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Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2015
GSWC  
Derivative instruments  
Schedule of changes in the fair value of the derivative
The following table presents changes in the fair value of GSWC’s derivatives for the years ended December 31, 2015 and 2014:
(dollars in thousands)
 
2015
 
2014
Balance, at beginning of the period
 
$
(3,339
)
 
$

Unrealized loss on purchased power contracts
 
(3,714
)
 
(3,339
)
Balance, at end of the period
 
$
(7,053
)
 
$
(3,339
)