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Retirement benefits - Components of Net Periodic Benefit Cost for Consolidated HEI (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Pension benefits |  |
Defined Benefit Plan |  |
Service cost | $ 9,948 | $ 11,176
Interest cost | 26,305 | 25,449
Expected return on plan assets | (33,857) | (34,596)
Amortization of net actuarial (gain)/losses | 65 | 64
Net periodic pension/benefit cost (return) | 2,461 | 2,093
Impact of PUC D&Os | 17,799 | 18,090
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 20,260 | 20,183
Other benefits |  |
Defined Benefit Plan |  |
Service cost | 248 | 281
Interest cost | 1,821 | 1,861
Expected return on plan assets | (3,510) | (3,485)
Amortization of net actuarial (gain)/losses | (746) | (708)
Net periodic pension/benefit cost (return) | (2,187) | (2,051)
Impact of PUC D&Os | 2,025 | 1,888
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | (162) | (163)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits |  |
Defined Benefit Plan |  |
Service cost | 9,705 | 10,916
Interest cost | 25,429 | 24,627
Expected return on plan assets | (33,049) | (33,777)
Amortization of net actuarial (gain)/losses | 23 | 12
Net periodic pension/benefit cost (return) | 2,108 | 1,778
Impact of PUC D&Os | 17,799 | 18,090
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 19,907 | 19,868
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits |  |
Defined Benefit Plan |  |
Service cost | 245 | 278
Interest cost | 1,741 | 1,779
Expected return on plan assets | (3,462) | (3,434)
Amortization of net actuarial (gain)/losses | (737) | (694)
Net periodic pension/benefit cost (return) | (2,213) | (2,071)
Impact of PUC D&Os | 2,025 | 1,888
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | $ (188) | $ (183)

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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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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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)(3) -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)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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