Borrowings and Other Financing Instruments (Tables)

12 Months Ended

Dec. 31, 2014

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

At Dec. 31, 2014, NSP-Wisconsin had the following committed credit facility available (in millions):

Credit Facility (a)		Drawn(b)		Available
$	150.0	$	78.0	$	72.0

^(a)  These credit facilities have been amended to extend the maturity to October 2019.

^(b)  Includes outstanding commercial paper.

Commercial Paper

Borrowings and Other Financing Instruments [Abstract]

Short-term Borrowings

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

(Amounts in Millions, Except Interest Rates)	Three Months Ended Dec. 31, 2014
Borrowing limit	$	150
Amount outstanding at period end	78
Average amount outstanding	34
Maximum amount outstanding	80
Weighted average interest rate, computed on a daily basis	0.37		%
Weighted average interest rate at period end	0.55

(Amounts in Millions, Except Interest Rates)	Twelve Months Ended Dec. 31, 2014			Twelve Months Ended Dec. 31, 2013			Twelve Months Ended Dec. 31, 2012
Borrowing limit	$	150		$	150		$	150
Amount outstanding at period end	78			68			39
Average amount outstanding	46			20			61
Maximum amount outstanding	101			71			116
Weighted average interest rate, computed on a daily basis	0.27		%	0.31		%	0.39		%
Weighted average interest rate at period end	0.55			0.27			0.40

Notes Payable, Other Payables

Borrowings and Other Financing Instruments [Abstract]

Short-term Borrowings

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)	Dec. 31, 2014			Dec. 31, 2013
Notes payable to affiliates	$	0.5		$	0.5
Weighted average interest rate	0.51		%	0.24		%