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Retirement benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Defined Benefit Plan |  |  |  |  |
Contributions made to defined benefit plans |  |  | $ 23,000 | $ 17,000 |
Contributions expected to be paid in current year | $ 52,000 |  | 52,000 |  | $ 71,000
Expected payments for remainder of fiscal year | 3,000 |  | 3,000 |  | 2,000
Retirement benefits expense |  |  | $ 23,000 | 31,000 |
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 |  |  | $ 3,200 | 3,700 |
Cash contributions by the employer to defined contribution plan |  |  | 3,200 | 4,600 |
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 |  |  | 23,000 | 17,000 |
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 |  |  | 23,000 | 29,000 |
Defined contribution plan, expenses recognized |  |  | 1,500 | 1,400 |
Cash contributions by the employer to defined contribution plan |  |  | 1,500 | 1,400 |
Pension benefits |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 20,465 | $ 18,362 | 40,929 | 36,725 |
Interest cost | 18,800 | 20,164 | 37,601 | 40,327 |
Expected return on plan assets | (33,068) | (28,465) | (66,135) | (56,931) |
Amortization of net prior period (gain)/cost | 0 | 2 | 0 | 5 |
Amortization of net actuarial losses | 8,431 | 8,058 | 9,987 | 16,115 |
Net periodic pension/benefit cost (return) | 14,628 | 18,121 | 22,382 | 36,241 |
Impact of PUC D&Os | 5,513 | 6,261 | 16,680 | 12,523 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 20,141 | 24,382 | 39,062 | 48,764 |
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 19,993 | 17,891 | 39,987 | 35,782 |
Interest cost | 17,531 | 18,715 | 35,062 | 37,430 |
Expected return on plan assets | (31,367) | (26,857) | (62,735) | (53,712) |
Amortization of net prior period (gain)/cost | 0 | 3 | 0 | 5 |
Amortization of net actuarial losses | 8,212 | 7,369 | 10,771 | 14,737 |
Net periodic pension/benefit cost (return) | 14,369 | 17,121 | 23,085 | 34,242 |
Impact of PUC D&Os | 5,513 | 6,261 | 16,680 | 12,523 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 19,882 | 23,382 | 39,765 | 46,765 |
Other benefits |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 705 | 631 | 1,410 | 1,262 |
Interest cost | 1,569 | 1,856 | 3,138 | 3,711 |
Expected return on plan assets | (3,232) | (3,039) | (6,465) | (6,077) |
Amortization of net prior period (gain)/cost | (384) | (441) | (767) | (881) |
Amortization of net actuarial losses | 44 | 51 | 298 | 101 |
Net periodic pension/benefit cost (return) | (1,298) | (942) | (2,386) | (1,884) |
Impact of PUC D&Os | 1,176 | 777 | 2,146 | 1,554 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | (122) | (165) | (240) | (330) |
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 698 | 625 | 1,397 | 1,251 |
Interest cost | 1,504 | 1,781 | 3,008 | 3,563 |
Expected return on plan assets | (3,182) | (2,990) | (6,364) | (5,980) |
Amortization of net prior period (gain)/cost | (382) | (439) | (765) | (879) |
Amortization of net actuarial losses | 43 | 51 | 293 | 102 |
Net periodic pension/benefit cost (return) | (1,319) | (972) | (2,431) | (1,943) |
Impact of PUC D&Os | 1,176 | 777 | 2,146 | 1,554 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ (143) | $ (195) | $ (285) | $ (389) |

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