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Borrowings and Other Financing Instruments
3 Months Ended
Mar. 31, 2012
Borrowings and Other Financing Instruments [Abstract]  
Borrowings and Other Financing Instruments
6.      Borrowings and Other Financing Instruments
 
Commercial Paper - NSP-Wisconsin meets its short-term liquidity requirements primarily through the issuance of commercial paper and borrowings under its credit facility.  The following table presents commercial paper outstanding for NSP-Wisconsin:
 
(Amounts in Millions, Except Interest Rates)
 
Three Months Ended
March 31, 2012
   
Twelve Months Ended
Dec. 31, 2011
 
Borrowing limit
 
$
        150
   
$
150
 
Amount outstanding at period end
   
              71
     
66
 
Average amount outstanding
   
      65
     
24
 
Maximum amount outstanding
   
      89
     
70
 
Weighted average interest rate, computed on a daily basis
   
   0.40
%
 
0.37
%
Weighted average interest rate at period end
   
 0.41
     
0.46
 

Credit Facility - In order to use its commercial paper program to fulfill short-term funding needs, NSP-Wisconsin 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 agreement.  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 March 31, 2012, NSP-Wisconsin had the following committed credit facility available (in millions of dollars):

 
Credit Facility
 
Drawn (a)
  
Available
 
$150.0 $71.0  $79.0 
 
(a)
Includes outstanding commercial paper.

All credit facility bank borrowings, outstanding letters of credit and outstanding commercial paper reduce the available capacity under the credit facility.  NSP-Wisconsin had no direct advances on the credit facility outstanding at March 31, 2012 and Dec. 31, 2011.

Letters of Credit - NSP-Wisconsin may use letters of credit, generally with terms of one-year, to provide financial guarantees for certain operating obligations.  At March 31, 2012 and Dec. 31, 2011, there were no letters of credit outstanding.
 
Other Short-Term Borrowings- The following table presents the notes payable of Clearwater Investments, Inc., a NSP-Wisconsin subsidiary, to Xcel Energy:

(Amounts in Millions, Except Interest Rates)
 
March 31, 2012
   
Dec. 31, 2011
 
Notes payable to affiliates
 
$
                          0.6
   
$
                          0.5
 
Weighted average interest rate
   
                        0.41
%
 
                        0.46
%