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Derivative Instruments (Tables) (GSWC)
12 Months Ended
Dec. 31, 2014
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, 2014 and 2013.
(dollars in thousands)
 
2014
 
2013
Balance, at beginning of the period
 
$

 
$
(3,060
)
Unrealized gain (loss) on purchased power contracts
 
(3,339
)
 
3,060

Balance, at end of the period
 
$
(3,339
)
 
$