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Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2019
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, 2019 and 2018:
(dollars in thousands)
 
2019
 
2018
Balance, at beginning of the period
 
$
(311
)
 
$
(2,941
)
Unrealized (loss) gain on purchased power contracts
 
(2,860
)
 
2,630

Balance, at end of the period
 
$
(3,171
)
 
$
(311
)