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Retirement benefits (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Defined Benefit Plan |  |  |
Contributions made to defined benefit plans | $ 9,000 | $ 17,000 |
Contributions expected to be paid in current year | 52,000 |  | $ 71,000
Expected payments for remainder of fiscal year | 3,000 |  | 2,000
Retirement benefits expense | $ 11,000 | 15,000 |
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 | $ 1,700 | 1,800 |
Cash contributions by the employer to defined contribution plan | 1,800 | 3,200 |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Cash contributions by the employer to defined contribution plan | 1,800 | 3,200 |
American Savings Bank (ASB) |  |  |
Defined Benefit Plan |  |  |
Contributions expected to be paid in current year | 0 |  | 0
Hawaiian Electric Industries, Inc. |  |  |
Defined Benefit Plan |  |  |
Contributions expected to be paid in current year | 1,000 |  | 1,000
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined Benefit Plan |  |  |
Contributions made to defined benefit plans | 9,000 | 17,000 |
Contributions expected to be paid in current year | 51,000 |  | 70,000
Expected payments for remainder of fiscal year | 1,000 |  | $ 1,000
Retirement benefits expense | 12,000 | 14,000 |
Defined contribution plan, expenses recognized | 800 | 700 |
Cash contributions by the employer to defined contribution plan | 800 | 700 |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Cash contributions by the employer to defined contribution plan | 800 | 700 |
Pension benefits |  |  |
Defined Benefit Plan |  |  |
Service cost | 20,464 | 18,363 |
Interest cost | 18,801 | 20,163 |
Expected return on plan assets | (33,067) | (28,466) |
Amortization of net prior period (gain)/cost | 0 | 3 |
Amortization of net actuarial losses1 | 1,556 | 8,057 |
Net periodic pension/benefit cost (return) | 7,754 | 18,120 |
Impact of PUC D&Os | 11,167 | 6,262 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 18,921 | 24,382 |
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined Benefit Plan |  |  |
Service cost | 19,994 | 17,891 |
Interest cost | 17,531 | 18,715 |
Expected return on plan assets | (31,368) | (26,855) |
Amortization of net prior period (gain)/cost | 0 | 2 |
Amortization of net actuarial losses1 | 2,559 | 7,368 |
Net periodic pension/benefit cost (return) | 8,716 | 17,121 |
Impact of PUC D&Os | 11,167 | 6,262 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 19,883 | 23,383 |
Other benefits |  |  |
Defined Benefit Plan |  |  |
Service cost | 705 | 631 |
Interest cost | 1,569 | 1,855 |
Expected return on plan assets | (3,233) | (3,038) |
Amortization of net prior period (gain)/cost | (383) | (440) |
Amortization of net actuarial losses1 | 254 | 50 |
Net periodic pension/benefit cost (return) | (1,088) | (942) |
Impact of PUC D&Os | 970 | 777 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | (118) | (165) |
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined Benefit Plan |  |  |
Service cost | 699 | 626 |
Interest cost | 1,504 | 1,782 |
Expected return on plan assets | (3,182) | (2,990) |
Amortization of net prior period (gain)/cost | (383) | (440) |
Amortization of net actuarial losses1 | 250 | 51 |
Net periodic pension/benefit cost (return) | (1,112) | (971) |
Impact of PUC D&Os | 970 | 777 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ (142) | $ (194) |

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