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CONSOLIDATED STATEMENTS OF CAPITALIZATION (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Capitalization, Long-term Debt [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net $ (11,480)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet $ (11,301)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
Total long-term debt 3,890,229us-gaap_DebtAndCapitalLeaseObligations 3,872,643us-gaap_DebtAndCapitalLeaseObligations
Less current maturities 8,178us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 282,143us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term Debt and Capital Lease Obligations 3,882,051us-gaap_LongTermDebtAndCapitalLeaseObligations 3,590,500us-gaap_LongTermDebtAndCapitalLeaseObligations
Common Stockholder's Equity    
Common Stock — 100 shares authorized of $0.01 par value; 100 shares outstanding at Dec. 31, 2014 and 2013, respectively. 0us-gaap_CommonStockValue 0us-gaap_CommonStockValue
Additional paid in capital 3,522,788us-gaap_AdditionalPaidInCapitalCommonStock 3,441,290us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 1,386,929us-gaap_RetainedEarningsAccumulatedDeficit 1,384,047us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (23,878)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (23,338)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total common stockholder’s equity 4,885,839us-gaap_StockholdersEquity 4,801,999us-gaap_StockholdersEquity
First Mortgage Bonds | Series Due April 1, 2014    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueApril12014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 275,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueApril12014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds | Series Due Sept. 1, 2017    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 129,500us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept12017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 [1] 129,500us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept12017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 [1]
First Mortgage Bonds | Series Due Aug. 1, 2018    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueAug12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueAug12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds | Series Due June 1, 2019    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 400,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueJune12019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 400,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueJune12019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds | Series Due Nov. 15, 2020    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 400,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueNov152020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 400,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueNov152020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds | Series Due Sept. 15, 2022    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept152022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept152022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds | Series Due March 15, 2023    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 250,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueMarch152023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 250,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueMarch152023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds | Series Due Sept. 1, 2037    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 350,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept12037Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 350,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept12037Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds | Series Due Aug. 1, 2038    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueAug12038Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueAug12038Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds | Series Due Aug. 15, 2041    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 250,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueAug152041Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 250,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueAug152041Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds | Series Due Sept. 15, 2042    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 500,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept152042Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 500,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept152042Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds | Series Due March 15, 2043    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 250,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueMarch152043Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 250,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueMarch152043Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
First Mortgage Bonds | Series Due March 15, 2044    
Schedule of Capitalization, Long-term Debt [Line Items]    
Long-term debt, gross 300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueMarch152044Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember		 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueMarch152044Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Capital Lease Obligations    
Schedule of Capitalization, Long-term Debt [Line Items]    
Capital lease obligations $ 172,209us-gaap_CapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember		 $ 179,444us-gaap_CapitalLeaseObligations
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
[1] Pollution control financing.