Borrowings and Other Financing Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

At Dec. 31, 2015, NSP-Wisconsin had the following committed credit facility available (in millions):

Credit Facility (a)		Drawn(b)		Available
$	150	$	10	$	140

^(a)  This credit facility matures in 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, 2015
Borrowing limit	$	150
Amount outstanding at period end	10
Average amount outstanding	6
Maximum amount outstanding	18
Weighted average interest rate, computed on a daily basis	0.44		%
Weighted average interest rate at period end	0.70

(Amounts in Millions, Except Interest Rates)	Twelve Months Ended Dec. 31, 2015			Twelve Months Ended Dec. 31, 2014			Twelve Months Ended Dec. 31, 2013
Borrowing limit	$	150		$	150		$	150
Amount outstanding at period end	10			78			68
Average amount outstanding	39			46			20
Maximum amount outstanding	122			101			71
Weighted average interest rate, computed on a daily basis	0.44		%	0.27		%	0.31		%
Weighted average interest rate at period end	0.70			0.55			0.27

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, 2015			Dec. 31, 2014
Notes payable to affiliates	$	0.5		$	0.5
Weighted average interest rate	0.87		%	0.51		%