Borrowings and Other Financing Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Borrowings and Other Financing Instruments [Abstract]

At Sept. 30, 2012, PSCo had the following committed credit facility available (in millions of dollars):

Credit Facility				Drawn (a)				Available
$	700.0			$	3.9			$	696.1

(a)	Includes outstanding commercial paper and letters of credit.

Commercial Paper [Member]

Borrowings and Other Financing Instruments [Abstract]

Short-Term Debt

Commercial Paper — PSCo meets its short-term liquidity requirements primarily through the issuance of commercial paper and borrowings under its credit facility. The following table presents commercial paper outstanding for PSCo:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2012			Twelve Months Ended Dec. 31, 2011
Borrowing limit	$	700		$	700
Amount outstanding at period end		-			-
Average amount outstanding		6			73
Maximum amount outstanding		46			304
Weighted average interest rate, computed on a daily basis		0.30	%		0.37	%
Weighted average interest rate at period end		N/A			N/A

Money Pool [Member]

Borrowings and Other Financing Instruments [Abstract]

Short-Term Debt

Money Pool — Xcel Energy Inc. and its utility subsidiaries have established a money pool arrangement that allows for short-term investments in and borrowings between the utility subsidiaries. Xcel Energy Inc. may make investments in the utility subsidiaries at market-based interest rates; however, the money pool arrangement does not allow the utility subsidiaries to make investments in Xcel Energy Inc. The following table presents the money pool borrowings for PSCo:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2012			Twelve Months Ended Dec. 31, 2011
Borrowing limit	$	250		$	250
Amount outstanding at period end		-			-
Average amount outstanding		1			3
Maximum amount outstanding		8			53
Weighted average interest rate, computed on a daily basis		0.32	%		0.35	%
Weighted average interest rate at period end		N/A			N/A