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SCHEDULE I CONDENSED FINANCIAL INFORMATION OF PUGET ENERGY - Condensed Statements of Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]                      
Non-utility expense and other                 $ (13,109)psd_NonutilityExpenseAndOther $ 3,555psd_NonutilityExpenseAndOther $ (814)psd_NonutilityExpenseAndOther
Unhedged interest rate swap expense                 (3,915)psd_NonHedgedInterestRateDerivativeExpense 2,420psd_NonHedgedInterestRateDerivativeExpense (4,288)psd_NonHedgedInterestRateDerivativeExpense
Interest expense                 (367,308)us-gaap_InterestExpenseDebt (392,264)us-gaap_InterestExpenseDebt (392,216)us-gaap_InterestExpenseDebt
Income taxes                 (56,985)us-gaap_IncomeTaxExpenseBenefit (122,408)us-gaap_IncomeTaxExpenseBenefit (104,725)us-gaap_IncomeTaxExpenseBenefit
Net income (loss) 36,088us-gaap_NetIncomeLoss (12,958)us-gaap_NetIncomeLoss 41,113us-gaap_NetIncomeLoss 107,592us-gaap_NetIncomeLoss 108,808us-gaap_NetIncomeLoss 8,540us-gaap_NetIncomeLoss 905us-gaap_NetIncomeLoss 167,475us-gaap_NetIncomeLoss 171,835us-gaap_NetIncomeLoss 285,728us-gaap_NetIncomeLoss 273,821us-gaap_NetIncomeLoss
Comprehensive income (loss)                 87,077us-gaap_ComprehensiveIncomeNetOfTax 366,272us-gaap_ComprehensiveIncomeNetOfTax 271,899us-gaap_ComprehensiveIncomeNetOfTax
PUGET ENERGY                      
Condensed Financial Statements, Captions [Line Items]                      
Non-utility expense and other                 (5,390)psd_NonutilityExpenseAndOther
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,255)psd_NonutilityExpenseAndOther
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(2,040)psd_NonutilityExpenseAndOther
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Equity In Net Income (Loss) Of Subsidiaries                 240,102psd_EquityInNetIncomeLossOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
351,718psd_EquityInNetIncomeLossOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
365,590psd_EquityInNetIncomeLossOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Unhedged interest rate swap expense                 (3,915)psd_NonHedgedInterestRateDerivativeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,420psd_NonHedgedInterestRateDerivativeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(4,288)psd_NonHedgedInterestRateDerivativeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Interest income                 185us-gaap_InvestmentIncomeInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
114us-gaap_InvestmentIncomeInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
214us-gaap_InvestmentIncomeInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Interest expense                 (93,382)us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(103,372)us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(135,312)us-gaap_InterestExpenseDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income taxes                 34,235us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
36,103us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
49,657us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net income (loss)                 171,835us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
285,728us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
273,821us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Comprehensive income (loss)                 $ 87,077us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 366,272us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 271,899us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember