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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
UTILITY PLANT:    
Utility plant in service $ 4,811,311us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService $ 4,658,023us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Less accumulated depreciation 2,250,104us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation 2,264,606us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Utility plant in service - net 2,561,207cik0000728391_PublicUtilitiesPropertyPlantAndEquipmentPlantInServiceNet 2,393,417cik0000728391_PublicUtilitiesPropertyPlantAndEquipmentPlantInServiceNet
Construction work in progress 369,602us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress 447,399us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Spare parts inventory 14,629cik0000728391_PublicUtilitiesPropertyPlantAndEquipmentSparePartsInventory 14,816cik0000728391_PublicUtilitiesPropertyPlantAndEquipmentSparePartsInventory
Property held for future use 1,002us-gaap_PlantHeldForFutureUseAmount 1,002us-gaap_PlantHeldForFutureUseAmount
Utility plant - net 2,946,440us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet 2,856,634us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
OTHER ASSETS:    
Nonutility property - at cost, less accumulated depreciation 521us-gaap_PropertyPlantAndEquipmentNet 522us-gaap_PropertyPlantAndEquipmentNet
Other long-term assets 6,313us-gaap_OtherInvestments 6,221us-gaap_OtherInvestments
Other assets - net 6,834us-gaap_OtherAssetsNoncurrent 6,743us-gaap_OtherAssetsNoncurrent
CURRENT ASSETS:    
Cash and cash equivalents 29,258us-gaap_CashAndCashEquivalentsAtCarryingValue 26,933us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable and unbilled revenue (less allowance for doubtful accounts of $3,086 and $2,076, respectively) 138,861us-gaap_ReceivablesNetCurrent 139,709us-gaap_ReceivablesNetCurrent
Fuel inventories - at average cost 55,370us-gaap_PublicUtilitiesInventory 47,550us-gaap_PublicUtilitiesInventory
Materials and supplies - at average cost 61,266cik0000728391_MaterialsAndSuppliesAverageCost 60,185cik0000728391_MaterialsAndSuppliesAverageCost
Deferred tax asset - current 49,216us-gaap_DeferredTaxAssetsNetCurrent 61,782us-gaap_DeferredTaxAssetsNetCurrent
Regulatory assets 91us-gaap_RegulatoryAssetsCurrent 93us-gaap_RegulatoryAssetsCurrent
Prepayments and other current assets 23,711us-gaap_PrepaidExpenseAndOtherAssetsCurrent 23,161us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 357,773us-gaap_AssetsCurrent 359,413us-gaap_AssetsCurrent
DEFERRED DEBITS:    
Regulatory assets 421,557us-gaap_RegulatoryAssetsNoncurrent 419,193us-gaap_RegulatoryAssetsNoncurrent
Miscellaneous 26,772us-gaap_OtherAssetsMiscellaneous 25,835us-gaap_OtherAssetsMiscellaneous
Total deferred debits 448,329cik0000728391_DeferredDebits 445,028cik0000728391_DeferredDebits
TOTAL 3,759,376us-gaap_Assets 3,667,818us-gaap_Assets
Common shareholders' equity:    
Paid in capital 168,733us-gaap_AdditionalPaidInCapitalCommonStock 168,610us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (14,180)us-gaap_RetainedEarningsAccumulatedDeficit (17,339)us-gaap_RetainedEarningsAccumulatedDeficit
Total common shareholders' equity 154,553us-gaap_StockholdersEquity 151,271us-gaap_StockholdersEquity
Cumulative preferred stock of subsidiary 59,784cik0000728391_CumulativePreferredStockOfSubsidiary 59,784cik0000728391_CumulativePreferredStockOfSubsidiary
Long-term debt 1,819,427us-gaap_LongTermDebtNoncurrent 1,951,013us-gaap_LongTermDebtNoncurrent
Total capitalization 2,033,764us-gaap_CapitalizationLongtermDebtAndEquity 2,162,068us-gaap_CapitalizationLongtermDebtAndEquity
CURRENT LIABILITIES:    
Short-term and current portion of long-term debt (Note 4) 243,850us-gaap_DebtCurrent 50,000us-gaap_DebtCurrent
Accounts payable 134,105us-gaap_AccountsPayableCurrent 110,623us-gaap_AccountsPayableCurrent
Accrued expenses 22,864us-gaap_AccruedLiabilitiesCurrent 25,187us-gaap_AccruedLiabilitiesCurrent
Accrued real estate and personal property taxes 24,243us-gaap_TaxesPayableCurrent 19,177us-gaap_TaxesPayableCurrent
Regulatory liabilities 25,942us-gaap_RegulatoryLiabilityCurrent 27,943us-gaap_RegulatoryLiabilityCurrent
Accrued interest 49,380us-gaap_InterestPayableCurrent 30,726us-gaap_InterestPayableCurrent
Customer deposits 28,664us-gaap_CustomerDepositsCurrent 28,337us-gaap_CustomerDepositsCurrent
Other current liabilities 13,334us-gaap_OtherLiabilitiesCurrent 12,881us-gaap_OtherLiabilitiesCurrent
Total current liabilities 542,382us-gaap_LiabilitiesCurrent 304,874us-gaap_LiabilitiesCurrent
DEFERRED CREDITS AND OTHER LONG-TERM LIABILITIES:    
Regulatory liabilities 618,206us-gaap_RegulatoryLiabilityNoncurrent 610,917us-gaap_RegulatoryLiabilityNoncurrent
Deferred income taxes - net 422,356us-gaap_DeferredTaxLiabilitiesNoncurrent 421,127us-gaap_DeferredTaxLiabilitiesNoncurrent
Non-current income tax liability 7,053us-gaap_AccruedIncomeTaxesNoncurrent 7,042us-gaap_AccruedIncomeTaxesNoncurrent
Unamortized investment tax credit 4,899us-gaap_AccumulatedDeferredInvestmentTaxCredit 5,229us-gaap_AccumulatedDeferredInvestmentTaxCredit
Accrued pension and other postretirement benefits 69,885us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 96,464us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Asset retirement obligations 59,826us-gaap_AssetRetirementObligationsNoncurrent 59,098us-gaap_AssetRetirementObligationsNoncurrent
Miscellaneous 1,005us-gaap_OtherLiabilitiesNoncurrent 999us-gaap_OtherLiabilitiesNoncurrent
Total deferred credits and other long-term liabilities 1,183,230us-gaap_LiabilitiesNoncurrent 1,200,876us-gaap_LiabilitiesNoncurrent
COMMITMENTS AND CONTINGENCIES (Note 6)      
TOTAL $ 3,759,376us-gaap_LiabilitiesAndStockholdersEquity $ 3,667,818us-gaap_LiabilitiesAndStockholdersEquity