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Borrowings and Other Financing Instruments (Tables)
9 Months Ended
Sep. 30, 2015
Borrowings and Other Financing Instruments [Abstract]  
Credit Facilities
At Sept. 30, 2015, SPS had the following committed credit facility available (in millions of dollars):
Credit Facility (a)
 
Drawn (b)
 
Available
$
400

 
$
10

 
$
390


(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 Sept. 30, 2015
 
Twelve Months Ended Dec. 31, 2014
Borrowing limit
 
$
100

 
$
100

Amount outstanding at period end
 
18

 
16

Average amount outstanding
 
47

 
9

Maximum amount outstanding
 
100

 
100

Weighted average interest rate, computed on a daily basis
 
0.41
%
 
0.22
%
Weighted average interest rate at period end
 
0.38

 
0.45

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, 2015
 
Twelve Months Ended Dec. 31, 2014
Borrowing limit
 
$
400

 
$
400

Amount outstanding at period end
 

 
37

Average amount outstanding
 
135

 
83

Maximum amount outstanding
 
246

 
241

Weighted average interest rate, computed on a daily basis
 
0.45
%
 
0.26
%
Weighted average interest rate at period end
 
N/A

 
0.47