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Retirement benefits - Components of Net Periodic Benefit Cost for Consolidated HEI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Pension benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | $ 10,900 | $ 11,973 | $ 30,796 | $ 34,327
Interest cost | 27,999 | 25,478 | 80,608 | 76,376
Expected return on plan assets | (33,845) | (34,606) | (101,558) | (103,800)
Amortization of net actuarial (gain)/losses | 79 | 123 | 209 | 251
Net periodic pension/benefit cost (return) | 5,133 | 2,968 | 10,055 | 7,154
Impact of PUC D&Os | 15,200 | 17,406 | 50,799 | 53,585
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 20,333 | 20,374 | 60,854 | 60,739
Other benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 245 | 270 | 741 | 833
Interest cost | 1,819 | 1,803 | 5,461 | 5,525
Expected return on plan assets | (3,512) | (3,490) | (10,532) | (10,462)
Amortization of net actuarial (gain)/losses | (808) | (758) | (2,300) | (2,172)
Net periodic pension/benefit cost (return) | (2,256) | (2,175) | (6,630) | (6,276)
Impact of PUC D&Os | 2,138 | 2,052 | 6,187 | 5,827
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | (118) | (123) | (443) | (449)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 10,655 | 11,670 | 30,065 | 33,502
Interest cost | 27,101 | 24,615 | 77,960 | 73,869
Expected return on plan assets | (33,041) | (33,769) | (99,142) | (101,321)
Amortization of net actuarial (gain)/losses | 34 | 51 | 81 | 74
Net periodic pension/benefit cost (return) | 4,749 | 2,567 | 8,964 | 6,124
Impact of PUC D&Os | 15,200 | 17,406 | 50,799 | 53,585
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 19,949 | 19,973 | 59,763 | 59,709
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 242 | 266 | 732 | 822
Interest cost | 1,731 | 1,721 | 5,212 | 5,279
Expected return on plan assets | (3,464) | (3,438) | (10,387) | (10,306)
Amortization of net actuarial (gain)/losses | (811) | (742) | (2,285) | (2,130)
Net periodic pension/benefit cost (return) | (2,302) | (2,193) | (6,728) | (6,335)
Impact of PUC D&Os | 2,138 | 2,052 | 6,187 | 5,827
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | $ (164) | $ (141) | $ (541) | $ (508)

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