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Regulatory Matters (Tables)
 9 Months Ended
Sep. 30, 2025
Regulated Operations [Abstract]  
Schedule of regulatory assets, less regulatory liabilities in the consolidated balance sheets for continuing operations
Regulatory assets, less regulatory liabilities, included in the consolidated balance sheets are as follows:
(dollars in thousands)September 30,
2025		December 31,
2024
GSWC
2025 general rate case memorandum account (unbilled revenue)
$2,614 $— 
2022/2023 general rate case memorandum accounts (unbilled revenue)25,864 37,711 
Water revenue adjustment mechanism, net of modified cost balancing account12,752 29,738 
Asset retirement obligations7,981 7,501 
Flowed-through deferred income taxes, net18,668 12,506 
Low income rate assistance balancing accounts10,063 8,834 
Other regulatory assets10,377 11,352 
Excess deferred income taxes(63,464)(63,682)
Pensions and other post-retirement obligations (24,578)(25,179)
Per-and Polyfluoroalkyl Substances (“PFAS”) Contamination Litigation Proceeds Memorandum Account
(12,393)— 
Other regulatory liabilities(1,758)(608)
Total GSWC$(13,874)$18,173 
BVES
Derivative instrument memorandum account (Note 5)$14,275 $8,823 
2023/2024 general rate case memorandum accounts (unbilled revenue)8,949 9,777 
Wildfire mitigation and other fire prevention related costs memorandum accounts13,030 14,681 
Other regulatory assets11,293 8,853 
Other regulatory liabilities(4,489)(5,628)
Total BVES$43,058 $36,506 
Total AWR$29,184 $54,679