2.4.0.6 Html 443 611 1 true 91 0 false 8 false false R1.htm 010010 - Document - Document and Entity Information Sheet http://www.mgeenergy.com/role/DocumentDocumentAndEntityInformation Document and Entity Information false false R2.htm 010020 - Statement - MGE Energy Inc Consolidated Statements of Income Sheet http://www.mgeenergy.com/role/StatementMGEEnergyIncConsolidatedStatementsOfIncome MGE Energy Inc Consolidated Statements of Income false false R3.htm 010025 - Statement - Madison Gas and Electric Company Consolidated Statements of Income Sheet http://www.mgeenergy.com/role/StatementMadisonGasAndElectricCompanyConsolidatedStatementsOfIncome Madison Gas and Electric Company Consolidated Statements of Income true false R4.htm 010030 - Statement - Consolidated Balance Sheets Sheet http://www.mgeenergy.com/role/StatementConsolidatedBalanceSheets Consolidated Balance Sheets false false R5.htm 010040 - Statement - Consolidated Balance Sheets (Parentheticals) Sheet http://www.mgeenergy.com/role/StatementConsolidatedBalanceSheetsParentheticals Consolidated Balance Sheets (Parentheticals) false false R6.htm 010050 - Statement - MGE Energy Inc Consolidated Statements of Cash Flows Sheet http://www.mgeenergy.com/role/StatementMGEEnergyIncConsolidatedStatementsOfCashFlows MGE Energy Inc Consolidated Statements of Cash Flows false false R7.htm 010055 - Statement - Madison Gas and Electric Company Consolidated Statements of Cash Flows Sheet http://www.mgeenergy.com/role/StatementMadisonGasAndElectricCompanyConsolidatedStatementsOfCashFlows Madison Gas and Electric Company Consolidated Statements of Cash Flows false false R8.htm 010060 - Statement - MGE Energy Inc Consolidated Statements of Common Equity Sheet http://www.mgeenergy.com/role/StatementMGEEnergyIncConsolidatedStatementsOfCommonEquity MGE Energy Inc Consolidated Statements of Common Equity false false R9.htm 010065 - Statement - Madison Gas and Electric Company Consolidated Statements of Common Equity Sheet http://www.mgeenergy.com/role/StatementMadisonGasAndElectricCompanyConsolidatedStatementsOfCommonEquity Madison Gas and Electric Company Consolidated Statements of Common Equity false false R10.htm 010070 - Statement - Consolidated Statements of Common Equity (Parentheticals) Sheet http://www.mgeenergy.com/role/StatementConsolidatedStatementsOfCommonEquityParentheticals Consolidated Statements of Common Equity (Parentheticals) false false R11.htm 010090 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.mgeenergy.com/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies false false R12.htm 010100 - Disclosure - Variable Interest Entities Sheet http://www.mgeenergy.com/role/DisclosureVariableInterestEntities Variable Interest Entities false false R13.htm 010110 - Disclosure - Property, Plant, and Equipment Sheet http://www.mgeenergy.com/role/DisclosurePropertyPlantAndEquipment Property, Plant, and Equipment false false R14.htm 010120 - Disclosure - Investments Sheet http://www.mgeenergy.com/role/DisclosureInvestments Investments false false R15.htm 010130 - Disclosure - Joint Plant Ownership Sheet http://www.mgeenergy.com/role/DisclosureJointPlantOwnership Joint Plant Ownership false false R16.htm 010140 - Disclosure - Regulatory Assets and Liabilities Sheet http://www.mgeenergy.com/role/DisclosureRegulatoryAssetsAndLiabilities Regulatory Assets and Liabilities false false R17.htm 010150 - Disclosure - Common Equity Sheet http://www.mgeenergy.com/role/DisclosureCommonEquity Common Equity false false R18.htm 010160 - Disclosure - Noncontrolling Interest Sheet http://www.mgeenergy.com/role/DisclosureNoncontrollingInterest Noncontrolling Interest false false R19.htm 010170 - Disclosure - Long-Term Debt Sheet http://www.mgeenergy.com/role/DisclosureLongTermDebt Long-Term Debt false false R20.htm 010180 - Disclosure - Notes Payable to Banks, Commercial Paper, and Lines of Credit Notes http://www.mgeenergy.com/role/DisclosureNotesPayableToBanksCommercialPaperAndLinesOfCredit Notes Payable to Banks, Commercial Paper, and Lines of Credit false false R21.htm 010190 - Disclosure - Fair Value of Financial Instruments Sheet http://www.mgeenergy.com/role/DisclosureFairValueOfFinancialInstruments Fair Value of Financial Instruments false false R22.htm 010200 - Disclosure - Income Taxes Sheet http://www.mgeenergy.com/role/DisclosureIncomeTaxes Income Taxes false false R23.htm 010210 - Disclosure - Pension Plans and Other Postretirement Benefits Sheet http://www.mgeenergy.com/role/DisclosurePensionPlansAndOtherPostretirementBenefits Pension Plans and Other Postretirement Benefits false false R24.htm 010220 - Disclosure - Share-Based Compensation Sheet http://www.mgeenergy.com/role/DisclosureShareBasedCompensation Share-Based Compensation false false R25.htm 010230 - Disclosure - Regional Transmission Organizations Sheet http://www.mgeenergy.com/role/DisclosureRegionalTransmissionOrganizations Regional Transmission Organizations false false R26.htm 010240 - Disclosure - Derivative and Hedging Instruments Sheet http://www.mgeenergy.com/role/DisclosureDerivativeAndHedgingInstruments Derivative and Hedging Instruments false false R27.htm 010250 - Disclosure - Rate Matters Sheet http://www.mgeenergy.com/role/DisclosureRateMatters Rate Matters false false R28.htm 010260 - Disclosure - Commitments and Contingencies Sheet http://www.mgeenergy.com/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies false false R29.htm 010270 - Disclosure - Blount Station Sheet http://www.mgeenergy.com/role/DisclosureBlountStation Blount Station false false R30.htm 010280 - Disclosure - Asset Retirement Obligations Sheet http://www.mgeenergy.com/role/DisclosureAssetRetirementObligations Asset Retirement Obligations false false R31.htm 010285 - Disclosure - Elm Road Sheet http://www.mgeenergy.com/role/DisclosureElmRoad Elm Road false false R32.htm 010290 - Disclosure - Adoption of Accounting Principles and Recently Issued Accounting Pronouncements Sheet http://www.mgeenergy.com/role/DisclosureAdoptionOfAccountingPrinciplesAndRecentlyIssuedAccountingPronouncements Adoption of Accounting Principles and Recently Issued Accounting Pronouncements false false R33.htm 010300 - Disclosure - Segment Information Sheet http://www.mgeenergy.com/role/DisclosureSegmentInformation Segment Information false false R34.htm 010310 - Disclosure - Quarterly Summary of Operations Sheet http://www.mgeenergy.com/role/DisclosureQuarterlySummaryOfOperations Quarterly Summary of Operations false false R35.htm 010320 - Disclosure - Related Party Transactions Sheet http://www.mgeenergy.com/role/DisclosureRelatedPartyTransactions Related Party Transactions false false R36.htm 010330 - Disclosure - Subsequent Events Sheet http://www.mgeenergy.com/role/DisclosureSubsequentEvents Subsequent Events false false R37.htm 010340 - Disclosure - Condensed Parent Company Financial Statements Sheet http://www.mgeenergy.com/role/DisclosureCondensedParentCompanyFinancialStatements Condensed Parent Company Financial Statements false false R38.htm 010350 - Disclosure - Valuation and Qualifying Accounts Sheet http://www.mgeenergy.com/role/DisclosureValuationAndQualifyingAccounts Valuation and Qualifying Accounts false false R39.htm 020000 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.mgeenergy.com/role/DisclosureSignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) false false R40.htm 030000 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.mgeenergy.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) false false R41.htm 030010 - Disclosure - Variable Interest Entities (Tables) Sheet http://www.mgeenergy.com/role/DisclosureVariableInterestEntitiesTables Variable Interest Entities (Tables) false false R42.htm 030020 - Disclosure - Property, Plant, and Equipment (Tables) Sheet http://www.mgeenergy.com/role/DisclosurePropertyPlantAndEquipmentTables Property, Plant, and Equipment (Tables) false false R43.htm 030030 - Disclosure - Investments (Tables) Sheet http://www.mgeenergy.com/role/DisclosureInvestmentsTables Investments (Tables) false false R44.htm 030040 - Disclosure - Joint Plant Ownership (Tables) Sheet http://www.mgeenergy.com/role/DisclosureJointPlantOwnershipTables Joint Plant Ownership (Tables) false false R45.htm 030050 - Disclosure - Regulatory Assets and Liabilities (Tables) Sheet http://www.mgeenergy.com/role/DisclosureRegulatoryAssetsAndLiabilitiesTables Regulatory Assets and Liabilities (Tables) false false R46.htm 030055 - Disclosure - Noncontrolling Interest (Tables) Sheet http://www.mgeenergy.com/role/NoncontrollingInterestTables Noncontrolling Interest (Tables) false false R47.htm 030060 - Disclosure - Long-Term Debt (Tables) Sheet http://www.mgeenergy.com/role/DisclosureLongTermDebtTables Long-Term Debt (Tables) false false R48.htm 030070 - Disclosure - Notes Payable to Banks, Commercial Paper, and Lines of Credit (Tables) Notes http://www.mgeenergy.com/role/DisclosureNotesPayableToBanksCommercialPaperAndLinesOfCreditTables Notes Payable to Banks, Commercial Paper, and Lines of Credit (Tables) false false R49.htm 030080 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://www.mgeenergy.com/role/DisclosureFairValueOfFinancialInstrumentsTables Fair Value of Financial Instruments (Tables) false false R50.htm 030090 - Disclosure - Income Taxes (Tables) Sheet http://www.mgeenergy.com/role/DisclosureIncomeTaxesTables Income Taxes (Tables) false false R51.htm 030100 - Disclosure - Pension Plans and Other Postretirement Benefits (Tables) Sheet http://www.mgeenergy.com/role/DisclosurePensionPlansAndOtherPostretirementBenefitsTables Pension Plans and Other Postretirement Benefits (Tables) false false R52.htm 030120 - Disclosure - Share-Based Compensation (Tables) Sheet http://www.mgeenergy.com/role/DisclosureShareBasedCompensationTables Share-Based Compensation (Tables) false false R53.htm 030130 - Disclosure - Derivative and Hedging Instruments (Tables) Sheet http://www.mgeenergy.com/role/DisclosureDerivativeAndHedgingInstrumentsTables Derivative and Hedging Instruments (Tables) false false R54.htm 030140 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.mgeenergy.com/role/DisclosureCommitmentsAndContingenciesTables Commitments and Contingencies (Tables) false false R55.htm 030150 - Disclosure - Blount Station (Tables) Sheet http://www.mgeenergy.com/role/DisclosureBlountStationTables Blount Station (Tables) false false R56.htm 030160 - Disclosure - Asset Retirement Obligations (Tables) Sheet http://www.mgeenergy.com/role/DisclosureAssetRetirementObligationsTables Asset Retirement Obligations (Tables) false false R57.htm 030170 - Disclosure - Segment Information (Tables) Sheet http://www.mgeenergy.com/role/DisclosureSegmentInformationTables Segment Information (Tables) false false R58.htm 030180 - Disclosure - Quarterly Summary of Operations (Tables) Sheet http://www.mgeenergy.com/role/DisclosureQuarterlySummaryOfOperationsTables Quarterly Summary of Operations (Tables) false false R59.htm 040000 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://www.mgeenergy.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) false false R60.htm 040010 - Disclosure - Variable Interest Entities (Details) Sheet http://www.mgeenergy.com/role/DisclosureVariableInterestEntitiesDetails Variable Interest Entities (Details) false false R61.htm 040020 - Disclosure - Property, Plant, and Equipment (Details) Sheet http://www.mgeenergy.com/role/DisclosurePropertyPlantAndEquipmentDetails Property, Plant, and Equipment (Details) false false R62.htm 040030 - Disclosure - Investments (Details-1) Sheet http://www.mgeenergy.com/role/DisclosureInvestmentsDetails1 Investments (Details-1) false false R63.htm 040035 - Disclosure - Investments (Details-2) Sheet http://www.mgeenergy.com/role/DisclosureInvestmentsDetails2 Investments (Details-2) false false R64.htm 040040 - Disclosure - Investments (Details-3) Sheet http://www.mgeenergy.com/role/DisclosureInvestmentsDetails3 Investments (Details-3) false false R65.htm 040045 - Disclosure - Joint Plant Ownership (Details) Sheet http://www.mgeenergy.com/role/DisclosureJointPlantOwnershipDetails Joint Plant Ownership (Details) false false R66.htm 040050 - Disclosure - Regulatory Assets and Liabilities (Details) Sheet http://www.mgeenergy.com/role/DisclosureRegulatoryAssetsAndLiabilitiesDetails Regulatory Assets and Liabilities (Details) false false R67.htm 040060 - Disclosure - Common Equity (Details) Sheet http://www.mgeenergy.com/role/DisclosureCommonEquityDetails Common Equity (Details) false false R68.htm 040070 - Disclosure - Noncontrolling Interest (Details) Sheet http://www.mgeenergy.com/role/DisclosureNoncontrollingInterestDetails Noncontrolling Interest (Details) false false R69.htm 040080 - Disclosure - Long-Term Debt (Details) Sheet http://www.mgeenergy.com/role/DisclosureLongTermDebtDetails Long-Term Debt (Details) false false R70.htm 040090 - Disclosure - Notes Payable to Banks, Commercial Paper, and Lines of Credit (Details) Notes http://www.mgeenergy.com/role/DisclosureNotesPayableToBanksCommercialPaperAndLinesOfCreditDetails Notes Payable to Banks, Commercial Paper, and Lines of Credit (Details) false false R71.htm 040100 - Disclosure - Fair Value of Financial Instruments (Details-1) Sheet http://www.mgeenergy.com/role/DisclosureFairValueOfFinancialInstrumentsDetails1 Fair Value of Financial Instruments (Details-1) false false R72.htm 040101 - Disclosure - Fair Value of Financial Instruments (Details-2) Sheet http://www.mgeenergy.com/role/DisclosureFairValueOfFinancialInstrumentsDetails2 Fair Value of Financial Instruments (Details-2) false false R73.htm 040102 - Disclosure - Fair Value of Financial Instruments (Details-3) Sheet http://www.mgeenergy.com/role/DisclosureFairValueOfFinancialInstrumentsDetails3 Fair Value of Financial Instruments (Details-3) false false R74.htm 040110 - Disclosure - Income Taxes (Details) Sheet http://www.mgeenergy.com/role/DisclosureIncomeTaxesDetails Income Taxes (Details) false false R75.htm 040120 - Disclosure - Pension Plans and Other Postretirement Benefits (Details-1) Sheet http://www.mgeenergy.com/role/DisclosurePensionPlansAndOtherPostretirementBenefitsDetails1 Pension Plans and Other Postretirement Benefits (Details-1) false false R76.htm 040121 - Disclosure - Pension Plans and Other Postretirement Benefits (Details-2) Sheet http://www.mgeenergy.com/role/DisclosurePensionPlansAndOtherPostretirementBenefitsDetails2 Pension Plans and Other Postretirement Benefits (Details-2) false false R77.htm 040122 - Disclosure - Pension Plans and Other Postretirement Benefits (Details-3) Sheet http://www.mgeenergy.com/role/DisclosurePensionPlansAndOtherPostretirementBenefitsDetails3 Pension Plans and Other Postretirement Benefits (Details-3) false false R78.htm 040123 - Disclosure - Pension Plans and Other Postretirement Benefits (Details-4) Sheet http://www.mgeenergy.com/role/DisclosurePensionPlansAndOtherPostretirementBenefitsDetails4 Pension Plans and Other Postretirement Benefits (Details-4) false false R79.htm 040124 - Disclosure - Pension Plans and Other Postretirement Benefits (Details-5) Sheet http://www.mgeenergy.com/role/DisclosurePensionPlansAndOtherPostretirementBenefitsDetails5 Pension Plans and Other Postretirement Benefits (Details-5) false false R80.htm 040130 - Disclosure - Share-Based Compensation (Details) Sheet http://www.mgeenergy.com/role/DisclosureShareBasedCompensationDetails Share-Based Compensation (Details) false false R81.htm 040140 - Disclosure - Regional Transmission Organizations (Details) Sheet http://www.mgeenergy.com/role/DisclosureRegionalTransmissionOrganizationsDetails Regional Transmission Organizations (Details) false false R82.htm 040150 - Disclosure - Derivative and Hedging Instruments (Details-1) Sheet http://www.mgeenergy.com/role/DisclosureDerivativeAndHedgingInstrumentsDetails1 Derivative and Hedging Instruments (Details-1) false false R83.htm 040151 - Disclosure - Derivative and Hedging Instruments (Details-2) Sheet http://www.mgeenergy.com/role/DisclosureDerivativeAndHedgingInstrumentsDetails2 Derivative and Hedging Instruments (Details-2) false false R84.htm 040152 - Disclosure - Derivative and Hedging Instruments (Details-3) Sheet http://www.mgeenergy.com/role/DisclosureDerivativeAndHedgingInstrumentsDetails3 Derivative and Hedging Instruments (Details-3) false false R85.htm 040160 - Disclosure - Rate Matters (Details) Sheet http://www.mgeenergy.com/role/DisclosureRateMattersDetails Rate Matters (Details) false false R86.htm 040170 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.mgeenergy.com/role/DisclosureCommitmentsAndContingenciesDetails Commitments and Contingencies (Details) false false R87.htm 040180 - Disclosure - Blount Station (Details) Sheet http://www.mgeenergy.com/role/DisclosureBlountStationDetails Blount Station (Details) false false R88.htm 040190 - Disclosure - Asset Retirement Obligations (Details) Sheet http://www.mgeenergy.com/role/DisclosureAssetRetirementObligationsDetails Asset Retirement Obligations (Details) false false R89.htm 040200 - Disclosure - Elm Road (Details) Sheet http://www.mgeenergy.com/role/DisclosureElmRoadDetails Elm Road (Details) false false R90.htm 040210 - Disclosure - Segment Information (Details) Sheet http://www.mgeenergy.com/role/DisclosureSegmentInformationDetails Segment Information (Details) false false R91.htm 040220 - Disclosure - Quarterly Summary of Operations (Details) Sheet http://www.mgeenergy.com/role/DisclosureQuarterlySummaryOfOperationsDetails Quarterly Summary of Operations (Details) false false R92.htm 040230 - Disclosure - Related Party Transactions (Details) Sheet http://www.mgeenergy.com/role/DisclosureRelatedPartyTransactionsDetails Related Party Transactions (Details) false false R93.htm 040240 - Disclosure - Subsequent Events (Details) Sheet http://www.mgeenergy.com/role/DisclosureSubsequentEventsDetails Subsequent Events (Details) false false R94.htm 040250 - Disclosure - Schedule I - Condensed Parent Company Finanical Statements (Details-Income Statement) Sheet http://www.mgeenergy.com/role/DisclosureScheduleICondensedParentCompanyFinanicalStatementsDetailsIncomeStatement Schedule I - Condensed Parent Company Finanical Statements (Details-Income Statement) false false R95.htm 040260 - Disclosure - Schedule I - Condensed Parent Company Finanical Statements (Details-Cash Flow Statement) Sheet http://www.mgeenergy.com/role/DisclosureScheduleICondensedParentCompanyFinanicalStatementsDetailsCashFlowStatement Schedule I - Condensed Parent Company Finanical Statements (Details-Cash Flow Statement) false false R96.htm 040270 - Disclosure - Schedule I - Condensed Parent Company Finanical Statements (Details-Balance Sheet) Sheet http://www.mgeenergy.com/role/DisclosureScheduleICondensedParentCompanyFinanicalStatementsDetailsBalanceSheet Schedule I - Condensed Parent Company Finanical Statements (Details-Balance Sheet) false false R97.htm 040280 - Disclosure - Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 1) Notes http://www.mgeenergy.com/role/DisclosureScheduleICondensedParentCompanyFinanicalStatementsDetailsNotes1 Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 1) false false R98.htm 040290 - Disclosure - Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 2) Notes http://www.mgeenergy.com/role/DisclosureScheduleICondensedParentCompanyFinanicalStatementsDetailsNotes2 Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 2) false false R99.htm 040300 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Details) Sheet http://www.mgeenergy.com/role/DisclosureScheduleIIValuationAndQualifyingAccountsDetails Schedule II - Valuation and Qualifying Accounts (Details) false false All Reports Book All Reports Element mgee_PensionAndOtherPostretirementDefinedBenefitPlansRegulatoryAsset had a mix of decimals attribute values: -5 -3. Element us-gaap_SecuredLongTermDebt had a mix of decimals attribute values: -5 -3. 'Monetary' elements on report '040010 - Disclosure - Variable Interest Entities (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '040030 - Disclosure - Investments (Details-1)' had a mix of different decimal attribute values. 'Monetary' elements on report '040035 - Disclosure - Investments (Details-2)' had a mix of different decimal attribute values. 'Monetary' elements on report '040045 - Disclosure - Joint Plant Ownership (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '040090 - Disclosure - Notes Payable to Banks, Commercial Paper, and Lines of Credit (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '040101 - Disclosure - Fair Value of Financial Instruments (Details-2)' had a mix of different decimal attribute values. 'Monetary' elements on report '040110 - Disclosure - Income Taxes (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '040120 - Disclosure - Pension Plans and Other Postretirement Benefits (Details-1)' had a mix of different decimal attribute values. 'Monetary' elements on report '040123 - Disclosure - Pension Plans and Other Postretirement Benefits (Details-4)' had a mix of different decimal attribute values. 'Monetary' elements on report '040124 - Disclosure - Pension Plans and Other Postretirement Benefits (Details-5)' had a mix of different decimal attribute values. 'Monetary' elements on report '040150 - Disclosure - Derivative and Hedging Instruments (Details-1)' had a mix of different decimal attribute values. 'Monetary' elements on report '040152 - Disclosure - Derivative and Hedging Instruments (Details-3)' had a mix of different decimal attribute values. 'Monetary' elements on report '040170 - Disclosure - Commitments and Contingencies (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '040180 - Disclosure - Blount Station (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '040190 - Disclosure - Asset Retirement Obligations (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '040280 - Disclosure - Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 1)' had a mix of different decimal attribute values. 'Monetary' elements on report '040290 - Disclosure - Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 2)' had a mix of different decimal attribute values. Process Flow-Through: 010020 - Statement - MGE Energy Inc Consolidated Statements of Income Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2010' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2010' Process Flow-Through: 010025 - Statement - Madison Gas and Electric Company Consolidated Statements of Income Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2010' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2010' Process Flow-Through: 010030 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: Removing column 'Dec. 31, 2008' Process Flow-Through: 010040 - Statement - Consolidated Balance Sheets (Parentheticals) Process Flow-Through: 010050 - Statement - MGE Energy Inc Consolidated Statements of Cash Flows Process Flow-Through: 010055 - Statement - Madison Gas and Electric Company Consolidated Statements of Cash Flows Process Flow-Through: 010070 - Statement - Consolidated Statements of Common Equity (Parentheticals) Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2010' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2010' mgee-20111231.xml mgee-20111231.xsd mgee-20111231_cal.xml mgee-20111231_def.xml mgee-20111231_lab.xml mgee-20111231_pre.xml true true