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Retirement benefits - Components of Net Periodic Benefit Cost for Consolidated HEI (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Pension benefits |  |
Defined Benefit Plan |  |
Service cost | $ 11,264 | $ 11,396
Interest cost | 26,506 | 25,621
Expected return on plan assets | (35,982) | (35,195)
Amortization of net prior period gain | 0 | 0
Amortization of net actuarial (gain) losses | 111 | 188
Net periodic pension/benefit cost (return) | 1,899 | 2,010
Impact of PUC D&Os | 18,090 | 18,133
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 19,989 | 20,143
Other benefits |  |
Defined Benefit Plan |  |
Service cost | 281 | 344
Interest cost | 1,867 | 2,157
Expected return on plan assets | (3,485) | (3,405)
Amortization of net prior period gain | 0 | (219)
Amortization of net actuarial (gain) losses | (713) | (449)
Net periodic pension/benefit cost (return) | (2,050) | (1,572)
Impact of PUC D&Os | 1,888 | 1,425
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | (162) | (147)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits |  |
Defined Benefit Plan |  |
Service cost | 10,916 | 11,019
Interest cost | 24,627 | 23,698
Expected return on plan assets | (33,777) | (32,972)
Amortization of net prior period gain | 0 | 0
Amortization of net actuarial (gain) losses | 12 | 19
Net periodic pension/benefit cost (return) | 1,778 | 1,764
Impact of PUC D&Os | 18,090 | 18,133
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 19,868 | 19,897
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits |  |
Defined Benefit Plan |  |
Service cost | 278 | 340
Interest cost | 1,779 | 2,063
Expected return on plan assets | (3,434) | (3,353)
Amortization of net prior period gain | 0 | (218)
Amortization of net actuarial (gain) losses | (694) | (434)
Net periodic pension/benefit cost (return) | (2,071) | (1,602)
Impact of PUC D&Os | 1,888 | 1,425
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | $ (183) | $ (177)

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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 prior service cost (credit) 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)(5) -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)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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