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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Pension benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | $ 12,061 | $ 11,418 | $ 34,590 | $ 34,210
Interest cost | 26,542 | 26,022 | 79,554 | 77,265
Expected return on plan assets | (35,993) | (35,238) | (107,957) | (105,630)
Amortization of net prior period gain | 0 | 0 | 0 | 0
Amortization of net actuarial (gain)/losses | 188 | 138 | 410 | 515
Net periodic pension/benefit cost (return) | 2,798 | 2,340 | 6,597 | 6,360
Impact of PUC D&Os | 17,406 | 17,663 | 53,585 | 53,929
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 20,204 | 20,003 | 60,182 | 60,289
Other benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 270 | 385 | 833 | 1,072
Interest cost | 1,808 | 2,075 | 5,542 | 6,389
Expected return on plan assets | (3,490) | (3,426) | (10,462) | (10,236)
Amortization of net prior period gain | 0 | (218) | 0 | (656)
Amortization of net actuarial (gain)/losses | (763) | (518) | (2,188) | (1,416)
Net periodic pension/benefit cost (return) | (2,175) | (1,702) | (6,275) | (4,847)
Impact of PUC D&Os | 2,052 | 1,536 | 5,827 | 4,385
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | (123) | (166) | (448) | (462)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 11,670 | 11,071 | 33,502 | 33,108
Interest cost | 24,615 | 24,116 | 73,869 | 71,513
Expected return on plan assets | (33,769) | (33,029) | (101,321) | (98,972)
Amortization of net prior period gain | 0 | 0 | 0 | 0
Amortization of net actuarial (gain)/losses | 51 | (16) | 74 | 21
Net periodic pension/benefit cost (return) | 2,567 | 2,142 | 6,124 | 5,670
Impact of PUC D&Os | 17,406 | 17,663 | 53,585 | 53,929
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 19,973 | 19,805 | 59,709 | 59,599
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 266 | 380 | 822 | 1,060
Interest cost | 1,721 | 1,981 | 5,279 | 6,107
Expected return on plan assets | (3,438) | (3,374) | (10,306) | (10,081)
Amortization of net prior period gain | 0 | (218) | 0 | (654)
Amortization of net actuarial (gain)/losses | (742) | (503) | (2,130) | (1,370)
Net periodic pension/benefit cost (return) | (2,193) | (1,734) | (6,335) | (4,938)
Impact of PUC D&Os | 2,052 | 1,536 | 5,827 | 4,385
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | $ (141) | $ (198) | $ (508) | $ (553)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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