Borrowings and Other Financing Instruments (Tables)

6 Months Ended

Jun. 30, 2014

Borrowings and Other Financing Instruments [Abstract]

Committed Credit Facility Available

At June 30, 2014, SPS had the following committed credit facility available (in millions):

Credit Facility (a)		Drawn(b)		Available
$	300.0	$	140.0	$	160.0

^(a)  Credit facility expires in July 2017.

^(b)  Includes outstanding commercial paper and 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 June 30, 2014			Twelve Months Ended Dec. 31, 2013
Borrowing limit	$	100		$	100
Amount outstanding at period end	—			38
Average amount outstanding	6			46
Maximum amount outstanding	54			100
Weighted average interest rate, computed on a daily basis	0.23		%	0.15		%
Weighted average interest rate at period end	N/A			0.25

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 June 30, 2014			Twelve Months Ended Dec. 31, 2013
Borrowing limit	$	300		$	300
Amount outstanding at period end	99			84
Average amount outstanding	165			32
Maximum amount outstanding	241			140
Weighted average interest rate, computed on a daily basis	0.25		%	0.30		%
Weighted average interest rate at period end	0.27			0.27