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, NSP-Wisconsin had the following committed credit facility available (in millions of dollars):

Credit Facility		Drawn (a)		Available
$	150.0	$	99.0	$	51.0

(a) Includes outstanding commercial paper.

Commercial Paper [Member]

Borrowings and Other Financing Instruments [Abstract]

Short-Term Debt

Commercial Paper — NSP-Wisconsin 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 NSP-Wisconsin:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2012			Twelve Months Ended Dec. 31, 2011
Borrowing limit	$	150		$	150
Amount outstandingat period end		99			66
Average amount outstanding		88			24
Maximum amount outstanding		116			70
Weighted average interest rate, computed on a daily basis		0.38	%		0.37	%
Weighted average interest rate at period end		0.38			0.46

Notes Payable [Member]

Borrowings and Other Financing Instruments [Abstract]

Short-Term Debt

Other Short-Term Borrowings — The following table presents the notes payable of Clearwater Investments, Inc., a NSP-Wisconsin subsidiary, to Xcel Energy Inc.:

(Amounts in Millions, Except Interest Rates)	Sept. 30, 2012			Dec. 31, 2011
Notes payable to affiliates	$	0.6		$	0.5
Weighted average interest rate		0.33	%		0.46	%