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Retirement benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Defined Benefit Plan |  |  |  |  |
Expected payments for remainder of fiscal year | $ 3,000 |  | $ 3,000 |  | $ 2,000
Retirement benefits expense |  |  | $ 31,000 | $ 29,000 |
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 |  |  | $ 3,700 | 3,600 |
Cash contributions by the employer to defined contribution plan |  |  | 4,600 | 4,900 |
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 |  |  | 29,000 | 29,000 |
Defined contribution plan, expenses recognized |  |  | 1,400 | 1,300 |
Cash contributions by the employer to defined contribution plan |  |  | 1,400 | 1,300 |
Pension benefits |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Contributions made to defined benefit plans |  |  | 17,000 | 24,000 |
Contributions expected to be paid in current year | 71,000 |  | 71,000 |  | 49,000
Service cost | 18,362 | $ 15,382 | 36,725 | 30,764 |
Interest cost | 20,164 | 21,033 | 40,327 | 42,066 |
Expected return on plan assets | (28,465) | (27,999) | (56,931) | (55,997) |
Amortization of net prior period (gain)/cost | 2 | (11) | 5 | (22) |
Amortization of net actuarial (gains)/losses | 8,058 | 3,839 | 16,115 | 7,678 |
Net periodic pension/benefit cost (return) | 18,121 | 12,244 | 36,241 | 24,489 |
Impact of PUC D&Os | 6,261 | 12,278 | 12,523 | 24,557 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 24,382 | 24,522 | 48,764 | 49,046 |
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 |  |  | 17,000 | 23,000 |
Contributions expected to be paid in current year | 70,000 |  | 70,000 |  | $ 48,000
Service cost | 17,891 | 15,001 | 35,782 | 30,002 |
Interest cost | 18,715 | 19,414 | 37,430 | 38,828 |
Expected return on plan assets | (26,857) | (26,164) | (53,712) | (52,328) |
Amortization of net prior period (gain)/cost | 3 | 2 | 5 | 4 |
Amortization of net actuarial (gains)/losses | 7,369 | 3,576 | 14,737 | 7,152 |
Net periodic pension/benefit cost (return) | 17,121 | 11,829 | 34,242 | 23,658 |
Impact of PUC D&Os | 6,261 | 12,278 | 12,523 | 24,557 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 23,382 | 24,107 | 46,765 | 48,215 |
Other benefits |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 631 | 542 | 1,262 | 1,083 |
Interest cost | 1,856 | 1,997 | 3,711 | 3,994 |
Expected return on plan assets | (3,039) | (3,086) | (6,077) | (6,172) |
Amortization of net prior period (gain)/cost | (441) | (452) | (881) | (904) |
Amortization of net actuarial (gains)/losses | 51 | (4) | 101 | (7) |
Net periodic pension/benefit cost (return) | (942) | (1,003) | (1,884) | (2,006) |
Impact of PUC D&Os | 777 | 811 | 1,554 | 1,622 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | (165) | (192) | (330) | (384) |
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Defined Benefit Plan |  |  |  |  |
Service cost | 625 | 538 | 1,251 | 1,075 |
Interest cost | 1,781 | 1,918 | 3,563 | 3,835 |
Expected return on plan assets | (2,990) | (3,036) | (5,980) | (6,071) |
Amortization of net prior period (gain)/cost | (439) | (451) | (879) | (902) |
Amortization of net actuarial (gains)/losses | 51 | 0 | 102 | 0 |
Net periodic pension/benefit cost (return) | (972) | (1,031) | (1,943) | (2,063) |
Impact of PUC D&Os | 777 | 811 | 1,554 | 1,622 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | $ (195) | $ (220) | $ (389) | $ (441) |

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