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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating activities    
Net income $ 110,966us-gaap_NetIncomeLoss $ 118,403us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 101,172us-gaap_DepreciationAmortizationAndAccretionNet 94,654us-gaap_DepreciationAmortizationAndAccretionNet
Demand side management program amortization 1,022us-gaap_AmortizationOfRegulatoryAsset 1,144us-gaap_AmortizationOfRegulatoryAsset
Deferred income taxes 37,771us-gaap_DeferredIncomeTaxExpenseBenefit 41,863us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of investment tax credits (733)us-gaap_InvestmentTaxCredit (734)us-gaap_InvestmentTaxCredit
Allowance for equity funds used during construction (2,806)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity (11,430)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Net realized and unrealized hedging and derivative transactions 5,086psco_GainLossOnHedgingAndDerivativeTransactions 2,818psco_GainLossOnHedgingAndDerivativeTransactions
Changes in operating assets and liabilities:    
Accounts receivable 35,312us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables 410us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Accrued unbilled revenues 89,193us-gaap_IncreaseDecreaseInUnbilledReceivables 63,760us-gaap_IncreaseDecreaseInUnbilledReceivables
Inventories 43,638us-gaap_IncreaseDecreaseInInventories 56,296us-gaap_IncreaseDecreaseInInventories
Prepayments and other 89,210us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 7,395us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (61,624)us-gaap_IncreaseDecreaseInAccountsPayable (29,270)us-gaap_IncreaseDecreaseInAccountsPayable
Net regulatory assets and liabilities 73,340us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities 10,199us-gaap_IncreaseDecreaseInRegulatoryAssetsAndLiabilities
Other current liabilities 43,420us-gaap_IncreaseDecreaseInOtherCurrentLiabilities 38,157us-gaap_IncreaseDecreaseInOtherCurrentLiabilities
Pension and other employee benefit obligations (20,496)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (35,614)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Change in other noncurrent assets 903us-gaap_IncreaseDecreaseInOtherNoncurrentAssets 4,616us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Change in other noncurrent liabilities (3,734)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities (891)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net cash provided by operating activities 541,640us-gaap_NetCashProvidedByUsedInOperatingActivities 361,776us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities    
Utility capital/construction expenditures (241,194)us-gaap_PaymentsToAcquireProductiveAssets (299,086)us-gaap_PaymentsToAcquireProductiveAssets
Allowance for equity funds used during construction 2,806us-gaap_AllowanceForFundsUsedDuringConstructionInvestingActivities 11,430us-gaap_AllowanceForFundsUsedDuringConstructionInvestingActivities
Investments in utility money pool arrangement (57,000)psco_InvestmentsInUtilityMoneyPoolArrangement (495,000)psco_InvestmentsInUtilityMoneyPoolArrangement
Repayments from utility money pool arrangement 73,000psco_RepaymentsFromUtilityMoneyPoolArrangement 317,000psco_RepaymentsFromUtilityMoneyPoolArrangement
Net cash used in investing activities (222,388)us-gaap_NetCashProvidedByUsedInInvestingActivities (465,656)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities    
Repayments of short-term borrowings, net (240,000)us-gaap_ProceedsFromRepaymentsOfShortTermDebt 0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Borrowings under utility money pool arrangement 9,000psco_BorrowingsUnderUtilityMoneyPoolArrangement 2,000psco_BorrowingsUnderUtilityMoneyPoolArrangement
Repayments under utility money pool arrangement (9,000)psco_RepaymentsUnderUtilityMoneyPoolArrangement (2,000)psco_RepaymentsUnderUtilityMoneyPoolArrangement
Proceeds from issuance of long-term debt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 296,045us-gaap_ProceedsFromIssuanceOfLongTermDebt
Dividends paid to parent (83,794)us-gaap_PaymentsOfDividendsCommonStock (195,134)us-gaap_PaymentsOfDividendsCommonStock
Net cash (used in) provided by financing activities (323,794)us-gaap_NetCashProvidedByUsedInFinancingActivities 100,911us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents (4,542)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (2,969)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 7,635us-gaap_CashAndCashEquivalentsAtCarryingValue 21,089us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 3,093us-gaap_CashAndCashEquivalentsAtCarryingValue 18,120us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:    
Cash paid for interest (net of amounts capitalized) (64,940)us-gaap_InterestPaidNet (55,003)us-gaap_InterestPaidNet
Cash received for income taxes, net 87,443us-gaap_IncomeTaxesPaidNet 4,902us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash investing transactions:    
Property, plant and equipment additions in accounts payable $ 65,289us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 93,872us-gaap_CapitalExpendituresIncurredButNotYetPaid