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Borrowings and Other Financing Instruments
9 Months Ended
Sep. 30, 2015
Debt Disclosure [Abstract]  
Borrowings and Other Financing Instruments
Borrowings and Other Financing Instruments

Short-Term Borrowings

Money Pool — Xcel Energy Inc. and its utility subsidiaries have established a money pool arrangement that allows for short-term investments in and borrowings between the utility subsidiaries. Xcel Energy Inc. may make investments in the utility subsidiaries at market-based interest rates; however, the money pool arrangement does not allow the utility subsidiaries to make investments in Xcel Energy Inc. Money pool borrowings for PSCo were as follows:
(Amounts in Millions, Except Interest Rates)
 
Three Months Ended Sept. 30, 2015
 
Twelve Months Ended Dec. 31, 2014
Borrowing limit
 
$
250

 
$
250

Amount outstanding at period end
 

 

Average amount outstanding
 

 
4

Maximum amount outstanding
 
8

 
97

Weighted average interest rate, computed on a daily basis
 
N/A

 
0.25
%
Weighted average interest rate at period end
 
N/A

 
N/A



Commercial Paper — PSCo meets its short-term liquidity requirements primarily through the issuance of commercial paper and borrowings under its credit facility. Commercial paper outstanding for PSCo was as follows:
(Amounts in Millions, Except Interest Rates)
 
Three Months Ended Sept. 30, 2015
 
Twelve Months Ended Dec. 31, 2014
Borrowing limit
 
$
700

 
$
700

Amount outstanding at period end
 

 
382

Average amount outstanding
 
8

 
167

Maximum amount outstanding
 
67

 
393

Weighted average interest rate, computed on a daily basis
 
0.43
%
 
0.31
%
Weighted average interest rate at period end
 
N/A

 
0.65



Letters of Credit PSCo uses letters of credit, generally with terms of one year, to provide financial guarantees for certain operating obligations. At Sept. 30, 2015 and Dec. 31, 2014, there were $5 million and $6 million, respectively, of letters of credit outstanding under the credit facility. The contract amounts of these letters of credit approximate their fair value and are subject to fees.

Credit Facility — In order to use its commercial paper program to fulfill short-term funding needs, PSCo must have a revolving credit facility in place at least equal to the amount of its commercial paper borrowing limit and cannot issue commercial paper in an aggregate amount exceeding available capacity under this credit facility. The line of credit provides short-term financing in the form of notes payable to banks, letters of credit and back-up support for commercial paper borrowings.

At Sept. 30, 2015, PSCo had the following committed credit facility available (in millions of dollars):
Credit Facility (a)
 
Drawn (b)
 
Available
$
700

 
$
5

 
$
695


(a)    This credit facility expires in October 2019.
(b)    Includes outstanding commercial paper and letters of credit.

All credit facility bank borrowings, outstanding letters of credit and outstanding commercial paper reduce the available capacity under the credit facility. PSCo had no direct advances on the credit facility outstanding at Sept. 30, 2015 and Dec. 31, 2014.

Long-Term Borrowings

In May 2015, PSCo issued $250 million of 2.9 percent first mortgage bonds due May 15, 2025.