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Derivative Instruments (Tables) | 12 Months Ended
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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 | )

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