Borrowings and Other Financing Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Borrowings and Other Financing Instruments [Abstract]

As of March 31, 2019, SPS had the following committed credit facility available (in millions of dollars):



Credit Facility ^(a)		Outstanding ^(b)		Available
$	400	$	139	$	261


^(a)	This credit facility expires in June 2021.


^(b)	Includes outstanding commercial paper and letters of credit.

All credit facility bank borrowings, outstanding letters of credit and outstanding commercial paper reduce the available capacity under the credit facility. SPS had no direct advances on the credit facility outstanding as of March 31, 2019 and Dec. 31, 2018.

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 March 31, 2019			Year Ended Dec. 31, 2018
Borrowing limit	$	100		$	100
Amount outstanding at period end	38			—
Average amount outstanding	19			29
Maximum amount outstanding	100			100
Weighted average interest rate, computed on a daily basis	2.44		%	1.96		%
Weighted average interest rate at period end	2.44			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 March 31, 2019			Year Ended Dec. 31, 2018
Borrowing limit	$	400		$	400
Amount outstanding at period end	137			42
Average amount outstanding	86			30
Maximum amount outstanding	152			144
Weighted average interest rate, computed on a daily basis	2.69		%	2.27		%
Weighted average interest rate at period end	2.71			2.80