Borrowings and Other Financing Instruments (Tables)

9 Months Ended

Sep. 30, 2023

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

As of Sept. 30, 2023, 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 September 2027.

(b)Includes outstanding letters of credit.

Money Pool

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Money pool borrowings:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2023			Year Ended Dec. 31, 2022
Borrowing limit	$	100		$	100
Amount outstanding at period end	—			—
Average amount outstanding	73			35
Maximum amount outstanding	100			100
Weighted average interest rate, computed on a daily basis	5.19		%	0.44		%
Weighted average interest rate at period end	N/A			N/A

Commercial Paper

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Commercial paper outstanding:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2023			Year Ended Dec. 31, 2022
Borrowing limit	$	500		$	500
Amount outstanding at period end	—			34
Average amount outstanding	47			100
Maximum amount outstanding	119			324
Weighted average interest rate, computed on a daily basis	5.35		%	0.79		%
Weighted average interest rate at period end	N/A			4.55