Borrowings and Other Financing Instruments (Tables)

6 Months Ended

Jun. 30, 2021

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

As of June 30, 2021, NSP-Wisconsin had the following committed revolving credit facility available (in millions of dollars):

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

(a)Expires in June 2024.

(b)Includes outstanding commercial paper.

Money Pool

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Money pool borrowings for NSP-Wisconsin:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2021			Year Ended Dec. 31, 2020
Borrowing limit	$	150		$	—
Amount outstanding at period end	33			—
Average amount outstanding	20			—
Maximum amount outstanding	41			—
Weighted average interest rate, computed on a daily basis	0.04		%	N/A
Weighted average interest rate at period end	0.02			N/A

Commercial Paper

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Commercial paper outstanding for NSP-Wisconsin:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2021		Year Ended Dec. 31, 2020
Borrowing limit	$	150	$	150
Amount outstanding at period end	—		19
Average amount outstanding	—		30
Maximum amount outstanding	—		95
Weighted average interest rate, computed on a daily basis	N/A		1.59		%
Weighted average interest rate at period end	N/A		0.17