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INCOME TAXES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Current income taxes:        
Federal $ (2,350,000)us-gaap_CurrentFederalTaxExpenseBenefit $ 6,726,000us-gaap_CurrentFederalTaxExpenseBenefit $ 1,552,000us-gaap_CurrentFederalTaxExpenseBenefit  
State (123,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,495,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 708,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit  
TOTAL (2,473,000)us-gaap_CurrentIncomeTaxExpenseBenefit 9,221,000us-gaap_CurrentIncomeTaxExpenseBenefit 2,260,000us-gaap_CurrentIncomeTaxExpenseBenefit  
Deferred income taxes:        
Federal 36,620,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 24,954,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 28,210,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit  
State 5,216,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 3,554,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 4,018,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit  
TOTAL 41,836,000us-gaap_DeferredIncomeTaxExpenseBenefit 28,508,000us-gaap_DeferredIncomeTaxExpenseBenefit 32,228,000us-gaap_DeferredIncomeTaxExpenseBenefit  
Investment tax credit amortization (143,000)us-gaap_InvestmentTaxCredit (237,000)us-gaap_InvestmentTaxCredit (329,000)us-gaap_InvestmentTaxCredit  
TOTAL INCOME TAX EXPENSE 39,220,000ede_IncomeTaxExpenseBenefitContinuingOperations1 37,492,000ede_IncomeTaxExpenseBenefitContinuingOperations1 34,159,000ede_IncomeTaxExpenseBenefitContinuingOperations1  
Deferred tax assets and liabilities as reflected on consolidated balance sheet        
Current deferred tax assets, net 19,200,000us-gaap_DeferredTaxAssetsNetCurrent 7,222,000us-gaap_DeferredTaxAssetsNetCurrent    
Non-current deferred tax liabilities, net 377,452,000us-gaap_DeferredTaxLiabilitiesNoncurrent 324,266,000us-gaap_DeferredTaxLiabilitiesNoncurrent    
NET DEFERRED TAX LIABILITIES 358,252,000us-gaap_DeferredTaxAssetsLiabilitiesNet 317,044,000us-gaap_DeferredTaxAssetsLiabilitiesNet    
Deferred tax assets:        
Plant related basis differences 25,349,000ede_DeferredTaxAssetsPlantRelatedBasisDifferences 23,344,000ede_DeferredTaxAssetsPlantRelatedBasisDifferences    
Net operating loss 22,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards      
Disallowed plant costs 1,754,000ede_DeferredTaxAssetsDisallowedPlantCost 1,841,000ede_DeferredTaxAssetsDisallowedPlantCost    
Gains on hedging transactions 1,260,000us-gaap_DeferredTaxAssetsHedgingTransactions 1,324,000us-gaap_DeferredTaxAssetsHedgingTransactions    
Regulated liabilities related to income taxes 13,350,000us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities 13,576,000us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities    
Pensions and other post-retirement benefits 1,175,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 544,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits    
Carry forward of income tax credit 6,367,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 6,374,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards    
Other 1,633,000us-gaap_DeferredTaxAssetsOther 1,633,000us-gaap_DeferredTaxAssetsOther    
Total deferred tax assets 72,888,000us-gaap_DeferredTaxAssetsNet 48,636,000us-gaap_DeferredTaxAssetsNet    
Deferred tax liabilities:        
Depreciation, amortization and other plant related differences 363,337,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 297,175,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment    
Regulated assets related to income 37,180,000us-gaap_DeferredTaxLiabilitiesRegulatoryAssets 37,806,000us-gaap_DeferredTaxLiabilitiesRegulatoryAssets    
Loss on reacquired debt 3,828,000ede_DeferredTaxLiabilitiesLossOnReacquiredDebt 4,085,000ede_DeferredTaxLiabilitiesLossOnReacquiredDebt    
Amortization of intangibles 9,168,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 8,089,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets    
Deferred construction accounting costs 6,082,000ede_DeferredTaxLiabilitiesDeferredConstructionAccountingCosts 6,977,000ede_DeferredTaxLiabilitiesDeferredConstructionAccountingCosts    
Other 11,545,000us-gaap_DeferredTaxLiabilitiesOther 11,548,000us-gaap_DeferredTaxLiabilitiesOther    
Total deferred tax liabilities 431,140,000us-gaap_DeferredTaxLiabilities 365,680,000us-gaap_DeferredTaxLiabilities    
NET DEFERRED TAX LIABILITIES 358,252,000us-gaap_DeferredTaxAssetsLiabilitiesNet 317,044,000us-gaap_DeferredTaxAssetsLiabilitiesNet    
Effective Income Tax Rates        
Federal statutory income tax rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Increase (decrease) in income tax rate resulting from:        
State income tax (net of federal benefit) (as a percent) 3.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes  
Investment tax credit amortization (as a percent) (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment  
Effect of ratemaking on property related differences (as a percent) (1.70%)ede_EffectiveIncomeTaxRateReconciliationEffectOfRatemakingOnPropertyRelatedDifferences (1.10%)ede_EffectiveIncomeTaxRateReconciliationEffectOfRatemakingOnPropertyRelatedDifferences (0.20%)ede_EffectiveIncomeTaxRateReconciliationEffectOfRatemakingOnPropertyRelatedDifferences  
Other (as a percent) 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments  
Consolidated effective federal and state income tax rates (as a percent) 36.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Loss carry back period 2 years      
Advanced coal investment tax credit       17,700,000ede_InvestmentTaxCreditAdvancedCoal
Maximum tax credit utilized   9,000,000ede_InvestmentTaxCreditUtilizedMaximum 700,000ede_InvestmentTaxCreditUtilizedMaximum  
Adjustment due to change in accounting method $ 33,000,000ede_AdjustmentToIncomeTaxDueToChangeInMethodOfAccounting