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Retirement benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Defined Benefit Plan |  |  |  |  |
Expected payments for remainder of fiscal year | $ 2,000 |  | $ 2,000 |  | $ 2,000
Retirement benefits expense |  |  | $ 46,000 | $ 44,000 |
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 |  |  | $ 5,500 | 5,100 |
Cash contributions by the employer to defined contribution plan |  |  | 6,000 | 6,000 |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Expected payments for remainder of fiscal year | 1,000 |  | 1,000 |  | 1,000
Retirement benefits expense |  |  | 43,000 | 43,000 |
Defined contribution plan, expenses recognized |  |  | 2,100 | 1,900 |
Cash contributions by the employer to defined contribution plan |  |  | 2,100 | 1,900 |
Pension benefits |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Contributions made to defined benefit plans |  |  | 53,000 | 36,000 |
Contributions expected to be paid in current year | 71,000 |  | 71,000 |  | 49,000
Service cost | 18,341 | $ 15,800 | 55,066 | 46,564 |
Interest cost | 20,660 | 21,150 | 60,987 | 63,216 |
Expected return on plan assets | (28,422) | (27,991) | (85,353) | (83,988) |
Amortization of net prior period (gain)/cost | 2 | (10) | 7 | (32) |
Amortization of net actuarial (gains)/losses | 8,944 | 3,989 | 25,059 | 11,667 |
Net periodic pension/benefit cost (return) | 19,525 | 12,938 | 55,766 | 37,427 |
Impact of PUC D&Os | 4,976 | 11,554 | 17,499 | 36,111 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 24,501 | 24,492 | 73,265 | 73,538 |
Pension benefits | American Savings Bank (ASB) |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Contributions expected to be paid in current year | 0 |  | 0 |  | 0
Pension benefits | Hawaiian Electric Industries, Inc. |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Contributions expected to be paid in current year | 1,000 |  | 1,000 |  | 1,000
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Contributions made to defined benefit plans |  |  | 52,000 | 36,000 |
Contributions expected to be paid in current year | 70,000 |  | 70,000 |  | $ 48,000
Service cost | 17,921 | 15,344 | 53,703 | 45,346 |
Interest cost | 19,183 | 19,560 | 56,613 | 58,388 |
Expected return on plan assets | (26,815) | (26,146) | (80,527) | (78,474) |
Amortization of net prior period (gain)/cost | 1 | 2 | 6 | 6 |
Amortization of net actuarial (gains)/losses | 8,188 | 3,841 | 22,925 | 10,993 |
Net periodic pension/benefit cost (return) | 18,478 | 12,601 | 52,720 | 36,259 |
Impact of PUC D&Os | 4,976 | 11,554 | 17,499 | 36,111 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 23,454 | 24,155 | 70,219 | 72,370 |
Other benefits |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 641 | 573 | 1,903 | 1,656 |
Interest cost | 1,842 | 2,006 | 5,553 | 6,000 |
Expected return on plan assets | (3,023) | (3,101) | (9,100) | (9,273) |
Amortization of net prior period (gain)/cost | (474) | (451) | (1,355) | (1,355) |
Amortization of net actuarial (gains)/losses | 53 | (3) | 154 | (10) |
Net periodic pension/benefit cost (return) | (961) | (976) | (2,845) | (2,982) |
Impact of PUC D&Os | 835 | 821 | 2,389 | 2,443 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | (126) | (155) | (456) | (539) |
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 635 | 568 | 1,886 | 1,643 |
Interest cost | 1,764 | 1,920 | 5,327 | 5,755 |
Expected return on plan assets | (2,986) | (3,064) | (8,966) | (9,135) |
Amortization of net prior period (gain)/cost | (474) | (451) | (1,353) | (1,353) |
Amortization of net actuarial (gains)/losses | 53 | 0 | 155 | 0 |
Net periodic pension/benefit cost (return) | (1,008) | (1,027) | (2,951) | (3,090) |
Impact of PUC D&Os | 835 | 821 | 2,389 | 2,443 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ (173) | $ (206) | $ (562) | $ (647) |

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