Borrowings and Other Financing Instruments (Tables)

3 Months Ended

Mar. 31, 2023

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

As of March 31, 2023, SPS had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Drawn (b)		Available
$	500	$	80	$	420

(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 March 31, 2023			Year Ended Dec. 31, 2022
Borrowing limit	$	100		$	100
Amount outstanding at period end	5			—
Average amount outstanding	—			35
Maximum amount outstanding	5			100
Weighted average interest rate, computed on a daily basis	4.59		%	0.44		%
Weighted average interest rate at period end	4.59			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 March 31, 2023			Year Ended Dec. 31, 2022
Borrowing limit	$	500		$	500
Amount outstanding at period end	78			34
Average amount outstanding	88			100
Maximum amount outstanding	118			324
Weighted average interest rate, computed on a daily basis	4.86		%	0.79		%
Weighted average interest rate at period end	5.58			4.55