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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2021
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, 2021 and 2020 were as follows:
|  | For The Three Months Ended June 30,
|  | Pension Benefits |  | Other Postretirement Benefits |  | SERP
(dollars in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Components of Net Periodic Benefits Cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1,625 |  |  | $ | 1,372 |  |  | $ | 40 |  |  | $ | 47 |  |  | $ | 348 |  |  | $ | 244 |
Interest cost |  | 1,712 |  |  | 1,986 |  |  | 31 |  |  | 56 |  |  | 229 |  |  | 247 |
Expected return on plan assets |  | (3,134) |  |  | (2,950) |  |  | (134) |  |  | (127) |  |  | — |  |  | — |
Amortization of prior service cost |  | 109 |  |  | 109 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial (gain) loss |  | 993 |  |  | 526 |  |  | (287) |  |  | (199) |  |  | 419 |  |  | 211 |
Net periodic benefits costs under accounting standards |  | 1,305 |  |  | 1,043 |  |  | (350) |  |  | (223) |  |  | 996 |  |  | 702 |
Regulatory adjustment - deferred |  | (351) |  |  | (148) |  |  | — |  |  | — |  |  | — |  |  | — |
Total expense (benefit) recognized, before surcharges and allocation to overhead pool |  | $ | 954 |  |  | $ | 895 |  |  | $ | (350) |  |  | $ | (223) |  |  | $ | 996 |  |  | $ | 702 |
|  | For The Six Months Ended June 30,
|  | Pension Benefits |  | Other Postretirement Benefits |  | SERP
(dollars in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Components of Net Periodic Benefits Cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 3,250 |  |  | $ | 2,780 |  |  | $ | 80 |  |  | $ | 94 |  |  | $ | 696 |  |  | $ | 488 |
Interest cost |  | 3,424 |  |  | 3,940 |  |  | 62 |  |  | 112 |  |  | 458 |  |  | 494 |
Expected return on plan assets |  | (6,268) |  |  | (5,900) |  |  | (268) |  |  | (254) |  |  | — |  |  | — |
Amortization of prior service cost |  | 218 |  |  | 218 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial (gain) loss |  | 1,986 |  |  | 968 |  |  | (574) |  |  | (398) |  |  | 838 |  |  | 422 |
Net periodic benefits costs under accounting standards |  | 2,610 |  |  | 2,006 |  |  | (700) |  |  | (446) |  |  | 1,992 |  |  | 1,404 |
Regulatory adjustment - deferred |  | (702) |  |  | (241) |  |  | — |  |  | — |  |  | — |  |  | — |
Total expense (benefit) recognized, before surcharges and allocation to overhead pool |  | $ | 1,908 |  |  | $ | 1,765 |  |  | $ | (700) |  |  | $ | (446) |  |  | $ | 1,992 |  |  | $ | 1,404 |
In September 2021, Registrant expects to contribute approximately $3.5 million to its pension plan. As authorized by the CPUC in the water and electric general rate case decisions, GSWC and BVESI 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, 2021 and 2020, GSWC's actual pension expense was higher than the amounts included in water customer rates by $351,000 and $148,000, respectively. During the six months ended June 30, 2021 and 2020, GSWC's actual pension expense was higher than the amounts included in water customer rates by $702,000 and $241,000, respectively. BVESI's actual expense was lower than the amounts included in electric customer rates for all periods presented. As of June 30, 2021, GSWC and BVESI had over-collections in their two-way pension balancing accounts of $315,000 and $102,000, respectively, included as part of regulatory assets and liabilities (Note 3).

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