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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2020
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 nine months ended September 30, 2020 and 2019 were as follows:
|  | For The Three Months Ended September 30,
|  | Pension Benefits |  | Other Postretirement Benefits |  | SERP
(dollars in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Components of Net Periodic Benefits Cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1,390 |  |  | $ | 1,110 |  |  | $ | 35 |  |  | $ | 53 |  |  | $ | 244 |  |  | $ | 298 |
Interest cost |  | 1,970 |  |  | 2,132 |  |  | 44 |  |  | 80 |  |  | 247 |  |  | 267 |
Expected return on plan assets |  | (2,950) |  |  | (2,594) |  |  | (130) |  |  | (112) |  |  | — |  |  | — |
Amortization of prior service cost |  | 109 |  |  | 109 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial (gain) loss |  | 484 |  |  | 355 |  |  | (334) |  |  | (150) |  |  | 211 |  |  | 118 |
Net periodic benefits costs under accounting standards |  | 1,003 |  |  | 1,112 |  |  | (385) |  |  | (129) |  |  | 702 |  |  | 683 |
Regulatory adjustment - deferred |  | (121) |  |  | (160) |  |  | — |  |  | — |  |  | — |  |  | — |
Total expense (benefit) recognized, before surcharges and allocation to overhead pool |  | $ | 882 |  |  | $ | 952 |  |  | $ | (385) |  |  | $ | (129) |  |  | $ | 702 |  |  | $ | 683 |
|  | For The Nine Months Ended September 30,
|  | Pension Benefits |  | Other Postretirement Benefits |  | SERP
(dollars in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Components of Net Periodic Benefits Cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 4,170 |  |  | $ | 3,330 |  |  | $ | 129 |  |  | $ | 159 |  |  | $ | 732 |  |  | $ | 894 |
Interest cost |  | 5,910 |  |  | 6,396 |  |  | 156 |  |  | 240 |  |  | 741 |  |  | 801 |
Expected return on plan assets |  | (8,850) |  |  | (7,782) |  |  | (384) |  |  | (336) |  |  | — |  |  | — |
Amortization of prior service cost |  | 327 |  |  | 327 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial (gain) loss |  | 1,452 |  |  | 1,065 |  |  | (732) |  |  | (450) |  |  | 633 |  |  | 354 |
Net periodic benefits costs under accounting standards |  | 3,009 |  |  | 3,336 |  |  | (831) |  |  | (387) |  |  | 2,106 |  |  | 2,049 |
Regulatory adjustment - deferred |  | (362) |  |  | (502) |  |  | — |  |  | — |  |  | — |  |  | — |
Total expense (benefit) recognized, before surcharges and allocation to overhead pool |  | $ | 2,647 |  |  | $ | 2,834 |  |  | $ | (831) |  |  | $ | (387) |  |  | $ | 2,106 |  |  | $ | 2,049 |
During the nine months ended September 30, 2020, Registrant contributed approximately $3.7 million to its pension plan. As authorized by the CPUC in the water and electric general rate case decisions, GSWC and BVESI utilize two-way balancing accounts for each of their ratemaking areas, as applicable, 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 and nine months ended September 30, 2020, GSWC's actual pension expense was higher than the amounts included in water customer rates by $121,000 and $362,000, respectively. During the three and nine ended September 30, 2019, GSWC's actual pension expense was higher than the amounts included in water customer rates by $160,000 and $502,000, respectively. BVESI's actual expense was lower than the amounts included in electric customer rates for all periods presented. As of September 30, 2020, GSWC and BVESI had net over-collections in the two-way pension balancing accounts of $1.1 million and $166,000, respectively, included as part of the regulatory assets and liabilities (Note 3).

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