Borrowings and Other Financing Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Borrowings and Other Financing Instruments [Abstract]

At March 31, 2013, PSCo had the following committed credit facility available (in millions of dollars):

Credit Facility (a)				Drawn (b)				Available
$	700.0			$	4.0			$	696.0

(a)	Credit facility expires in July 2017.

(b)	Includes outstanding letters of credit.

Money Pool [Member]

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

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. Money pool borrowings for PSCo were as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended March 31, 2013			Twelve Months Ended Dec. 31, 2012
Borrowing limit	$	250		$	250
Amount outstanding at period end		-			-
Average amount outstanding		1			0.3
Maximum amount outstanding		12			8
Weighted average interest rate, computed on a daily basis		0.36	%		0.33	%
Weighted average interest rate at period end		N/A			N/A

Commercial Paper [Member]

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Commercial Paper — PSCo meets its short-term liquidity requirements primarily through the issuance of commercial paper and borrowings under its credit facility. Commercial paper outstanding for PSCo was as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended March 31, 2013			Twelve Months Ended Dec. 31, 2012
Borrowing limit	$	700		$	700
Amount outstanding at period end		-			154
Average amount outstanding		154			8
Maximum amount outstanding		332			165
Weighted average interest rate, computed on a daily basis		0.34	%		0.33	%
Weighted average interest rate at period end		N/A			0.35