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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Pension benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | $ 11,265 | $ 11,396 | $ 22,529 | $ 22,792
Interest cost | 26,506 | 25,622 | 53,012 | 51,243
Expected return on plan assets | (35,982) | (35,197) | (71,964) | (70,392)
Amortization of net prior period gain | 0 | 0 | 0 | 0
Amortization of net actuarial (gain)/losses | 111 | 189 | 222 | 377
Net periodic pension/benefit cost (return) | 1,900 | 2,010 | 3,799 | 4,020
Impact of PUC D&Os | 18,089 | 18,133 | 36,179 | 36,266
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 19,989 | 20,143 | 39,978 | 40,286
Other benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 282 | 343 | 563 | 687
Interest cost | 1,867 | 2,157 | 3,734 | 4,314
Expected return on plan assets | (3,487) | (3,405) | (6,972) | (6,810)
Amortization of net prior period gain | 0 | (219) | 0 | (438)
Amortization of net actuarial (gain)/losses | (712) | (449) | (1,425) | (898)
Net periodic pension/benefit cost (return) | (2,050) | (1,573) | (4,100) | (3,145)
Impact of PUC D&Os | 1,887 | 1,424 | 3,775 | 2,849
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | (163) | (149) | (325) | (296)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 10,916 | 11,018 | 21,832 | 22,037
Interest cost | 24,627 | 23,699 | 49,254 | 47,397
Expected return on plan assets | (33,775) | (32,971) | (67,552) | (65,943)
Amortization of net prior period gain | 0 | 0 | 0 | 0
Amortization of net actuarial (gain)/losses | 11 | 18 | 23 | 37
Net periodic pension/benefit cost (return) | 1,779 | 1,764 | 3,557 | 3,528
Impact of PUC D&Os | 18,089 | 18,133 | 36,179 | 36,266
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 19,868 | 19,897 | 39,736 | 39,794
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 278 | 340 | 556 | 680
Interest cost | 1,779 | 2,063 | 3,558 | 4,126
Expected return on plan assets | (3,434) | (3,354) | (6,868) | (6,707)
Amortization of net prior period gain | 0 | (218) | 0 | (436)
Amortization of net actuarial (gain)/losses | (694) | (433) | (1,388) | (867)
Net periodic pension/benefit cost (return) | (2,071) | (1,602) | (4,142) | (3,204)
Impact of PUC D&Os | 1,887 | 1,424 | 3,775 | 2,849
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | $ (184) | $ (178) | $ (367) | $ (355)

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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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