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COMMITMENTS AND CONTINGENCIES (Details 2) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended 1 Months Ended
Apr. 30, 2012
Dec. 31, 2014
MW
state
Jan. 31, 2013
item
Nov. 30, 2010
Electric        
Environmental Laws And Regulations        
Period for compliance 4 years      
Phase-in period for proposed standards 3 years      
Clean Air Interstate Rule | Electric        
Environmental Laws And Regulations        
Minimum capacity of power plant called to reduce emission levels of SO2 and NOx (in megawatts)   25ede_MinimumPowerPlantCapacityCalledToReduceEmissionLevelsOfSO2AndNOx
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_CleanAirInterstateRuleMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
Number of states in which fossil-fueled power plants are required to reduce emission levels of SO2 and NOx as per CAIR   28ede_NumberOfStatesFossilFueledPowerPlantsRequiredToReduceEmissionLevels
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_CleanAirInterstateRuleMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
Cross State Air Pollution Rule        
Environmental Laws And Regulations        
Period of business plan   5 years    
Cross State Air Pollution Rule | Electric        
Environmental Laws And Regulations        
Number of states in which fossil-fueled power plants are required to reduce emission levels of SO2 and NOx as per CAIR   23ede_NumberOfStatesFossilFueledPowerPlantsRequiredToReduceEmissionLevels
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_CrossStateAirPollutionRuleMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
Number of groups required to reduce SO2   2ede_NumberOfGroupsRequiredToReduceEmissionLevels
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_CrossStateAirPollutionRuleMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
NAAQS | Electric        
Environmental Laws And Regulations        
Number of states in which fossil-fueled power plants are required to reduce emission levels of SO2 and NOx as per CAIR   25ede_NumberOfStatesFossilFueledPowerPlantsRequiredToReduceEmissionLevels
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_NationalAmbientAirQualityStandardsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
Particulate matter primary annual standard (in micrograms per cubic meter of air)     12ede_AmountOfParticulateMatterPrimaryAnnualStandard
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_NationalAmbientAirQualityStandardsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		  
Surface Impoundments | Electric        
Environmental Laws And Regulations        
Number of options in the EPA proposal   2ede_NumberOfOptionsAvailableInEPAProposal
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_SurfaceImpoundmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
Surface Impoundments | Electric | High end of range        
Environmental Laws And Regulations        
Potential cost for construction of new landfill and conversion of existing ash handling from wet to dry system(s)   15ede_PotentialCostForConstructionOfNewLandfillAndConversionOfAshHandlingSystemFromWetToDry
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_SurfaceImpoundmentsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
Surface Impoundments | Iatan | Electric        
Environmental Laws And Regulations        
Percentage of ownership in a coal ash impoundment at a generating facility   12.00%ede_PercentageOfOwnershipInCoalAshImpoundmentAtGeneratingFacility
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_SurfaceImpoundmentsMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ede_IatanMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
Surface Impoundments | Plum point | Electric        
Environmental Laws And Regulations        
Percentage of ownership in a coal ash impoundment at a generating facility   7.52%ede_PercentageOfOwnershipInCoalAshImpoundmentAtGeneratingFacility
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_SurfaceImpoundmentsMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ede_PlumPointMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
Renewable Energy | Electric        
Environmental Laws And Regulations        
Minimum percentage of Missouri retail sales required to generate or purchase electricity in 2014   5ede_MinimumPercentageOfRetailSalesToGenerateOrPurchaseElectricityFromRenewableEnergySourcesIn2014
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_RenewableEnergyMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
Minimum percentage of Missouri retail sales required to generate or purchase electricity by 2021   15.00%ede_MinimumPercentageOfRetailSalesToGenerateOrPurchaseElectricityFromRenewableEnergySourcesBy2021
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_RenewableEnergyMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
Percentage of Missouri retail sales required to generate or purchase solar energy   2.00%ede_PercentRequirementToGenerateOrPurchaseElectricityFromSolarEnergy
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_RenewableEnergyMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember		    
Percentage of Kansas retail customer peak capacity required to be sourced from renewable energy in 2012       10.00%ede_PercentageOfKansasRetailCustomerPeakCapacityFromRenewableEnergySourcesIn2012
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_RenewableEnergyMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember
Percentage of Kansas retail customer peak capacity required to be sourced from renewable energy by 2016       15.00%ede_PercentageOfKansasRetailCustomerPeakCapacityFromRenewableEnergySourcesBy2016
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_RenewableEnergyMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember
Percentage of Kansas retail customer peak capacity required to be sourced from renewable energy by 2020       20.00%ede_PercentageOfKansasRetailCustomerPeakCapacityFromRenewableEnergySourcesBy2020
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_RenewableEnergyMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember
Green House Gases        
Environmental Laws And Regulations        
Percentage of carbon emission reduction from 2005 baseline levels by 2030, required by the proposed Clean Power Plan   30.00%ede_PercentageOfCarbonEmissionReductionRequiredAsPerProposedRuleFrom2005BaselineLevelsBy2030
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_GreenHouseGasesMember		    
Number of strategies to achieve the best system of emission reduction identified by EPA   4ede_NumberOfStrategiesToAchieveBestSystemOfEmissionReductionIdentifiedByEPA
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_GreenHouseGasesMember		    
Number of comments on proposed regulation for Carbon Pollution Standards for new power plants   2,000,000ede_NumberOfCommentsProposedRegulationForCarbonPollutionStandards
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_GreenHouseGasesMember		    
Power Plant Mercury And Air Toxics Rule | Electric        
Environmental Laws And Regulations        
Construction costs year to date   88.5ede_ConstructionCostsForProjectSpentToDate
/ ede_EnvironmentalLawsAndRegulationsAxis
= ede_PowerPlantMercuryAndAirToxicsRuleMember
/ us-gaap_StatementBusinessSegmentsAxis
= ede_ElectricMember