Borrowings and Other Financing Instruments (Tables)

6 Months Ended

Jun. 30, 2024

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

As of June 30, 2024, SPS had the following committed revolving credit facility available (in millions of dollars):

Credit Facility (a)		Drawn (b)		Available
$	500	$	—	$	500

(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 June 30, 2024			Year Ended Dec. 31, 2023
Borrowing limit	$	100		$	100
Amount outstanding at period end	—			27
Average amount outstanding	48			46
Maximum amount outstanding	100			100
Weighted average interest rate, computed on a daily basis	5.33		%	5.04		%
Weighted average interest rate at period end	N/A			5.34

Commercial Paper

Borrowings and Other Financing Instruments [Abstract]

Short-Term Borrowings

Commercial paper outstanding:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2024			Year Ended Dec. 31, 2023
Borrowing limit	$	500		$	500
Amount outstanding at period end	—			75
Average amount outstanding	51			50
Maximum amount outstanding	160			119
Weighted average interest rate, computed on a daily basis	5.59		%	5.12		%
Weighted average interest rate at period end	N/A			5.56