Borrowings and Other Financing Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

As of Sept. 30, 2020, 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 were as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2020			Year Ended Dec. 31, 2019
Borrowing limit	$	100		$	100
Amount outstanding at period end	10			—
Average amount outstanding	—			8
Maximum amount outstanding	10			100
Weighted average interest rate, computed on a daily basis	0.09		%	2.42		%
Weighted average interest rate at period end	0.90			N/A

Commercial Paper

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Commercial paper outstanding for SPS was as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2020		Year Ended Dec. 31, 2019
Borrowing limit	$	500	$	500
Amount outstanding at period end	—		—
Average amount outstanding	—		72
Maximum amount outstanding	—		316
Weighted average interest rate, computed on a daily basis	N/A		2.68		%
Weighted average interest rate at period end	N/A		N/A