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Borrowings and Other Financing Instruments (Tables)
3 Months Ended
Mar. 31, 2016
Borrowings and Other Financing Instruments [Abstract]  
Credit Facilities
At March 31, 2016, SPS had the following committed credit facility available (in millions of dollars):
Credit Facility (a)
 
Drawn (b)
 
Available
$
400

 
$
87

 
$
313


(a) 
This credit facility expires in October 2019.
(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 March 31, 2016
 
Twelve Months Ended Dec. 31, 2015
Borrowing limit
 
$
100

 
$
100

Amount outstanding at period end
 

 

Average amount outstanding
 
11

 
21

Maximum amount outstanding
 
88

 
100

Weighted average interest rate, computed on a daily basis
 
0.71
%
 
0.40
%
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 March 31, 2016
 
Twelve Months Ended Dec. 31, 2015
Borrowing limit
 
$
400

 
$
400

Amount outstanding at period end
 
80

 
15

Average amount outstanding
 
58

 
100

Maximum amount outstanding
 
93

 
246

Weighted average interest rate, computed on a daily basis
 
0.65
%
 
0.46
%
Weighted average interest rate at period end
 
0.70

 
0.60