Borrowings and Other Financing Instruments (Tables)

12 Months Ended

Dec. 31, 2017

At Dec. 31, 2017, SPS had the following committed credit facility available (in millions):


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


^(b)	Includes letters of credit.

Money pool borrowings for SPS were as follows:



(Amounts in Millions, Except Interest Rates)	Twelve Months Ended Dec. 31, 2017			Twelve Months Ended Dec. 31, 2016			Twelve Months Ended Dec. 31, 2015
Borrowing limit	$	100		$	100		$	100
Amount outstanding at period end	—			—			—
Average amount outstanding	13			28			21
Maximum amount outstanding	100			100			100
Weighted average interest rate, computed on a daily basis	1.12		%	0.67		%	0.40		%
Weighted average interest rate at end of period	N/A			N/A			N/A

Commercial paper outstanding for SPS was as follows:



(Amounts in Millions, Except Interest Rates)	Twelve Months Ended Dec. 31, 2017			Twelve Months Ended Dec. 31, 2016			Twelve Months Ended Dec. 31, 2015
Borrowing limit	$	400		$	400		$	400
Amount outstanding at period end	—			50			15
Average amount outstanding	69			43			100
Maximum amount outstanding	176			140			246
Weighted average interest rate, computed on a daily basis	1.13		%	0.67		%	0.46		%
Weighted average interest rate at end of period	NA			0.95			0.60