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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 and 2016:
(dollars in thousands)
 
2017
 
2016
Balance, at beginning of the period
 
$
(4,901
)
 
$
(7,053
)
Unrealized gain on purchased power contracts
 
1,960

 
2,152

Balance, at end of the period
 
$
(2,941
)
 
$
(4,901
)