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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Employee Benefit Plans Employee Benefit Plans
The components of net periodic benefit costs for Registrant’s pension plan, postretirement medical benefit plan and SERP for the three months ended March 31, 2025 and 2024 were as follows:
For The Three Months Ended March 31,
 Pension BenefitsOther
Postretirement
Benefits		SERP
(dollars in thousands)202520242025202420252024
Components of Net Periodic Benefits Cost:      
Service cost$774 $850 $27 $32 $181 $358 
Interest cost2,706 2,550 24 23 485 426 
Expected return on plan assets(3,183)(3,009)(161)(142)— — 
Amortization of prior service cost 108 108 — — — — 
Amortization of actuarial (gain) loss— — (291)(263)— (4)
Net periodic benefits costs under accounting standards405 499 (401)(350)666 780 
Total expense (benefit) recognized, before surcharges and allocation to overhead pool$405 $499 $(401)$(350)$666 $780 
In 2025, Registrant expects to contribute approximately $3.4 million to its pension plan.
As authorized by the CPUC in the water and electric general rate case decisions, GSWC and BVES each utilize two-way balancing accounts to track differences between the forecasted annual pension expenses in rates, or expected to be in rates, and the actual annual expense recorded in accordance with the accounting guidance for pension costs. During the three months ended March 31, 2025 and 2024, GSWC’s actual pension expense was lower than the amounts included in water customer rates by $0.3 million and $0.1 million, respectively. As of March 31, 2025, GSWC has a $0.8 million over-collection in its two-way balancing account, which is included as part of regulatory liabilities (Note 3).
BVES’s actual expense was lower than the amounts included in electric customer rates for all periods presented. As a result of receiving a final decision in its electric general rate case in the fourth quarter of 2024, BVES’s actual pension expense is nearly aligned with the amounts included in electric rates, resulting in an insignificant balance in their pension balancing account as of March 31, 2025.