XML 93 R93.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Commitments and Contingencies (Details-4) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013
Columbia Environmental Project [Member] | MGE [Member] |
Columbia |
Jointly owned utility plant, total expected capital expenditures | $ 135.0
Columbia Units [Member] |
Columbia |
Contractual commitments | 14.7
Envrionmental civil penalty expense | 0.2
Accrual for future environmental mitigation projects | $ 0.6
Wisconsin Energy Efficiency and Renewables Act [Member] |
Energy Efficiency and Renewables |
Minimum electricity generated from renewable resources by 2015 | 10.00%
Clean Air Interstate Rule [Member] |
Air Quality |
Minimum capacity of fossil-fuel fired electric generating units required to meet certain air quality regulations (in MW) | 25
Fossil-fuel EGU emission reduction levels as compared to 2003, phase two (beginning in 2015), NOx | 65.00%
Fossil-fuel EGU emission reduction levels as compared to 2003, phase two (beginning in 2015), SO2 | 70.00%

X
- Definition Accrual for future environmental mitigation projects as a result of environmental regulation violations. + References No definition available. + Details
Name: | mgee_AccrualForFutureEnvironmentalMitigationProjects
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | mgee_AirQualityRegulationsAbstract
Namespace Prefix: | mgee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | mgee_ColumbiaCommitmentsAbstract
Namespace Prefix: | mgee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | mgee_EnergyEfficiencyAndRenewablesAbstract
Namespace Prefix: | mgee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Civil penalty expense related to environmental regulation violations. + References No definition available. + Details
Name: | mgee_EnvironmentalCivilPenaltyExpense
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total expected capital expenditures to be incurred during construction of an asset. + References No definition available. + Details
Name: | mgee_JointlyOwnedUtilityPlantTotalExpectedCapitalExpenditures
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The minimum capacity of fossil-fuel fired electric generating units required to abide by certain air quality regulations as deemed by a regulatory agency. + References No definition available. + Details
Name: | mgee_PublicUtilitiesAirQualityRegulationsMinimumCapacityOnFossilFuelFiredElectricGeneratingUnit
Namespace Prefix: | mgee_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The reduction of annual regional emission for NOx under the second phase (beginning in 2015) as required by teh regulatory agency. + References No definition available. + Details
Name: | mgee_PublicUtilitiesAirQualityRegulationsPhaseTwoRequired2015FossilFuelElectricGeneratingUnitEmissionReductionLevelsAsComparedTo2003NitrogenOxide
Namespace Prefix: | mgee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The reduction of annual regional emission for SO2 under the second phase (beginning in 2015) as required by the regulatory agency. + References No definition available. + Details
Name: | mgee_PublicUtilitiesAirQualityRegulationsPhaseTwoRequired2015FossilFuelElectricGeneratingUnitEmissionReductionLevelsAsComparedTo2003SulfurOxide
Namespace Prefix: | mgee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The minimum electricity generated from renewable resources by 2015 set by regulatory agency + References No definition available. + Details
Name: | mgee_PublicUtilitiesMinimumElectricityGeneratedFromRenewableResourcesBy2015
Namespace Prefix: | mgee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant