Borrowings and Other Financing Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Borrowings and Other Financing Instruments [Abstract]

Committed Credit Facility Available

At Dec. 31, 2013, NSP-Wisconsin had the following committed credit facility available (in millions of dollars):

Credit Facility (a)		Drawn(b)		Available
$	150.0	$	68.0	$	82.0

^(a)  Credit facility expires in July 2017.

^(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, 2013
Borrowing limit	$	150
Amount outstanding at period end	68
Average amount outstanding	41
Maximum amount outstanding	71
Weighted average interest rate, computed on a daily basis	0.30		%
Weighted average interest rate at period end	0.27

(Amounts in Millions, Except Interest Rates)	Twelve Months Ended Dec. 31, 2013			Twelve Months Ended Dec. 31, 2012			Twelve Months Ended Dec. 31, 2011
Borrowing limit	$	150		$	150		$	150
Amount outstanding at period end	68			39			66
Average amount outstanding	20			61			24
Maximum amount outstanding	71			116			70
Weighted average interest rate, computed on a daily basis	0.31		%	0.39		%	0.37		%
Weighted average interest rate at period end	0.27			0.40			0.46

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, 2013			Dec. 31, 2012
Notes payable to affiliates	$	0.5		$	0.6
Weighted average interest rate	0.24		%	0.33		%