Borrowings and Other Financing Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

As of Sept. 30, 2018, NSP-Wisconsin had the following committed credit facility available (in millions of dollars):

Credit Facility (a)		Drawn(b)		Available
$	150	$	—	$	150

^(a)  This credit facility expires in June 2021.

^(b)  Includes outstanding commercial paper.

Commercial Paper

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Commercial paper outstanding for NSP-Wisconsin was as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2018			Year Ended Dec. 31, 2017
Borrowing limit	$	150		$	150
Amount outstanding at period end	—			11
Average amount outstanding	24			52
Maximum amount outstanding	48			129
Weighted average interest rate, computed on a daily basis	2.22		%	1.23		%
Weighted average interest rate at period end	N/A			1.73

Notes Payable To Affiliates

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)	Sept. 30, 2018			Dec. 31, 2017
Notes payable to affiliates	$	0.5		$	0.5
Weighted average interest rate at period end	2.61		%	1.73		%