Borrowings and Other Financing Instruments (Tables)

9 Months Ended

Sep. 30, 2019

Borrowings and Other Financing Instruments [Abstract]

Credit Facilities

As of Sept. 30, 2019, SPS had the following committed credit facility available (in millions of dollars):

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

^(a)  This credit facility 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, 2019		Year Ended Dec. 31, 2018
Borrowing limit	$	100	$	100
Amount outstanding at period end	—		—
Average amount outstanding	—		29
Maximum amount outstanding	—		100
Weighted average interest rate, computed on a daily basis	N/A		1.96		%
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 for SPS was as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended Sept. 30, 2019		Year Ended Dec. 31, 2018
Borrowing limit	$	500	$	400
Amount outstanding at period end	—		42
Average amount outstanding	—		30
Maximum amount outstanding	—		144
Weighted average interest rate, computed on a daily basis	N/A		2.27		%
Weighted average interest rate at period end	N/A		2.80