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Borrowings and Other Financing Instruments (Tables)
9 Months Ended
Sep. 30, 2018
Borrowings and Other Financing Instruments [Abstract]  
Credit Facilities
As of Sept. 30, 2018, SPS had the following committed credit facility available (in millions of dollars):

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

 
$
37

 
$
363


(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 Sept. 30, 2018
 
Year Ended Dec. 31, 2017
Borrowing limit
 
$
100

 
$
100

Amount outstanding at period end
 
23

 

Average amount outstanding
 
76

 
13

Maximum amount outstanding
 
100

 
100

Weighted average interest rate, computed on a daily basis
 
1.97
%
 
1.12
%
Weighted average interest rate at period end
 
1.99

 
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 Sept. 30, 2018
 
Year Ended Dec. 31, 2017
Borrowing limit
 
$
400

 
$
400

Amount outstanding at period end
 
35

 

Average amount outstanding
 
63

 
69

Maximum amount outstanding
 
144

 
176

Weighted average interest rate, computed on a daily basis
 
2.25
%
 
1.13
%
Weighted average interest rate at period end
 
2.35

 
N/A