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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2021
GOLDEN STATE WATER COMPANY  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative Instruments
The following table presents changes in the fair value of the Level 3 derivatives for the three and six months ended June 30, 2021 and 2020. The change in fair value was due to an increase in energy prices during the three and six months ended June 30, 2021.
 For The Three Months Ended 
 June 30,
 For The Six Months Ended 
 June 30,
(dollars in thousands)2021202020212020
Fair value at beginning of the period$1,224 $(4,280)$(1,537)$(3,171)
Unrealized gains (losses) on purchased power contracts1,586 453 4,347 (656)
Fair value at end of the period$2,810 $(3,827)$2,810 $(3,827)