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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2026
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 and six months ended June 30, 2026 and 2025 were as follows:
For The Three Months Ended June 30,
Pension BenefitsOther
Postretirement
Benefits		SERP
(dollars in thousands)202620252026202520262025
Components of Net Periodic Benefits Cost:
Service cost$730 $668 $25 $27 $202 $180 
Interest cost2,750 2,676 18 21 506 485 
Expected return on plan assets(3,552)(3,179)(179)(161)— — 
Amortization of prior service cost108 110 — — — — 
Amortization of actuarial (gain) loss(429)— (71)(292)— — 
Net periodic benefits costs under accounting standards$(393)$275 $(207)$(405)$708 $665 
For The Six Months Ended June 30,
Pension BenefitsOther
Postretirement
Benefits		SERP
(dollars in thousands)202620252026202520262025
Components of Net Periodic Benefits Cost:
Service cost$1,482 $1,442 $52 $54 $404 $361 
Interest cost5,463 5,382 37 45 1,012 970 
Expected return on plan assets(7,106)(6,362)(358)(322)— — 
Amortization of prior service cost217 218 — — — — 
Amortization of actuarial (gain) loss(910)— (142)(583)— — 
Net periodic benefits costs under accounting standards$(854)$680 $(411)$(806)$1,416 $1,331 
Registrant does not expect to contribute to its pension plan in 2026 given its current funded status. Registrant’s policy is to fund the plans annually at a level which is deductible for income tax purposes and is consistent with amounts recovered in customer rates while also complying with ERISA’s funding requirements.
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 June 30, 2026 and 2025, GSWC’s actual pension expense was lower than the amounts included in water customer rates by $0.9 million and $0.4 million, respectively, and $1.8 million and $0.8 million during the six months ended June 30, 2026 and 2025, respectively. As of June 30, 2026, GSWC has a $3.9 million over-collection in its two-way balancing account, which is included as part of regulatory liabilities in Registrant’s balance sheets (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 approximates the amounts included in electric rates, resulting in an insignificant balance in its pension balancing account as of June 30, 2026.