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SHORT TERM CREDIT ARRANGEMENTS (Tables)
 9 Months Ended
Sep. 30, 2011
SHORT TERM CREDIT ARRANGEMENTS (Tables) [Abstract]  
Short-term borrowings table
Information with respect to short-term borrowings is set forth below:

   
2011
  
2010
  
2009
 
   
($ In Thousands)
 
UIL Holdings
         
           
Maximum aggregate principal amount of short-term borrowing outstanding at any month-end
 $46,000  $5,000  $6,900 
Average aggregate short-term borrowings outstanding during the year*
 $20,310  $1,699  $2,298 
Weighted average interest rate*
  2.02%  0.65%  3.26%
Principal amounts outstanding at year-end
 $35,000  $-  $- 
Annualized interest rate on principal amounts outstanding at year-end
  1.59%  N/A   N/A 
Fees*
 $224  $115  $58 
              
UI
            
              
Maximum aggregate principal amount of short-term borrowing outstanding at any month-end
 $200,000  $25,000  $174,000 
Average aggregate short-term borrowings outstanding during the year*
 $82,690  $10,778  $65,526 
Weighted average interest rate*
  1.91%  0.67%  0.88%
Principal amounts outstanding at year-end
 $200,000  $-  $- 
Annualized interest rate on principal amounts outstanding at year-end
  1.39%  N/A   0.00%
Fees*
 $559  $273  $513 
              
Gas Companies **
            
              
Maximum aggregate principal amount of short-term borrowing outstanding at any month-end
 $10,000  $7,000   N/A 
Average aggregate short-term borrowings outstanding during the year*
 $1,222  $6,067   N/A 
Weighted average interest rate*
  1.80%  0.26%  N/A 
Principal amounts outstanding at year-end
 $-  $7,000   N/A 
Annualized interest rate on principal amounts outstanding at year-end
  N/A   1.75%  N/A 
Fees*
 $783  $75   N/A 
 
*
Average short-term borrowings represent the sum of daily borrowings outstanding, weighted for the number of days outstanding and divided by the number of days in the period.  The weighted average interest rate is determined by dividing interest expense by the amount of average borrowings.  Fees are excluded from the calculation of the weighted average interest rate.
**
Gas Company information for 2010 relates to the 45-day period ending December 31, 2010.