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Capitalization (Tables)
6 Months Ended
Jun. 30, 2012
Capitalization Tables  
Carrying amount and estimated fair value

 

   (Thousands of Dollars) 
   June 30, 2012   December 31, 2011 
   Carrying   Fair   Carrying   Fair 
   Amount   Value   Amount   Value 
First Mortgage Bonds  $90,208   $91,370   $86,577   $87,283 
SRF Bonds  $785   $790   $793   $799