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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2023
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 2023 and 2022:
(dollars in thousands)20232022
Fair value at beginning of the period$11,847 $4,441 
Unrealized (losses) gains on purchase power contracts
(14,207)7,406 
Fair value at end of the period$(2,360)$11,847