Borrowings and Other Financing Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Borrowings and Other Financing Instruments [Abstract]

Committed Credit Facility Available

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

Credit Facility		Drawn		Available
$	300.0	$	-	$	300.0

Commercial Paper [Member]

Borrowings and Other Financing Instruments [Abstract]

Short-Term Debt

Commercial Paper — SPS 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 SPS:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2012			Twelve Months Ended Dec. 31, 2011
Borrowing limit	$	300		$	300
Amount outstandingat period end		-			-
Average amount outstanding		-			54
Maximum amount outstanding		16			161
Weighted average interest rate, computed on a daily basis		0.33	%		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 utility 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 SPS:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2012			Twelve Months Ended Dec. 31, 2011
Borrowing limit	$	100		$	100
Amount outstandingat period end		-			5
Average amount outstanding		-			12
Maximum amount outstanding		9			71
Weighted average interest rate, computed on a daily basis		0.33	%		0.35	%
Weighted average interest rate at period end		N/A			0.35