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Accounting for Derivative Instruments and Hedging Activities (Schedule of Contractual Contingent Liability Positions) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Electric Portfolio  
Derivative [Line Items]  
Fair Value Liability $ (106,356)us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember		 [1]
Collateral Already Posted, Aggregate Fair Value 0us-gaap_CollateralAlreadyPostedAggregateFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember
Contingent Collateral 37,398us-gaap_AdditionalCollateralAggregateFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember
Credit Rating | Electric Portfolio  
Derivative [Line Items]  
Fair Value Liability (37,398)us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_CreditRatingMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember		 [1],[2]
Collateral Already Posted, Aggregate Fair Value 0us-gaap_CollateralAlreadyPostedAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_CreditRatingMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember		 [2]
Contingent Collateral 37,398us-gaap_AdditionalCollateralAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_CreditRatingMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember		 [2]
Credit Rating | Natural Gas Portfolio  
Derivative [Line Items]  
Collateral Already Posted, Aggregate Fair Value 1,000us-gaap_CollateralAlreadyPostedAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_CreditRatingMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_NaturalGasPortfolioMember
Requested Credit for Adequate Assurance | Electric Portfolio  
Derivative [Line Items]  
Fair Value Liability (66,468)us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_RequestedCreditForAdequateAssuranceMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember		 [1]
Collateral Already Posted, Aggregate Fair Value 0us-gaap_CollateralAlreadyPostedAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_RequestedCreditForAdequateAssuranceMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember
Contingent Collateral 0us-gaap_AdditionalCollateralAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_RequestedCreditForAdequateAssuranceMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember
Forward Value of Contract | Electric Portfolio  
Derivative [Line Items]  
Fair Value Liability (2,490)us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_ForwardValueOfContractMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember		 [1],[3]
Collateral Already Posted, Aggregate Fair Value 0us-gaap_CollateralAlreadyPostedAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_ForwardValueOfContractMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember		 [3]
Contingent Collateral $ 0us-gaap_AdditionalCollateralAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_ForwardValueOfContractMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember		 [3]
[1] Represents the derivative fair value of contracts with contingent features for counterparties in net derivative liability positions. Excludes NPNS, accounts payable and accounts receivable.
[2] Failure by PSE to maintain an investment grade credit rating from each of the major credit rating agencies provides counterparties a contractual right to demand collateral.
[3] Collateral requirements may vary, based on changes in the forward value of underlying transactions relative to contractually defined collateral thresholds.