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, SPS had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Drawn (b)		Available
$	500	$	2	$	498

(a)Expires in June 2024.

(b)Includes outstanding letters of credit.

Money Pool

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Money pool borrowings for SPS:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2021			Year Ended Dec. 31, 2020
Borrowing limit	$	100		$	100
Amount outstanding at period end	63			—
Average amount outstanding	6			43
Maximum amount outstanding	94			100
Weighted average interest rate, computed on a daily basis	0.02		%	0.54		%
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 SPS:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2021		Year Ended Dec. 31, 2020
Borrowing limit	$	500	$	500
Amount outstanding at period end	—		250
Average amount outstanding	—		44
Maximum amount outstanding	—		250
Weighted average interest rate, computed on a daily basis	N/A		1.11		%
Weighted average interest rate at period end	N/A		0.29