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Pension and other post-employment benefits | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Pension and other post-employment benefits | Pension and other post-employment benefits The following tables list the components of net benefit costs for the pension plans and other post-employment benefits ("OPEB") in the unaudited interim condensed consolidated statements of operations for the three and six months ended June 30:
| Pension benefits
| Three months ended June 30 |  | Six months ended June 30
| 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 2,969 |  |  | $ | 3,166 |  |  | $ | 6,053 |  |  | $ | 6,093 |
Non-service costs |  |  |  |  |  |  |
Interest cost | 8,061 |  |  | 7,906 |  |  | 16,494 |  |  | 16,299 |
Expected return on plan assets | (8,603) |  |  | (7,947) |  |  | (17,300) |  |  | (16,263) |
Amortization of net actuarial gains | (321) |  |  | (71) |  |  | (712) |  |  | (195) |
Amortization of prior service credits | (359) |  |  | (373) |  |  | (719) |  |  | (746) |
Impact of regulatory accounts | 4,384 |  |  | 4,588 |  |  | 8,755 |  |  | 8,683 |
| $ | 3,162 |  |  | $ | 4,103 |  |  | $ | 6,518 |  |  | $ | 7,778 |
Net benefit cost | $ | 6,131 |  |  | $ | 7,269 |  |  | $ | 12,571 |  |  | $ | 13,871 |
| OPEB
| Three months ended June 30 |  | Six months ended June 30
| 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 780 |  |  | $ | 902 |  |  | $ | 1,560 |  |  | $ | 1,891 |
Non-service costs |  |  |  |  |  |  |
Interest cost | 2,674 |  |  | 2,891 |  |  | 5,327 |  |  | 6,329 |
Expected return on plan assets | (2,644) |  |  | (2,331) |  |  | (5,288) |  |  | (5,077) |
Amortization of net actuarial gains | (867) |  |  | (561) |  |  | (2,466) |  |  | (1,122) |
Amortization of prior service credits | (213) |  |  | (213) |  |  | (426) |  |  | (426) |
Impact of regulatory accounts | 1,863 |  |  | 1,417 |  |  | 3,748 |  |  | 2,785 |
| $ | 813 |  |  | $ | 1,203 |  |  | $ | 895 |  |  | $ | 2,489 |
Net benefit cost | $ | 1,593 |  |  | $ | 2,105 |  |  | $ | 2,455 |  |  | $ | 4,380 |

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