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Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2022
GSWC  
Derivative instruments  
Schedule of changes in the fair value of the derivative The following table presents changes in the fair value of the Level 3 derivatives for the years 2022 and 2021:
(dollars in thousands)20222021
Fair value at beginning of the period$4,441 $(1,537)
Unrealized gain on purchased power contracts7,406 5,978 
Fair value at end of the period$11,847 $4,441