$MGEE
MGE ENERGY INC Stock $mgee

$mgee Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-K Financial Statement

#000116172813000001 Filed on February 26, 2013

Income Statement

Concept	2012 Q4	2012 Q2	2012
Revenue	$137.0M	$117.2M	$541.3M
YoY Change	4.63%	-0.03%	-0.93%
Cost Of Revenue	$47.00M	$25.10M	$152.0M
YoY Change	13.53%	-8.39%	-7.09%
Gross Profit	$90.00M	$92.10M	$389.3M
YoY Change	0.56%	2.45%	1.7%
Gross Profit Margin	65.69%	78.57%	71.92%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$9.700M	$9.700M	$38.70M
YoY Change	-4.9%	-6.73%	-5.38%
% of Gross Profit	10.78%	10.53%	9.94%
Operating Expenses	$70.70M	$67.00M	$276.6M
YoY Change	-1.94%	0.45%	0.62%
Operating Profit	$19.35M	$25.08M	$112.8M
YoY Change	10.96%	8.12%	4.54%
Interest Expense	-$4.800M	$4.764M	$19.47M
YoY Change	-5.88%	-5.76%	-3.45%
% of Operating Profit	-24.81%	18.99%	17.26%
Other Income/Expense, Net	$2.100M	$2.549M	$10.07M
YoY Change	-8.7%	18.39%	9.28%
Pretax Income	$16.70M	$22.87M	$103.4M
YoY Change	13.61%	12.67%	6.65%
Income Tax	$6.208M	$8.596M	$38.92M
% Of Pretax Income	37.17%	37.59%	37.65%
Net Earnings	$10.49M	$14.27M	$64.45M
YoY Change	11.74%	12.16%	5.77%
Net Earnings / Revenue	7.65%	12.17%	11.91%
Basic Earnings Per Share	$0.46	$0.62	$2.79
Diluted Earnings Per Share	$302.6K	$412.1K	$1.856M
COMMON SHARES
Basic Shares Outstanding	23.11M shares	23.11M shares	23.11M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2012 Q4	2012 Q2	2012
SHORT-TERM ASSETS
Cash & Short-Term Investments	$46.40M	$41.30M	$46.40M
YoY Change	12.62%	28.66%	12.62%
Cash & Equivalents	$46.36M	$41.29M	$46.40M
Short-Term Investments
Other Short-Term Assets	$8.512M	$7.056M	$90.10M
YoY Change	2.93%	-84.92%	36.31%
Inventory	$38.30M	$38.50M	$38.30M
Prepaid Expenses
Receivables	$41.39M	$30.55M	$41.40M
Other Receivables	$6.746M	$5.381M	$6.700M
Total Short-Term Assets	$222.9M	$178.7M	$222.9M
YoY Change	17.87%	13.24%	17.87%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.073B	$969.7M	$1.074B
YoY Change	11.64%	-0.96%	7.82%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$61.06M	$62.30M	$64.60M
YoY Change	7.13%	11.65%	7.13%
Other Assets	$5.973M	$6.830M	$224.8M
YoY Change	-8.45%	-94.91%	5.84%
Total Long-Term Assets	$1.364B	$1.328B	$1.364B
YoY Change	7.42%	13.24%	7.42%
TOTAL ASSETS
Total Short-Term Assets	$222.9M	$178.7M	$222.9M
Total Long-Term Assets	$1.364B	$1.328B	$1.364B
Total Assets	$1.587B	$1.507B	$1.587B
YoY Change	8.78%	13.24%	8.77%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$43.52M	$28.24M	$43.50M
YoY Change	26.02%	9.88%	26.09%
Accrued Expenses	$14.40M	$11.90M	$14.40M
YoY Change	2.13%	-4.8%	2.13%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$3.013M	$2.667M	$3.000M
YoY Change	12.97%	-1.22%	11.11%
Total Short-Term Liabilities	$75.80M	$62.12M	$75.80M
YoY Change	20.17%	18.78%	20.13%
LONG-TERM LIABILITIES
Long-Term Debt	$358.5M	$360.2M	$358.5M
YoY Change	-0.67%	-0.56%	-0.67%
Other Long-Term Liabilities	$50.58M	$46.08M	$302.8M
YoY Change	17.11%	-77.12%	6.58%
Total Long-Term Liabilities	$573.2M	$520.6M	$661.3M
YoY Change	18.44%	-7.62%	2.53%
TOTAL LIABILITIES
Total Short-Term Liabilities	$75.80M	$62.12M	$75.80M
Total Long-Term Liabilities	$573.2M	$520.6M	$661.3M
Total Liabilities	$649.0M	$582.8M	$1.008B
YoY Change	18.64%	-26.43%	10.97%
SHAREHOLDERS EQUITY
Retained Earnings	$228.4M
YoY Change	8.01%
Common Stock	$34.67M
YoY Change	49.99%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares	0.000 shares
Shareholders Equity	$579.4M	$563.6M	$579.4M
YoY Change
Total Liabilities & Shareholders Equity	$1.587B	$1.507B	$1.587B
YoY Change	8.78%	13.24%	8.77%

Cashflow Statement

Concept	2012 Q4	2012 Q2	2012
OPERATING ACTIVITIES
Net Income	$10.49M	$14.27M	$64.45M
YoY Change	11.74%	12.16%	5.77%
Depreciation, Depletion And Amortization	$9.700M	$9.700M	$38.70M
YoY Change	-4.9%	-6.73%	-5.38%
Cash From Operating Activities	$30.10M	$36.10M	$146.0M
YoY Change	23.87%	22.79%	11.65%
INVESTING ACTIVITIES
Capital Expenditures	-$32.50M	-$24.10M	$98.44M
YoY Change	60.1%	28.19%	51.03%
Acquisitions
YoY Change
Other Investing Activities	-$600.0K	-$1.100M	$496.0K
YoY Change	-133.33%		-124.99%
Cash From Investing Activities	-$33.20M	-$25.10M	-$101.4M
YoY Change	79.46%	34.22%	52.75%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net			$30.67M
YoY Change			1126.72%
Cash From Financing Activities	-9.800M	-10.30M	-$39.46M
YoY Change	3.16%	10.75%	29.97%
NET CHANGE
Cash From Operating Activities	30.10M	36.10M	$146.0M
Cash From Investing Activities	-33.20M	-25.10M	-$101.4M
Cash From Financing Activities	-9.800M	-10.30M	-$39.46M
Net Change In Cash	-12.90M	700.0K	$5.188M
YoY Change	248.65%	-50.0%	-84.77%
FREE CASH FLOW
Cash From Operating Activities	$30.10M	$36.10M	$146.0M
Capital Expenditures	-$32.50M	-$24.10M	$98.44M
Free Cash Flow	$62.60M	$60.20M	$47.57M
YoY Change	40.36%	24.9%	-27.48%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	392365000	USD
CY2012	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	139727000	USD
CY2012	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	9231000	USD
CY2012	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	541323000	USD
CY2012	mgee	Utilities Operating Expense Fuel For Electric Generation UtilitiesOperatingExpenseFuelForElectricGeneration	46499000	USD
CY2012	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	73842000	USD
CY2012	mgee	Utilities Operating Expense Cost Of Gas Sold UtilitiesOperatingExpenseCostOfGasSold	78156000	USD
CY2012	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	172996000	USD
CY2012	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	38707000	USD
CY2012	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	428560000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	112763000	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	10069000	USD
CY2012	us-gaap	Interest Expense InterestExpense	19467000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	103365000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38919000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	64446000	USD
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	23114000	shares
CY2012	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.56
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.79
CY2011	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	165271000	USD
CY2011	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	546382000	USD
CY2011	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	5253000	USD
CY2011	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	375858000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35992000	USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.64
CY2011	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	165859000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	107868000	USD
CY2011	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	64085000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	9214000	USD
CY2011	mgee	Utilities Operating Expense Cost Of Gas Sold UtilitiesOperatingExpenseCostOfGasSold	99465000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	96920000	USD
CY2011	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	438514000	USD
CY2011	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.52
CY2011	us-gaap	Interest Expense InterestExpense	20162000	USD
CY2011	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	40942000	USD
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	23114000	shares
CY2011	mgee	Utilities Operating Expense Fuel For Electric Generation UtilitiesOperatingExpenseFuelForElectricGeneration	50819000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	60928000	USD
CY2010	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	360729000	USD
CY2010	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	532591000	USD
CY2010	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	5947000	USD
CY2010	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	165915000	USD
CY2010	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	71239000	USD
CY2010	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	435989000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	96602000	USD
CY2010	mgee	Utilities Operating Expense Cost Of Gas Sold UtilitiesOperatingExpenseCostOfGasSold	103784000	USD
CY2010	mgee	Utilities Operating Expense Fuel For Electric Generation UtilitiesOperatingExpenseFuelForElectricGeneration	41947000	USD
CY2010	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	37960000	USD
CY2010	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	164001000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	91538000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	33820000	USD
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.50
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	23114000	shares
CY2010	us-gaap	Interest Expense InterestExpense	16157000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	57718000	USD
CY2010	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.49
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	11093000	USD
CY2012	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	18360000	USD
CY2010	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	17058000	USD
CY2011	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	17344000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-15000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	15000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	60898000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-18000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	64428000	USD
CY2012	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	0	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	57655000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-63000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-42000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-10000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	10000	USD
CY2012	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-12000	USD
CY2012	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-44797000	USD
CY2012	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2498000	USD
CY2012	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	18353000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	9079000	USD
CY2012	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1484000	USD
CY2012	us-gaap	Increase Decrease In Margin Deposits Outstanding IncreaseDecreaseInMarginDepositsOutstanding	-3726000	USD
CY2012	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	6208000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1457000	USD
CY2012	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	2508000	USD
CY2012	us-gaap	Interest Paid InterestPaid	19499000	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	3544000	USD
CY2012	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	12536000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-336000	USD
CY2011	us-gaap	Increase Decrease In Prepaid Taxes IncreaseDecreaseInPrepaidTaxes	-245000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	35026000	USD
CY2011	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	4370000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	130772000	USD
CY2011	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	-3466000	USD
CY2012	us-gaap	Increase Decrease In Prepaid Taxes IncreaseDecreaseInPrepaidTaxes	-2731000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-367000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-272000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	425000	USD
CY2012	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	7146000	USD
CY2012	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	28857000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	146004000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	98435000	USD
CY2012	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	2419000	USD
CY2012	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	201000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	697000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-101353000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	35951000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	30668000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	28000000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-844000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-39463000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	5188000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	41169000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	46357000	USD
CY2011	us-gaap	Increase Decrease In Margin Deposits Outstanding IncreaseDecreaseInMarginDepositsOutstanding	2609000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-7438000	USD
CY2011	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-173000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-538000	USD
CY2011	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-33698000	USD
CY2011	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	112000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-30362000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	65176000	USD
CY2011	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	23670000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2500000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-66351000	USD
CY2011	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2312000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	5537000	USD
CY2011	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1728000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	7110000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	2055000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-22500000	USD
CY2011	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	1008000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-4300000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	30000000	USD
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	6728000	USD
CY2010	mgee	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Regulatory Assets Liabilities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInRegulatoryAssetsLiabilities	-6169000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	-1348000	USD
CY2010	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	810000	USD
CY2010	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-92000000	USD
CY2010	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	14748000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	977000	USD
CY2010	us-gaap	Income Taxes Paid IncomeTaxesPaid	10373000	USD
CY2010	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	6667000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-4195000	USD
CY2010	us-gaap	Increase Decrease In Margin Deposits Outstanding IncreaseDecreaseInMarginDepositsOutstanding	-1159000	USD
CY2010	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	16901000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	8501000	USD
CY2011	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	13703000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1873000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	34059000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	8615000	USD
CY2011	us-gaap	Interest Paid InterestPaid	19788000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-2895000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	124033000	USD
CY2010	us-gaap	Interest Paid InterestPaid	18643000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	2406000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-149000	USD
CY2010	us-gaap	Increase Decrease In Prepaid Taxes IncreaseDecreaseInPrepaidTaxes	-7540000	USD
CY2010	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-25381000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1345000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-64242000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-57385000	USD
CY2010	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-2254000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-3755000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	60082000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	34370000	USD
CY2010	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2805000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	80000000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	16527000	USD
CY2010	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	8191000	USD
CY2010	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3358000	USD
CY2010	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	9043000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4704000	USD
CY2010	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	41000	USD
CY2012	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	3000	USD
CY2011	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	2152000	USD
CY2010	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	0	USD
CY2010	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	3153000	USD
CY2011	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	112000	USD
CY2012	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	201000	USD
CY2012	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	-6992000	USD
CY2011	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	3876000	USD
CY2010	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	-8900000	USD
CY2010	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	762000	USD
CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	684000	USD
CY2012	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	10317000	USD
CY2012Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	1818000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	341000	USD
CY2011	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInvestmentIncome	0	USD
CY2011Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	2477000	USD
CY2012Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	3013000	USD
CY2011Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	2667000	USD
CY2011Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	34055000	USD
CY2012Q4	mgee	Total Property Plant And Equipment TotalPropertyPlantAndEquipment	1073464000	USD
CY2011Q4	mgee	Total Property Plant And Equipment TotalPropertyPlantAndEquipment	995566000	USD
CY2012Q4	us-gaap	Investments Investments	64595000	USD
CY2011Q4	us-gaap	Investments Investments	60332000	USD
CY2012Q4	us-gaap	Assets Assets	1586924000	USD
CY2011Q4	us-gaap	Assets Assets	1458882000	USD
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	43518000	USD
CY2012Q4	mgee	Unbilled Revenues UnbilledRevenues	28262000	USD
CY2011Q4	mgee	Unbilled Revenues UnbilledRevenues	25754000	USD
CY2012Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	16997000	USD
CY2011Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	14758000	USD
CY2012Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	6367000	USD
CY2011Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	5468000	USD
CY2012Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	14980000	USD
CY2011Q4	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	19575000	USD
CY2012Q4	us-gaap	Prepaid Taxes PrepaidTaxes	19520000	USD
CY2011Q4	us-gaap	Prepaid Taxes PrepaidTaxes	22251000	USD
CY2012Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	10327000	USD
CY2011Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	7347000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	6694000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	8270000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	222937000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	189131000	USD
CY2012Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	218853000	USD
CY2011Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	205835000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	5973000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	6524000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	975053000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	961511000	USD
CY2012Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	98411000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	34532000	USD
CY2012Q4	mgee	Accrued Interest And Taxes AccruedInterestAndTaxes	4296000	USD
CY2011Q4	mgee	Accrued Interest And Taxes AccruedInterestAndTaxes	4085000	USD
CY2012Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	10063000	USD
CY2011Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	9987000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	0	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	3020000	USD
CY2012Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	5637000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1300000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	75797000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	63074000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	270410000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	199850000	USD
CY2012Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	1520000	USD
CY2011Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	1780000	USD
CY2012Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	24538000	USD
CY2011Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	20463000	USD
CY2012Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	162835000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	183622000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	50584000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	43192000	USD
CY2012Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	573207000	USD
CY2011Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	483953000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	316268000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	316268000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	239953000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	211458000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	94000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	112000	USD
CY2012Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	358491000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	360903000	USD
CY2012Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	937920000	USD
CY2011Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	911855000	USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1586924000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1458882000	USD
CY2012Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	1102000	USD
CY2011Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	1494000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3885000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Premiums And Other Receivables AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	931000	USD
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3662000	USD
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Premiums And Other Receivables AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	439000	USD
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	23114000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	23114000	shares
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	579429000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	550952000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	23114000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	23114000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	41386000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	36744000	USD
CY2011Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	5318000	USD
CY2012Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	6746000	USD
CY2012Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	9270000	USD
CY2011Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	7483000	USD
CY2011Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	35046000	USD
CY2012Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	63320000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	23483000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	0	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	501795000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	525080000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	35951000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	35026000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	34370000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-18000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-63000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-30000	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	MGE Energy Inc
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001161728
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q4	dei	Entity Public Float EntityPublicFloat	1090221546	USD
CY2012Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	23113638	shares
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:27px;">c.       Use of Estimates - MGE Energy and MGE.</font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:45px;">In order to prepare consolidated financial statements in conformity with </font><font style="font-family:Times New Roman;font-size:10pt;">GAAP</font><font style="font-family:Times New Roman;font-size:10pt;">, management must make estimates and assumptions. These estimates could affect reported amounts of a</font><font style="font-family:Times New Roman;font-size:10pt;">ssets, liabilities, and</font><font style="font-family:Times New Roman;font-size:10pt;"> disclosure</font><font style="font-family:Times New Roman;font-size:10pt;">s</font><font style="font-family:Times New Roman;font-size:10pt;"> at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from management's estimates.</font></p>
CY2012	mgee	Electric License Fee Tax Rate Resale ElectricLicenseFeeTaxRateResale	0.0159	pure
CY2012Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	0	USD
CY2011Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	3000000	USD
CY2012Q4	mgee	Unpaid Receivables Late Payment Charge UnpaidReceivablesLatePaymentCharge	0.01	pure
CY2012Q4	mgee	Emission Allowance Balances EmissionAllowanceBalances	100000	USD
CY2011Q4	mgee	Emission Allowance Balances EmissionAllowanceBalances	200000	USD
CY2011Q4	mgee	Renewable Energy Credit Allowance Balances RenewableEnergyCreditAllowanceBalances	300000	USD
CY2012Q4	mgee	Renewable Energy Credit Allowance Balances RenewableEnergyCreditAllowanceBalances	500000	USD
CY2012Q4	mgee	Purchased Gas Adjustment Over Collected PurchasedGasAdjustmentOverCollected	-100000	USD
CY2011Q4	mgee	Purchased Gas Adjustment Over Collected PurchasedGasAdjustmentOverCollected	900000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.50	pure
CY2012	mgee	Public Utilities Allowance For Funds Used During Construction Capitalization Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizationRate	0.0836	pure
CY2012	mgee	Public Utilities Allowance For Funds Used During Construction Rate Columbia Environmental Costs PublicUtilitiesAllowanceForFundsUsedDuringConstructionRateColumbiaEnvironmentalCosts	1.00	pure
CY2012Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	14500000	USD
CY2011Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	14500000	USD
CY2011	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	1800000	USD
CY2012	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	1300000	USD
CY2012	mgee	Electric License Fee Tax Rate Retail Sales ElectricLicenseFeeTaxRateRetailSales	0.0319	pure
CY2012	mgee	Natural Gas License Fee Tax NaturalGasLicenseFeeTax	0.0097	pure
CY2012	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	13500000	USD
CY2011	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	12900000	USD
CY2010	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	12600000	USD
CY2012Q4	mgee	Electric Territory ElectricTerritory	316	SqMi
CY2012Q4	mgee	Gas Territory GasTerritory	1631	SqMi
CY2011	mgee	Public Utilities Allowance For Funds Used During Construction Capitalization Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizationRate	0.0836	pure
CY2010	mgee	Public Utilities Allowance For Funds Used During Construction Capitalization Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizationRate	0.0836	pure
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.50	pure
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.50	pure
CY2011	mgee	Public Utilities Allowance For Funds Used During Construction Rate Columbia Environmental Costs PublicUtilitiesAllowanceForFundsUsedDuringConstructionRateColumbiaEnvironmentalCosts	1.00	pure
CY2010	mgee	Public Utilities Allowance For Funds Used During Construction Rate Columbia Environmental Costs PublicUtilitiesAllowanceForFundsUsedDuringConstructionRateColumbiaEnvironmentalCosts	1.00	pure
CY2012Q4	mgee	Impairment Of Long Lived Assets ImpairmentOfLongLivedAssets	0	USD
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	0	shares
CY2012Q4	mgee	Other Variable Interest Entity Purchase Power Agreement OtherVariableInterestEntityPurchasePowerAgreement	65	MW
CY2011Q4	mgee	Other Variable Interest Entity Purchase Power Agreement OtherVariableInterestEntityPurchasePowerAgreement	50	MW
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1575000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1347000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	161000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	196000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	3000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	9000	USD
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	1733000	USD
CY2011Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	1534000	USD
CY2012Q4	us-gaap	Equity Method Investments EquityMethodInvestments	61058000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	56996000	USD
CY2012Q4	us-gaap	Other Investments OtherInvestments	1804000	USD
CY2011Q4	us-gaap	Other Investments OtherInvestments	1802000	USD
CY2012	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2012	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	USD
CY2011	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	198000	USD
CY2011	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	260000	USD
CY2010	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	161000	USD
CY2010	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	43000	USD
CY2012Q4	us-gaap	Medium Term Notes MediumTermNotes	120000000	USD
CY2011Q4	us-gaap	Medium Term Notes MediumTermNotes	120000000	USD
CY2011Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	20463000	USD
CY2012Q4	us-gaap	Regulatory Assets RegulatoryAssets	229180000	USD
CY2011Q4	us-gaap	Regulatory Assets RegulatoryAssets	213182000	USD
CY2012Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	24538000	USD
CY2011Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1175000	shares
CY2011Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	25
CY2011Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2011Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	0	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2012Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2011Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	903000	USD
CY2012Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	301000	USD
CY2012Q4	mgee	Tax Exempt Debt TaxExemptDebt	19300000	USD
CY2011Q4	us-gaap	Secured Long Term Debt SecuredLongTermDebt	195973000	USD
CY2012Q4	us-gaap	Secured Long Term Debt SecuredLongTermDebt	221305000	USD
CY2011Q4	mgee	Tax Exempt Debt TaxExemptDebt	47300000	USD
CY2012Q4	mgee	First Mortgage Bonds FirstMortgageBonds	1200000	USD
CY2011Q4	mgee	First Mortgage Bonds FirstMortgageBonds	1200000	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	361805000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	4267000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	54357000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	291884000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	3013000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	4102000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	4182000	USD
CY2012	us-gaap	Debt Conversion Original Debt Interest Rate Of Debt DebtConversionOriginalDebtInterestRateOfDebt	0.04875	pure
CY2012	us-gaap	Debt Conversion Converted Instrument Rate DebtConversionConvertedInstrumentRate	0.0345	pure
CY2012Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	0	USD
CY2012	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	16000000	USD
CY2012	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	1154000	USD
CY2011Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	0	USD
CY2011	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	28500000	USD
CY2011	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	3410000	USD
CY2010Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	22500000	USD
CY2010	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	58080000	USD
CY2010	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	122500000	USD
CY2012Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0000	pure
CY2012	mgee	Short Term Debt Weighted Average Interest Rate During Period ShortTermDebtWeightedAverageInterestRateDuringPeriod	0.0017	pure
CY2011Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0000	pure
CY2011	mgee	Short Term Debt Weighted Average Interest Rate During Period ShortTermDebtWeightedAverageInterestRateDuringPeriod	0.0143	pure
CY2010	mgee	Short Term Debt Weighted Average Interest Rate During Period ShortTermDebtWeightedAverageInterestRateDuringPeriod	0.0056	pure
CY2010Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0136	pure
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues	0	USD
CY2012Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	320000	USD
CY2012Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	320000	USD
CY2012Q4	us-gaap	Derivative Financial Instruments Liabilities Fair Value Disclosure DerivativeFinancialInstrumentsLiabilitiesFairValueDisclosure	72329000	USD
CY2012Q4	mgee	Deferred Compensation Fair Value Disclosure DeferredCompensationFairValueDisclosure	2010000	USD
CY2012Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	74339000	USD
CY2011Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	350000	USD
CY2011Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	350000	USD
CY2011Q4	us-gaap	Derivative Financial Instruments Liabilities Fair Value Disclosure DerivativeFinancialInstrumentsLiabilitiesFairValueDisclosure	42356000	USD
CY2011Q4	mgee	Deferred Compensation Fair Value Disclosure DeferredCompensationFairValueDisclosure	1725000	USD
CY2011Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	44081000	USD
CY2012	mgee	Deferred Compensation Interest Calculation Increase Compounded Monthly DeferredCompensationInterestCalculationIncreaseCompoundedMonthly	0.01	pure
CY2012	mgee	Deferred Compensation Interest Calculation Minimum Annual Rate DeferredCompensationInterestCalculationMinimumAnnualRate	0.07	pure
CY2012	mgee	Deferred Compensation Interest Calculation Treasury Bills Maturity DeferredCompensationInterestCalculationTreasuryBillsMaturity	26	pure
CY2012	mgee	Fair Value Inputs Delivery Points Basis Adjustment On Peak FairValueInputsDeliveryPointsBasisAdjustmentOnPeak	0.968	pure
CY2012	mgee	Fair Value Inputs Delivery Points Basis Adjustment Off Peak FairValueInputsDeliveryPointsBasisAdjustmentOffPeak	0.948	pure
CY2012	mgee	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Regulatory Assets Liabilities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInRegulatoryAssetsLiabilities	-31685000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome	0	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings	-5005000	USD
CY2012	mgee	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Current Assets FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInCurrentAssets	0	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	13370000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-92000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues	0	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	8457000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	0	USD
CY2012	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInvestmentIncome	0	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	1353000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings	868000	USD
CY2011	mgee	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Current Assets FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInCurrentAssets	0	USD
CY2011	mgee	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Regulatory Assets Liabilities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInRegulatoryAssetsLiabilities	-21445000	USD
CY2010	us-gaap	Investment Tax Credit InvestmentTaxCredit	-312000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	0	USD
CY2010	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInvestmentIncome	0	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	0	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	-40661000	USD
CY2010Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	-19216000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues	0	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-144000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings	-1482000	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-134000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	20811000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome	0	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	0	USD
CY2010	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncome	0	USD
CY2010	mgee	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Current Assets FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInCurrentAssets	0	USD
CY2009Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	-13047000	USD
CY2012Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	-72346000	USD
CY2012	us-gaap	Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings	-5005000	USD
CY2011	us-gaap	Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings	868000	USD
CY2010	us-gaap	Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings	-1482000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-6053000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	436000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	37178000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	7618000	USD
CY2012	us-gaap	Investment Tax Credit InvestmentTaxCredit	-260000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	30115000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3102000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4580000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1504000	USD
CY2011	us-gaap	Investment Tax Credit InvestmentTaxCredit	-301000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2603000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	6148000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4570000	USD
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.050	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.003	pure
CY2012	mgee	Effective Income Tax Rate Reconciliation Tax Credits Wind Energy EffectiveIncomeTaxRateReconciliationTaxCreditsWindEnergy	-0.016	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.003	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003	pure
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.377	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.051	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.003	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.002	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	-0.007	pure
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	10662000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	408436000	USD
CY2012Q4	mgee	Deferred Tax Assets Accrued Expenses DeferredTaxAssetsAccruedExpenses	30277000	USD
CY2012Q4	mgee	Deferred Tax Assetstaxdeferredexpense Compensation And Benefits Pensions And Postretirement Benefits DeferredTaxAssetstaxdeferredexpenseCompensationAndBenefitsPensionsAndPostretirementBenefits	69941000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	1551000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	29134000	USD
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.371	pure
CY2011	mgee	Effective Income Tax Rate Reconciliation Tax Credits Wind Energy EffectiveIncomeTaxRateReconciliationTaxCreditsWindEnergy	-0.018	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.007	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	-0.004	pure
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.370	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	-0.003	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.051	pure
CY2010	mgee	Effective Income Tax Rate Reconciliation Tax Credits Wind Energy EffectiveIncomeTaxRateReconciliationTaxCreditsWindEnergy	-0.017	pure
CY2012	mgee	Effective Income Tax Rate Reconciliation Deductions Afudc Equity Net EffectiveIncomeTaxRateReconciliationDeductionsAfudcEquityNet	-0.004	pure
CY2011	mgee	Effective Income Tax Rate Reconciliation Deductions Afudc Equity Net EffectiveIncomeTaxRateReconciliationDeductionsAfudcEquityNet	0.000	pure
CY2010	mgee	Effective Income Tax Rate Reconciliation Deductions Afudc Equity Net EffectiveIncomeTaxRateReconciliationDeductionsAfudcEquityNet	0.000	pure
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	248545000	USD
CY2012Q4	mgee	Deferred Tax Liabilities Equity Method Investments DeferredTaxLiabilitiesEquityMethodInvestments	29147000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	1643000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Prepaid Pension Costs DeferredTaxLiabilitiesPrepaidPensionCosts	82072000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	29134000	USD
CY2012Q4	mgee	Deferred Tax Liabilities Deductible Prepayments DeferredTaxLiabilitiesDeductiblePrepayments	7233000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5345000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	161874000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	365000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	161509000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-246927000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-202870000	USD
CY2011Q4	mgee	Deferred Tax Liabilities Equity Method Investments DeferredTaxLiabilitiesEquityMethodInvestments	26896000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Prepaid Pension Costs DeferredTaxLiabilitiesPrepaidPensionCosts	68352000	USD
CY2011Q4	mgee	Deferred Tax Assetstaxdeferredexpense Compensation And Benefits Pensions And Postretirement Benefits DeferredTaxAssetstaxdeferredexpenseCompensationAndBenefitsPensionsAndPostretirementBenefits	69646000	USD
CY2011Q4	mgee	Deferred Tax Assets Accrued Expenses DeferredTaxAssetsAccruedExpenses	28458000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	1746000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	16498000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	188235000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	16498000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	118847000	USD
CY2011Q4	mgee	Deferred Tax Liabilities Deductible Prepayments DeferredTaxLiabilitiesDeductiblePrepayments	7276000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	321717000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	365000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2782000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	119212000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	1828000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	12714000	USD
CY2012Q4	mgee	Deferred Tax Assets Future Federal Tax Benefits DeferredTaxAssetsFutureFederalTaxBenefits	25626000	USD
CY2011Q4	mgee	Deferred Tax Assets Future Federal Tax Benefits DeferredTaxAssetsFutureFederalTaxBenefits	0	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	176000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3204000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	214000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	21000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	216000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	98000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2364000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4377000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	314000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	2000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	193000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	401000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	580000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	427000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	128000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3815000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	386000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	141000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2568000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2012	us-gaap	Open Tax Years By Major Tax Jurisdiction OpenTaxYearsByMajorTaxJurisdiction	MGE Energy and consolidated subsidiaries in federal return - 2007 through 2012, MGE Energy Wisconsin separate corporation return - 2007 through 2008, MGE Wisconsin separate corporation return - 2007 through 2008, MGE Energy Wisconsin combined reporting corporation return - 2009 through 2012
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	7500000	USD
CY2012Q4	mgee	Unrecognized Tax Benefits Current Period Tax Positions Permanent Differences UnrecognizedTaxBenefitsCurrentPeriodTaxPositionsPermanentDifferences	0	USD
CY2011Q4	mgee	Unrecognized Tax Benefits Current Period Tax Positions Permanent Differences UnrecognizedTaxBenefitsCurrentPeriodTaxPositionsPermanentDifferences	200000	USD
CY2012Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	63400000	USD
CY2012	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecurities	0.63	pure
CY2012	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Debt Securities DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecurities	0.30	pure
CY2012	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Real Estate DefinedBenefitPlanTargetAllocationPercentageOfAssetsRealEstate	0.07	pure
CY2012	mgee	Defined Benefit Plan Target Allocation Percentage Of Assets Total DefinedBenefitPlanTargetAllocationPercentageOfAssetsTotal	1.00	pure
CY2012Q4	us-gaap	Defined Benefit Plan Equity Securities DefinedBenefitPlanEquitySecurities	0.64	pure
CY2012Q4	us-gaap	Defined Benefit Plan Debt Securities DefinedBenefitPlanDebtSecurities	0.29	pure
CY2012Q4	us-gaap	Defined Benefit Plan Real Estate DefinedBenefitPlanRealEstate	0.07	pure
CY2012Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.00	pure
CY2011Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.00	pure
CY2011Q4	us-gaap	Defined Benefit Plan Debt Securities DefinedBenefitPlanDebtSecurities	0.28	pure
CY2011	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.050	pure
CY2011	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed For Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear	0.080	pure
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	22200000	USD
CY2012Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	3400000	USD
CY2012Q4	us-gaap	Tax Credit Carryforward Deferred Tax Asset TaxCreditCarryforwardDeferredTaxAsset	3400000	USD
CY2012	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed For Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear	0.075	pure
CY2012	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.050	pure
CY2012Q4	us-gaap	Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearThatRateReachesUltimateTrendRate	2018
CY2011Q4	us-gaap	Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearThatRateReachesUltimateTrendRate	2018
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	15591000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation	-12570000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Equity Securities DefinedBenefitPlanEquitySecurities	0.64	pure
CY2011Q4	us-gaap	Defined Benefit Plan Real Estate DefinedBenefitPlanRealEstate	0.08	pure
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	1261000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents	-1003000	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1800000	USD
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2100000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1600000	USD
CY2012Q4	mgee	Medicare Subsidy Due MedicareSubsidyDue	200000	USD
CY2012	mgee	Defined Benefit Plan Target Allocation Percentage Of Assets Domestic Equity Securities DefinedBenefitPlanTargetAllocationPercentageOfAssetsDomesticEquitySecurities	0.455	pure
CY2012	mgee	Defined Benefit Plan Target Allocation Percentage Of Assets Foreign Equity Securities DefinedBenefitPlanTargetAllocationPercentageOfAssetsForeignEquitySecurities	0.175	pure
CY2012Q4	mgee	Pension Concentration Risk Percentage PensionConcentrationRiskPercentage	0.1	pure
CY2012Q4	mgee	Pension And Other Postretirement Defined Benefit Plans Regulatory Asset PensionAndOtherPostretirementDefinedBenefitPlansRegulatoryAsset	134800000	USD
CY2011Q4	mgee	Pension And Other Postretirement Defined Benefit Plans Regulatory Asset PensionAndOtherPostretirementDefinedBenefitPlansRegulatoryAsset	148500000	USD
CY2011	mgee	Deferred Pension And Oprb Costs Recovered DeferredPensionAndOprbCostsRecovered	2600000	USD
CY2012	mgee	Deferred Pension And Oprb Costs Recovered DeferredPensionAndOprbCostsRecovered	1200000	USD
CY2012	us-gaap	Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year Description DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearDescription	$32 million
CY2012	us-gaap	Defined Benefit Plan Estimated Future Benefit Payments Description DefinedBenefitPlanEstimatedFutureBenefitPaymentsDescription	$11 million to $13 million each year
CY2012Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	900000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	900000	USD
CY2013Q1	mgee	Defined Benefit Plan Future Employer Contributions In Next Fiscal Year Already Made DefinedBenefitPlanFutureEmployerContributionsInNextFiscalYearAlreadyMade	30000000	USD
CY2012	mgee	Share Based Compensation Units Granted ShareBasedCompensationUnitsGranted	<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 15px"><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td><td style="width: 181px; text-align:left;border-color:#000000;min-width:181px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; text-align:center;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">MGE Energy</font></td><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td></tr><tr style="height: 15px"><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td><td style="width: 181px; text-align:left;border-color:#000000;min-width:181px;"><font style="TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Grant Date</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">Units Granted</font></td><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td></tr><tr style="height: 15px"><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td><td style="width: 181px; text-align:left;border-color:#000000;min-width:181px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">January 16, 2009</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">18,604</font></td><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td></tr><tr style="height: 15px"><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td><td style="width: 181px; text-align:left;border-color:#000000;min-width:181px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">January 15, 2010</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">17,310</font></td><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td></tr><tr style="height: 15px"><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td><td style="width: 181px; text-align:left;border-color:#000000;min-width:181px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">January 21, 2011</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">15,655</font></td><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td></tr><tr style="height: 15px"><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td><td style="width: 181px; text-align:left;border-color:#000000;min-width:181px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">February 17, 2012</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">16,693</font></td><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td></tr><tr style="height: 15px"><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td><td style="width: 181px; text-align:left;border-color:#000000;min-width:181px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">February 15, 2013</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 100px; text-align:right;border-color:#000000;min-width:100px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">15,256</font></td><td style="width: 167px; text-align:left;border-color:#000000;min-width:167px;"> </td></tr></table></div>
CY2009Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	18604	shares
CY2010Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	17310	shares
CY2011Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	15655	shares
CY2012Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	16693	shares
CY2011Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	500000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	1400000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	1400000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	1200000	USD
CY2012	mgee	Share Based Compensation Arrangement By Share Based Payment Award Cash Payment Prior Activity ShareBasedCompensationArrangementByShareBasedPaymentAwardCashPaymentPriorActivity	600000	USD
CY2012	mgee	Share Based Compensation Arrangement By Share Based Payment Award Forfeitures ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitures	0	USD
CY2012Q4	mgee	Share Based Compensation Arrangement By Share Based Payment Award Vested ShareBasedCompensationArrangementByShareBasedPaymentAwardVested	4000000	USD
CY2013Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	15256	shares
CY2011	mgee	Share Based Compensation Arrangement By Share Based Payment Award Forfeitures ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitures	0	USD
CY2010	mgee	Share Based Compensation Arrangement By Share Based Payment Award Forfeitures ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitures	0	USD
CY2012	mgee	Regional Transmission Organization Reduction To Sales And Purchased Power Expense From Net Basis Reporting RegionalTransmissionOrganizationReductionToSalesAndPurchasedPowerExpenseFromNetBasisReporting	75900000	USD
CY2011	mgee	Regional Transmission Organization Reduction To Sales And Purchased Power Expense From Net Basis Reporting RegionalTransmissionOrganizationReductionToSalesAndPurchasedPowerExpenseFromNetBasisReporting	102100000	USD
CY2010	mgee	Regional Transmission Organization Reduction To Sales And Purchased Power Expense From Net Basis Reporting RegionalTransmissionOrganizationReductionToSalesAndPurchasedPowerExpenseFromNetBasisReporting	94900000	USD
CY2011Q4	mgee	Outstanding Interest In Chattel Paper Receivables OutstandingInterestInChattelPaperReceivables	4300000	USD
CY2012	us-gaap	Derivatives Methods Of Accounting Hedging Derivatives DerivativesMethodsOfAccountingHedgingDerivatives	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:45px;">As part of its regular operations, MGE enters into contracts, including options, swaps, futures, forwards, and other contractual commitments, to manage its exposure to commodity prices and gas revenues. To the extent that these contracts are derivatives, MGE assesses whether or not the normal purchases or normal sales exclusion applies. For contracts to which this exclusion cannot be applied, MGE Energy and MGE recognize such derivatives in the consolidated balance sheets at fair value</font><font style="font-family:Times New Roman;font-size:10pt;">.</font><font style="font-family:Times New Roman;font-size:10pt;"> The majority of MGE's derivative activities are conducted in accordance with its electric and gas risk management program, which is approved by the PSCW and limits the volume MGE can hedge with specific risk management strategies. The maximum length of time over which cash flows related to energy commodities can be hedged </font><font style="font-family:Times New Roman;font-size:10pt;">is</font><font style="font-family:Times New Roman;font-size:10pt;"> four</font><font style="font-family:Times New Roman;font-size:10pt;"> years. If the derivative qualifies for regulatory deferral, the derivatives are marked to fair value and are offset with a corresponding regulatory asset or liability. The deferred gain or loss is recognized in earnings in the delivery month applicable to the instrument. Gains and losses related to hedges qualifying for regulatory treatment are recoverable in gas rates through the PGA or in electric rates as a component of the fuel rules mechanism</font></p>
CY2012Q4	mgee	Gross Notional Amount Of Commodity Derivatives Megawatt Hours GrossNotionalAmountOfCommodityDerivativesMegawattHours	444650	MWh
CY2012Q4	mgee	Gross Notional Amount Of Commodity Dekatherms GrossNotionalAmountOfCommodityDekatherms	1980000	Dth
CY2012Q4	mgee	Gross Notional Amount Of Ftrs Megawatts GrossNotionalAmountOfFtrsMegawatts	2670	MW
CY2011Q4	mgee	Gross Notional Amount Of Ftrs Megawatts GrossNotionalAmountOfFtrsMegawatts	2382	MW
CY2011Q4	mgee	Gross Notional Amount Of Commodity Dekatherms GrossNotionalAmountOfCommodityDekatherms	4030000	Dth
CY2011Q4	mgee	Gross Notional Amount Of Commodity Derivatives Megawatt Hours GrossNotionalAmountOfCommodityDerivativesMegawattHours	482545	MWh
CY2010Q4	mgee	Outstanding Interest In Chattel Paper Receivables OutstandingInterestInChattelPaperReceivables	3600000	USD
CY2012Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	200000	USD
CY2012	mgee	Authorized Rate Increase Decrease Gas AuthorizedRateIncreaseDecreaseGas	600000	USD
CY2012	mgee	Electric Fuel Deferred Costs Upper Threshold ElectricFuelDeferredCostsUpperThreshold	1.02	pure
CY2012	mgee	Electric Fuel Deferred Costs Lower Threshold ElectricFuelDeferredCostsLowerThreshold	0.98	pure
CY2011	mgee	Authorized Electric Fuel Costs Refund AuthorizedElectricFuelCostsRefund	300000	USD
CY2011Q4	mgee	Derivative Fair Value Of Derivative Net Exchange Traded And Ftrs DerivativeFairValueOfDerivativeNetExchangeTradedAndFtrs	-2800000	USD
CY2012Q4	mgee	Derivative Fair Value Of Derivative Net Exchange Traded And Ftrs DerivativeFairValueOfDerivativeNetExchangeTradedAndFtrs	300000	USD
CY2012Q4	mgee	Derivative Fair Value Of Derivative Net Ppa DerivativeFairValueOfDerivativeNetPpa	-72600000	USD
CY2011Q4	mgee	Derivative Fair Value Of Derivative Net Ppa DerivativeFairValueOfDerivativeNetPpa	-39500000	USD
CY2012Q4	mgee	Collateral Required To Post For Ppa Minimum CollateralRequiredToPostForPpaMinimum	20000000	USD
CY2012Q4	mgee	Collateral Required To Post For Ppa Maximum CollateralRequiredToPostForPpaMaximum	40000000	USD
CY2012Q4	mgee	Counterparties In Net Liability Position CounterpartiesInNetLiabilityPosition	0	USD
CY2012Q4	mgee	Derivative Collateral Right To Reclaim Cash Ppa DerivativeCollateralRightToReclaimCashPpa	0	USD
CY2011Q4	mgee	Counterparties In Net Liability Position CounterpartiesInNetLiabilityPosition	0	USD
CY2012	mgee	Authorized Percent Increase Decrease Electric AuthorizedPercentIncreaseDecreaseElectric	0.043	pure
CY2012	mgee	Authorized Percent Increase Decrease Gas AuthorizedPercentIncreaseDecreaseGas	0.003	pure
CY2012	mgee	Authorized Rate Increase Decrease Electric AuthorizedRateIncreaseDecreaseElectric	15700000	USD
CY2010	mgee	Authorized Rate Increase Decrease Electric AuthorizedRateIncreaseDecreaseElectric	11900000	USD
CY2010	mgee	Authorized Percent Increase Decrease Electric AuthorizedPercentIncreaseDecreaseElectric	0.033	pure
CY2011	mgee	Authorized Percent Increase Decrease Electric AuthorizedPercentIncreaseDecreaseElectric	0.023	pure
CY2011	mgee	Authorized Return On Common Stock AuthorizedReturnOnCommonStock	0.103	pure
CY2011	mgee	Authorized Rate Increase Decrease Electric AuthorizedRateIncreaseDecreaseElectric	8000000	USD
CY2011	mgee	Authorized Percent Increase Decrease Gas AuthorizedPercentIncreaseDecreaseGas	0.01	pure
CY2011	mgee	Authorized Rate Increase Decrease Gas AuthorizedRateIncreaseDecreaseGas	1900000	USD
CY2011	mgee	Fuel Rules Bandwidth FuelRulesBandwidth	0.02	pure
CY2011Q4	mgee	Utility Common Equity UtilityCommonEquity	0.581	pure
CY2013	mgee	Authorized Rate Increase Decrease Electric AuthorizedRateIncreaseDecreaseElectric	14900000	USD
CY2013	mgee	Authorized Rate Increase Decrease Gas AuthorizedRateIncreaseDecreaseGas	1600000	USD
CY2013	mgee	Authorized Percent Increase Decrease Electric AuthorizedPercentIncreaseDecreaseElectric	0.038	pure
CY2013	mgee	Authorized Percent Increase Decrease Gas AuthorizedPercentIncreaseDecreaseGas	0.01	pure
CY2013	mgee	Authorized Return On Common Stock AuthorizedReturnOnCommonStock	0.103	pure
CY2013	mgee	Fuel Rules Bandwidth FuelRulesBandwidth	0.02	pure
CY2012Q4	mgee	Increased Decreased Electric Fuel Costs Deferred IncreasedDecreasedElectricFuelCostsDeferred	-6200000	USD
CY2010	mgee	Authorized Percent Increase Decrease Gas AuthorizedPercentIncreaseDecreaseGas	-0.0074	pure
CY2010	mgee	Fuel Rules Bandwidth FuelRulesBandwidth	0.02	pure
CY2010	mgee	Authorized Return On Common Stock AuthorizedReturnOnCommonStock	0.104	pure
CY2010Q4	mgee	Utility Common Equity UtilityCommonEquity	0.553	pure
CY2010	mgee	Authorized Rate Increase Decrease Gas AuthorizedRateIncreaseDecreaseGas	-1500000	USD
CY2012	mgee	Fuel Rules Bandwidth FuelRulesBandwidth	0.02	pure
CY2012Q4	mgee	Purchase Power Agreement Osceola PurchasePowerAgreementOsceola	50	MW
CY2011Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	200000	USD
CY2010Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	100000	USD
CY2012Q4	mgee	Chattel Paper Purchase Agreement Maximum Interest ChattelPaperPurchaseAgreementMaximumInterest	10000000	USD
CY2012Q4	mgee	Outstanding Interest In Chattel Paper Receivables OutstandingInterestInChattelPaperReceivables	4500000	USD
CY2012Q4	mgee	Total Cost Of Smart Grid Projects TotalCostOfSmartGridProjects	11000000	USD
CY2012	mgee	Smart Grid Expenditures SmartGridExpenditures	8400000	USD
CY2012	mgee	Chattel Paper Gain Loss On Sales Of Loans ChattelPaperGainLossOnSalesOfLoans	100000	USD
CY2011	mgee	Chattel Paper Gain Loss On Sales Of Loans ChattelPaperGainLossOnSalesOfLoans	100000	USD
CY2010	mgee	Chattel Paper Gain Loss On Sales Of Loans ChattelPaperGainLossOnSalesOfLoans	100000	USD
CY2012	us-gaap	Servicing Asset At Amortized Value Amortization ServicingAssetAtAmortizedValueAmortization	100000	USD
CY2012	mgee	Chattel Paper Loan Sales ChattelPaperLoanSales	1200000	USD
CY2011	mgee	Chattel Paper Loan Sales ChattelPaperLoanSales	1500000	USD
CY2010	mgee	Chattel Paper Loan Sales ChattelPaperLoanSales	500000	USD
CY2012Q4	mgee	Chattel Paper Agreement Principal Payments ChattelPaperAgreementPrincipalPayments	1200000	USD
CY2011Q4	mgee	Chattel Paper Agreement Principal Payments ChattelPaperAgreementPrincipalPayments	800000	USD
CY2010Q4	mgee	Chattel Paper Agreement Principal Payments ChattelPaperAgreementPrincipalPayments	700000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	2600000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3200000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3200000	USD
CY2012Q4	mgee	Smart Grid Grant Amount SmartGridGrantAmount	5500000	USD
CY2012Q4	mgee	Minimum Capacity For Regulation Csapr MinimumCapacityForRegulationCsapr	25	MW
CY2012Q4	mgee	Investment Capital Contribution Commitment InvestmentCapitalContributionCommitment	2000000	USD
CY2012Q4	mgee	Green Energy Projects Expenditures GreenEnergyProjectsExpenditures	300000	USD
CY2012Q4	mgee	Venture Debt Investment Commitment VentureDebtInvestmentCommitment	1000000	USD
CY2012Q4	mgee	Venture Debt Remaining Investment Commitment VentureDebtRemainingInvestmentCommitment	500000	USD
CY2012Q4	mgee	Minimum Electricity Generated From Renewables MinimumElectricityGeneratedFromRenewables	0.10	pure
CY2012Q4	mgee	Cair Phase One Emission Reductions For Nox CairPhaseOneEmissionReductionsForNox	0.55	pure
CY2012Q4	mgee	Cair Phase One Emission Reductions For So2 CairPhaseOneEmissionReductionsForSo2	0.40	pure
CY2012Q4	mgee	Cair Phase Two Emission Reductions For Nox CairPhaseTwoEmissionReductionsForNox	0.65	pure
CY2012Q4	mgee	Cair Phase Two Emission Reductions For So2 CairPhaseTwoEmissionReductionsForSo2	0.70	pure
CY2012Q4	mgee	Minimum Amount Fleet Wide Mercury Reduction In Wisconsin Phase Two MinimumAmountFleetWideMercuryReductionInWisconsinPhaseTwo	0.90	pure
CY2012Q4	mgee	Coal Fired Electric Generating Units Mw Requirement CoalFiredElectricGeneratingUnitsMwRequirement	150	MW
CY2012Q4	mgee	Columbia Environmental Project Commitments ColumbiaEnvironmentalProjectCommitments	73400000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	19173000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	19913000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	49000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1021000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	221000	USD
CY2012	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-1254000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	18768000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	85000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	157000	USD
CY2011	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-1739000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1071000	USD
CY2011	mgee	Asset Retirement Obligation Revision Of Estimate Columbia Landfill AssetRetirementObligationRevisionOfEstimateColumbiaLandfill	-1600000	USD
CY2012	mgee	Asset Retirement Obligation Revision Of Estimate Blount Asbestos AssetRetirementObligationRevisionOfEstimateBlountAsbestos	-1300000	USD
CY2012	mgee	Asset Retirement Obligation Revision Of Estimate Columbia Landfill AssetRetirementObligationRevisionOfEstimateColumbiaLandfill	0	USD
CY2011	mgee	Asset Retirement Obligation Revision Of Estimate Blount Asbestos AssetRetirementObligationRevisionOfEstimateBlountAsbestos	0	USD
CY2012Q4	mgee	Elm Road Unit Costs Prudently Incurred ElmRoadUnitCostsPrudentlyIncurred	1	pure
CY2012Q4	mgee	Authorized Elm Road Unit Costs Recovery In Rates AuthorizedElmRoadUnitCostsRecoveryInRates	0.995	pure
CY2012Q4	mgee	Deferred Recovery Costs DeferredRecoveryCosts	1800000	USD
CY2012	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2012	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	541323000	USD
CY2012	mgee	Utilities Operating Expense Excluding Depreciation And Amortization UtilitiesOperatingExpenseExcludingDepreciationAndAmortization	389853000	USD
CY2011	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2011	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	546382000	USD
CY2011	mgee	Utilities Operating Expense Excluding Depreciation And Amortization UtilitiesOperatingExpenseExcludingDepreciationAndAmortization	397572000	USD
CY2010	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2010	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	532591000	USD
CY2010	mgee	Utilities Operating Expense Excluding Depreciation And Amortization UtilitiesOperatingExpenseExcludingDepreciationAndAmortization	398029000	USD
CY2012	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	98435000	USD
CY2011	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	65176000	USD
CY2010Q4	us-gaap	Assets Assets	1317893000	USD
CY2010	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	60082000	USD
CY2012Q1	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	89936000	USD
CY2012Q2	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	96339000	USD
CY2012Q3	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	118914000	USD
CY2012Q4	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	87176000	USD
CY2012Q1	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	57019000	USD
CY2012Q2	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	18629000	USD
CY2012Q3	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	16587000	USD
CY2012Q4	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	47492000	USD
CY2012Q1	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	2304000	USD
CY2012Q2	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	2253000	USD
CY2012Q3	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	2337000	USD
CY2011Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.375
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.77
CY2012Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6208000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	16048000	USD
CY2012Q4	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	2337000	USD
CY2012Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	149259000	USD
CY2012Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	117221000	USD
CY2012Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	137838000	USD
CY2012Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	137005000	USD
CY2012Q1	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	120815000	USD
CY2012Q2	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	92140000	USD
CY2012Q3	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	97950000	USD
CY2012Q4	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	117655000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	28444000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	25081000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	39888000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	19350000	USD
CY2012Q1	us-gaap	Interest And Other Income InterestAndOtherIncome	-2534000	USD
CY2012Q2	us-gaap	Interest And Other Income InterestAndOtherIncome	-2215000	USD
CY2012Q3	us-gaap	Interest And Other Income InterestAndOtherIncome	-1993000	USD
CY2012Q4	us-gaap	Interest And Other Income InterestAndOtherIncome	-2656000	USD
CY2012Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9862000	USD
CY2012Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8596000	USD
CY2012Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14253000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	14270000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	23642000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	10486000	USD
CY2012Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.383
CY2012Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.383
CY2012Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.395
CY2012Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.395
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.46
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.69
CY2011Q4	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	84054000	USD
CY2011Q4	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	45523000	USD
CY2011Q4	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	1369000	USD
CY2011Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	130946000	USD
CY2011Q4	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	113507000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	17439000	USD
CY2011Q4	us-gaap	Interest And Other Income InterestAndOtherIncome	-2781000	USD
CY2011Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5274000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	9384000	USD
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
CY2011Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.383
CY2011Q1	us-gaap	Interest And Other Income InterestAndOtherIncome	-2464000	USD
CY2011Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	164605000	USD
CY2011Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10651000	USD
CY2011Q1	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	1161000	USD
CY2011Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.375
CY2011Q1	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	77437000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	17783000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	30898000	USD
CY2011Q1	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	133707000	USD
CY2011Q1	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	86007000	USD
CY2010	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	49500	USD
CY2010	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	2508471	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	23197000	USD
CY2011Q2	us-gaap	Interest And Other Income InterestAndOtherIncome	-2902000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	36334000	USD
CY2011Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12495000	USD
CY2011Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	133572000	USD
CY2011Q3	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	17249000	USD
CY2011Q3	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	1360000	USD
CY2011Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.383
CY2011Q3	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	97238000	USD
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.91
CY2011Q2	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	25062000	USD
CY2011Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	117259000	USD
CY2011Q2	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	90834000	USD
CY2011Q2	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	94062000	USD
CY2011Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7572000	USD
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.55
CY2011Q2	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	1363000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	12723000	USD
CY2011Q3	us-gaap	Interest And Other Income InterestAndOtherIncome	-2801000	USD
CY2011Q3	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	114963000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	21038000	USD
CY2011Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	4100333	USD
CY2012	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	2825300	USD
CY2012	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	44400	USD
CY2012	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	2153915	USD
CY2012Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	4816118	USD
CY2011	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	2174729	USD
CY2011	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	49500	USD
CY2010Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	4588675	USD
CY2011	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	2712571	USD
CY2009Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	4242335	USD
CY2010	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	2805311	USD

Files In Submission

Name	View Source	Status
0001161728-13-000001-index-headers.html	Edgar Link	pending
0001161728-13-000001-index.html	Edgar Link	pending
0001161728-13-000001.txt	Edgar Link	pending
0001161728-13-000001-xbrl.zip	Edgar Link	pending
ex12_1.htm	Edgar Link	pending
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f10k_2012.htm	Edgar Link	pending
f10k_2012.pdf	Edgar Link	pending
f10k_2012002.gif	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
mgee-20121231.xml	Edgar Link	completed
mgee-20121231.xsd	Edgar Link	pending
mgee-20121231_cal.xml	Edgar Link	unprocessable
mgee-20121231_def.xml	Edgar Link	unprocessable
mgee-20121231_lab.xml	Edgar Link	unprocessable
mgee-20121231_pre.xml	Edgar Link	unprocessable
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$MGEE
MGE ENERGY INC Stock $mgee

2012 Q4 Form 10-K Financial Statement

#000116172813000001 Filed on February 26, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MGEE MGE ENERGY INC Stock $mgee

2012 Q4 Form 10-K Financial Statement

#000116172813000001 Filed on February 26, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MGEE
MGE ENERGY INC Stock $mgee