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Retirement benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Defined Benefit Plan |  |  |  |  |
Contributions made to defined benefit plans |  |  | $ 39,000 | $ 53,000 |
Contributions expected to be paid in current year | $ 52,000 |  | 52,000 |  | $ 71,000
Expected payments for remainder of fiscal year | 2,000 |  | 2,000 |  | 2,000
Retirement benefits expense |  |  | $ 35,000 | 46,000 |
Number of years for which regulatory asset/liability for each utility will be amortized, beginning with respective utility's next rate case (in years) |  |  | 5 years |  |
Defined contribution plan, expenses recognized |  |  | $ 4,900 | 5,500 |
Cash contributions by the employer to defined contribution plan |  |  | 4,800 | 6,000 |
Pension benefits |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 20,102 | $ 18,341 | 61,031 | 55,066 |
Interest cost | 18,896 | 20,660 | 56,497 | 60,987 |
Expected return on plan assets | (33,022) | (28,422) | (99,157) | (85,353) |
Amortization of net prior period (gain)/cost | 0 | 2 | 0 | 7 |
Amortization of net actuarial (gain) losses | 10,112 | 8,944 | 20,099 | 25,059 |
Net periodic pension/benefit cost (return) | 16,088 | 19,525 | 38,470 | 55,766 |
Impact of PUC D&Os | 4,292 | 4,976 | 20,972 | 17,499 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 20,380 | 24,501 | 59,442 | 73,265 |
Other benefits |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 711 | 641 | 2,121 | 1,903 |
Interest cost | 1,459 | 1,842 | 4,597 | 5,553 |
Expected return on plan assets | (3,252) | (3,023) | (9,717) | (9,100) |
Amortization of net prior period (gain)/cost | (383) | (474) | (1,150) | (1,355) |
Amortization of net actuarial (gain) losses | (140) | 53 | 158 | 154 |
Net periodic pension/benefit cost (return) | (1,605) | (961) | (3,991) | (2,845) |
Impact of PUC D&Os | 1,483 | 835 | 3,629 | 2,389 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | (122) | (126) | (362) | (456) |
American Savings Bank (ASB) |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Contributions expected to be paid in current year | 0 |  | 0 |  | 0
Hawaiian Electric Industries, Inc. |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Contributions expected to be paid in current year | 1,000 |  | 1,000 |  | 1,000
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Contributions made to defined benefit plans |  |  | 38,000 | 52,000 |
Contributions expected to be paid in current year | 51,000 |  | 51,000 |  | 70,000
Expected payments for remainder of fiscal year | 1,000 |  | 1,000 |  | $ 1,000
Retirement benefits expense |  |  | 35,000 | 43,000 |
Defined contribution plan, expenses recognized |  |  | 2,300 | 2,100 |
Cash contributions by the employer to defined contribution plan |  |  | 2,300 | 2,100 |
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 19,610 | 17,921 | 59,597 | 53,703 |
Interest cost | 17,614 | 19,183 | 52,676 | 56,613 |
Expected return on plan assets | (31,318) | (26,815) | (94,053) | (80,527) |
Amortization of net prior period (gain)/cost | 0 | 1 | 0 | 6 |
Amortization of net actuarial (gain) losses | 9,880 | 8,188 | 20,651 | 22,925 |
Net periodic pension/benefit cost (return) | 15,786 | 18,478 | 38,871 | 52,720 |
Impact of PUC D&Os | 4,292 | 4,976 | 20,972 | 17,499 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 20,078 | 23,454 | 59,843 | 70,219 |
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 704 | 635 | 2,101 | 1,886 |
Interest cost | 1,398 | 1,764 | 4,406 | 5,327 |
Expected return on plan assets | (3,202) | (2,986) | (9,566) | (8,966) |
Amortization of net prior period (gain)/cost | (383) | (474) | (1,148) | (1,353) |
Amortization of net actuarial (gain) losses | (138) | 53 | 155 | 155 |
Net periodic pension/benefit cost (return) | (1,621) | (1,008) | (4,052) | (2,951) |
Impact of PUC D&Os | 1,483 | 835 | 3,629 | 2,389 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ (138) | $ (173) | $ (423) | $ (562) |

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