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Borrowings and Other Financing Instruments (Tables)
9 Months Ended
Sep. 30, 2014
Borrowings and Other Financing Instruments [Abstract]  
Credit Facilities
At Sept. 30, 2014, PSCo had the following committed credit facility available (in millions of dollars):
Credit Facility (a)
 
Drawn (b)
 
Available
$
700.0

 
$
259.5

 
$
440.5


(a) 
Credit facility has been amended to expire 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 PSCo were as follows:
(Amounts in Millions, Except Interest Rates)
 
Three Months Ended Sept. 30, 2014
 
Twelve Months Ended Dec. 31, 2013
Borrowing limit
 
$
250

 
$
250

Amount outstanding at period end
 
11

 

Average amount outstanding
 
10

 
0.1

Maximum amount outstanding
 
97

 
12

Weighted average interest rate, computed on a daily basis
 
0.25
%
 
0.36
%
Weighted average interest rate at period end
 
0.24

 
N/A

Commercial Paper
 
Borrowings and Other Financing Instruments [Abstract]  
Short-Term Borrowings
Commercial paper outstanding for PSCo was as follows:
(Amounts in Millions, Except Interest Rates)
 
Three Months Ended Sept. 30, 2014
 
Twelve Months Ended Dec. 31, 2013
Borrowing limit
 
$
700

 
$
700

Amount outstanding at period end
 
253

 

Average amount outstanding
 
225

 
38

Maximum amount outstanding
 
315

 
332

Weighted average interest rate, computed on a daily basis
 
0.28
%
 
0.34
%
Weighted average interest rate at period end
 
0.28

 
N/A