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Retirement benefits - Components of Net Periodic Benefit Cost for Consolidated HEI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Pension benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | $ 9,948 | $ 11,178 | $ 19,896 | $ 22,354
Interest cost | 26,304 | 25,449 | 52,609 | 50,898
Expected return on plan assets | (33,856) | (34,598) | (67,713) | (69,194)
Amortization of net actuarial (gain)/losses | 65 | 64 | 130 | 128
Net periodic pension/benefit cost (return) | 2,461 | 2,093 | 4,922 | 4,186
Impact of PUC D&Os | 17,800 | 18,089 | 35,599 | 36,179
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 20,261 | 20,182 | 40,521 | 40,365
Other benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 248 | 282 | 496 | 563
Interest cost | 1,821 | 1,861 | 3,642 | 3,722
Expected return on plan assets | (3,510) | (3,487) | (7,020) | (6,972)
Amortization of net actuarial (gain)/losses | (746) | (706) | (1,492) | (1,414)
Net periodic pension/benefit cost (return) | (2,187) | (2,050) | (4,374) | (4,101)
Impact of PUC D&Os | 2,024 | 1,887 | 4,049 | 3,775
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | (163) | (163) | (325) | (326)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 9,705 | 10,916 | 19,410 | 21,832
Interest cost | 25,430 | 24,627 | 50,859 | 49,254
Expected return on plan assets | (33,052) | (33,775) | (66,101) | (67,552)
Amortization of net actuarial (gain)/losses | 24 | 11 | 47 | 23
Net periodic pension/benefit cost (return) | 2,107 | 1,779 | 4,215 | 3,557
Impact of PUC D&Os | 17,800 | 18,089 | 35,599 | 36,179
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 19,907 | 19,868 | 39,814 | 39,736
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 245 | 278 | 490 | 556
Interest cost | 1,740 | 1,779 | 3,481 | 3,558
Expected return on plan assets | (3,461) | (3,434) | (6,923) | (6,868)
Amortization of net actuarial (gain)/losses | (737) | (694) | (1,474) | (1,388)
Net periodic pension/benefit cost (return) | (2,213) | (2,071) | (4,426) | (4,142)
Impact of PUC D&Os | 2,024 | 1,887 | 4,049 | 3,775
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | $ (189) | $ (184) | $ (377) | $ (367)

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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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