaap_InterestIncomeExpenseNet 4,541us-gaap_InterestIncomeExpenseNet
Net Income (Loss) 18,278us-gaap_NetIncomeLoss 27,717us-gaap_NetIncomeLoss
MGE [Member]    
Operating Revenues:    
Regulated electric revenues 98,245us-gaap_ElectricDomesticRegulatedRevenue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
98,858us-gaap_ElectricDomesticRegulatedRevenue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Regulated gas revenues 69,933us-gaap_GasDomesticRegulatedRevenue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
110,718us-gaap_GasDomesticRegulatedRevenue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Nonregulated revenues 1,966us-gaap_UnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
680us-gaap_UnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Total Operating Revenues 170,144us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
210,256us-gaap_RegulatedAndUnregulatedOperatingRevenue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Operating Expenses:    
Fuel for electric generation 11,894us-gaap_UtilitiesOperatingExpenseFuelUsed
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
14,134us-gaap_UtilitiesOperatingExpenseFuelUsed
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Purchased power 22,868us-gaap_UtilitiesOperatingExpensePurchasedPower
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
18,558us-gaap_UtilitiesOperatingExpensePurchasedPower
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Cost of gas sold 46,923mgee_UtilitiesOperatingExpenseCostOfGasSold
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
78,513mgee_UtilitiesOperatingExpenseCostOfGasSold
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Other operations and maintenance 40,472us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
40,317us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Depreciation and amortization 10,837us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
9,734us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Other general taxes 5,084us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4,861us-gaap_UtilitiesOperatingExpenseTaxes
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Income tax provision 9,776us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
14,924us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Total Operating Expenses 147,854us-gaap_UtilitiesOperatingExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
181,041us-gaap_UtilitiesOperatingExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Operating Income 22,290us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
[1] 29,215us-gaap_OperatingIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
[1]
Other Income and Deductions:    
AFUDC - equity funds 128us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,950us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Equity in earnings in ATC 1,881us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
2,481us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Income tax provision (808)mgee_NonOperatingExpenseTaxes
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(1,264)mgee_NonOperatingExpenseTaxes
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Other expense, net (39)us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(158)us-gaap_OtherNonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Total Other Income and Deductions 1,162us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
[1] 3,009us-gaap_NonoperatingIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
[1]
Income before interest expense 23,452mgee_IncomeLossFromContinuingOperationsBeforeInterestExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
32,224mgee_IncomeLossFromContinuingOperationsBeforeInterestExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Interest Expense:    
Interest on long-term debt 5,151us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
5,249us-gaap_InterestExpenseLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Other interest, net 32mgee_InterestIncomeExpenseOtherNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(25)mgee_InterestIncomeExpenseOtherNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
AFUDC - borrowed funds (42)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(643)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Net Interest Expense 5,141us-gaap_InterestIncomeExpenseNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4,581us-gaap_InterestIncomeExpenseNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Net Income Including Noncontrolling Interest 18,311us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
27,643us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Less Net Income Attributable to Noncontrolling Interest, net of tax (6,553)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(6,510)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Net Income (Loss) $ 11,758us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 21,133us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
[1]
*Amounts are shown net of the related tax expense, consistent with the presentation on the consolidated MGE Income Statement.