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Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Utility plant:    
Electric plant in service $ 3,515,280us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService $ 3,229,255us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Less accumulated depreciation and amortization (1,283,543)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation (1,266,672)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Net plant in service 2,231,737us-gaap_PropertyPlantAndEquipmentNet 1,962,583us-gaap_PropertyPlantAndEquipmentNet
Construction work in progress 198,216us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress 414,284us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Nuclear fuel; includes fuel in process of $57,766 and $46,996, respectively 195,955us-gaap_PublicUtilitiesPropertyPlantAndEquipmentFuel 185,185us-gaap_PublicUtilitiesPropertyPlantAndEquipmentFuel
Less accumulated amortization (84,295)ee_AccumulatedAmortizationNuclearFuel (73,701)ee_AccumulatedAmortizationNuclearFuel
Net nuclear fuel 111,660us-gaap_NuclearFuelNetOfAmortization 111,484us-gaap_NuclearFuelNetOfAmortization
Net utility plant 2,541,613us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet 2,488,351us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
Current assets:    
Cash and cash equivalents 7,974us-gaap_CashAndCashEquivalentsAtCarryingValue 40,504us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, principally trade, net of allowance for doubtful accounts of $1,726 and $2,253, respectively 65,337us-gaap_AccountsReceivableNetCurrent 71,165us-gaap_AccountsReceivableNetCurrent
Accumulated deferred income taxes 18,103us-gaap_DeferredTaxAssetsNetCurrent 13,957us-gaap_DeferredTaxAssetsNetCurrent
Inventories, at cost 47,079us-gaap_PublicUtilitiesInventory 45,889us-gaap_PublicUtilitiesInventory
Under-collection of fuel revenues 0us-gaap_DeferredFuelCost 10,253us-gaap_DeferredFuelCost
Prepayments and other 18,842us-gaap_PrepaidExpenseCurrent 12,213us-gaap_PrepaidExpenseCurrent
Total current assets 157,335us-gaap_AssetsCurrent 193,981us-gaap_AssetsCurrent
Deferred charges and other assets:    
Decommissioning trust funds 237,619us-gaap_DecommissioningFundInvestments 234,286us-gaap_DecommissioningFundInvestments
Regulatory assets 110,938us-gaap_RegulatoryAssetsNoncurrent 112,086us-gaap_RegulatoryAssetsNoncurrent
Other 31,007us-gaap_RegulatedEntityOtherAssetsNoncurrent 30,597us-gaap_RegulatedEntityOtherAssetsNoncurrent
Total deferred charges and other assets 379,564ee_DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent 376,969ee_DeferredChargesRegulatoryAssetsAndOtherAssetsNoncurrent
Total assets 3,078,512us-gaap_Assets 3,059,301us-gaap_Assets
Capitalization:    
Common stock, stated value $1 per share, 100,000,000 shares authorized, 65,704,207 and 65,725,246 shares issued, and 141,190 and 124,297 restricted shares, respectively 65,845us-gaap_CommonStockValue 65,850us-gaap_CommonStockValue
Capital in excess of stated value 318,584us-gaap_AdditionalPaidInCapitalCommonStock 318,515us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 1,024,692us-gaap_RetainedEarningsAccumulatedDeficit 1,032,537us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss, net of tax (9,878)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (8,001)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders equity subtotal before treasury stock 1,399,243ee_StockholdersEquitySubtotalBeforeTreasuryStock 1,408,901ee_StockholdersEquitySubtotalBeforeTreasuryStock
Treasury stock, 25,452,789 and 25,492,919 shares, respectively, at cost (423,978)us-gaap_TreasuryStockValue (424,647)us-gaap_TreasuryStockValue
Common stock equity 975,265us-gaap_StockholdersEquity 984,254us-gaap_StockholdersEquity
Long-term debt, net of current portion 1,134,205us-gaap_LongTermDebtNoncurrent 1,134,179us-gaap_LongTermDebtNoncurrent
Total capitalization 2,109,470us-gaap_CapitalizationLongtermDebtAndEquity 2,118,433us-gaap_CapitalizationLongtermDebtAndEquity
Current liabilities:    
Current maturities of long-term debt 15,000us-gaap_LongTermDebtCurrent 15,000us-gaap_LongTermDebtCurrent
Short-term borrowings under the revolving credit facility 58,345us-gaap_LinesOfCreditCurrent 14,532us-gaap_LinesOfCreditCurrent
Accounts payable, principally trade 48,865us-gaap_AccountsPayableTradeCurrent 78,862us-gaap_AccountsPayableTradeCurrent
Taxes accrued 24,347us-gaap_TaxesPayableCurrent 28,210us-gaap_TaxesPayableCurrent
Interest accrued 16,872us-gaap_InterestPayableCurrent 12,758us-gaap_InterestPayableCurrent
Over-collection of fuel revenues 6,366ee_DeferredFuelCostsOverCollected 932ee_DeferredFuelCostsOverCollected
Other 23,805us-gaap_OtherLiabilitiesCurrent 24,715us-gaap_OtherLiabilitiesCurrent
Total current liabilities 193,600us-gaap_LiabilitiesCurrent 175,009us-gaap_LiabilitiesCurrent
Deferred Credits and Other Liabilities:    
Accumulated deferred income taxes 484,564us-gaap_DeferredTaxLiabilitiesNoncurrent 474,154us-gaap_DeferredTaxLiabilitiesNoncurrent
Accrued pension liability 92,246us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent 94,272us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
Accrued post-retirement benefit liability 60,717us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent 59,342us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
Asset retirement obligation 76,290us-gaap_AssetRetirementObligationsNoncurrent 74,577us-gaap_AssetRetirementObligationsNoncurrent
Regulatory liabilities 25,175us-gaap_RegulatoryLiabilityNoncurrent 26,099us-gaap_RegulatoryLiabilityNoncurrent
Other 36,450us-gaap_OtherLiabilitiesNoncurrent 37,415us-gaap_OtherLiabilitiesNoncurrent
Total deferred credits and other liabilities 775,442us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent 765,859us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent
Commitments and contingencies      
Total capitalization and liabilities $ 3,078,512us-gaap_LiabilitiesAndStockholdersEquity $ 3,059,301us-gaap_LiabilitiesAndStockholdersEquity