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Borrowings and Other Financing Instruments (Tables)
6 Months Ended
Jun. 30, 2017
Borrowings and Other Financing Instruments [Abstract]  
Credit Facilities
At June 30, 2017, SPS had the following committed credit facility available (in millions of dollars):

Credit Facility (a)
 
Drawn (b)
 
Available
$
400

 
$
109

 
$
291


(a) 
This credit facility expires in June 2021.
(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, 2017
 
Year Ended Dec. 31, 2016
Borrowing limit
 
$
100

 
$
100

Amount outstanding at period end
 
61

 

Average amount outstanding
 
11

 
28

Maximum amount outstanding
 
99

 
100

Weighted average interest rate, computed on a daily basis
 
1.21
%
 
0.67
%
Weighted average interest rate at period end
 
1.22

 
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 June 30, 2017
 
Year Ended Dec. 31, 2016
Borrowing limit
 
$
400

 
$
400

Amount outstanding at period end
 
106

 
50

Average amount outstanding
 
134

 
43

Maximum amount outstanding
 
176

 
140

Weighted average interest rate, computed on a daily basis
 
1.20
%
 
0.67
%
Weighted average interest rate at period end
 
1.37

 
0.95