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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Pension benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | $ 11,396 | $ 19,823 | $ 22,792 | $ 39,647
Interest cost | 25,622 | 19,810 | 51,243 | 39,621
Expected return on plan assets | (35,197) | (35,331) | (70,392) | (70,664)
Amortization of net prior period gain | 0 | 0 | 0 | 0
Amortization of net actuarial (gain) losses | 189 | 6,297 | 377 | 12,594
Net periodic pension/benefit cost (return) | 2,010 | 10,599 | 4,020 | 21,198
Impact of PUC D&Os | 18,133 | 9,552 | 36,266 | 19,103
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 20,143 | 20,151 | 40,286 | 40,301
Other benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 343 | 657 | 687 | 1,313
Interest cost | 2,157 | 1,638 | 4,314 | 3,275
Expected return on plan assets | (3,405) | (3,398) | (6,810) | (6,795)
Amortization of net prior period gain | (219) | (232) | (438) | (464)
Amortization of net actuarial (gain) losses | (449) | (3) | (898) | (6)
Net periodic pension/benefit cost (return) | (1,573) | (1,338) | (3,145) | (2,677)
Impact of PUC D&Os | 1,424 | 1,217 | 2,849 | 2,436
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | (149) | (121) | (296) | (241)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 11,018 | 19,317 | 22,037 | 38,635
Interest cost | 23,699 | 18,461 | 47,397 | 36,923
Expected return on plan assets | (32,971) | (33,545) | (65,943) | (67,091)
Amortization of net prior period gain | 0 | 0 | 0 | 0
Amortization of net actuarial (gain) losses | 18 | 6,125 | 37 | 12,250
Net periodic pension/benefit cost (return) | 1,764 | 10,358 | 3,528 | 20,717
Impact of PUC D&Os | 18,133 | 9,552 | 36,266 | 19,103
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 19,897 | 19,910 | 39,794 | 39,820
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits |  |  |  |
Defined Benefit Plan |  |  |  |
Service cost | 340 | 649 | 680 | 1,298
Interest cost | 2,063 | 1,572 | 4,126 | 3,145
Expected return on plan assets | (3,354) | (3,345) | (6,707) | (6,692)
Amortization of net prior period gain | (218) | (231) | (436) | (462)
Amortization of net actuarial (gain) losses | (433) | 0 | (867) | 0
Net periodic pension/benefit cost (return) | (1,602) | (1,355) | (3,204) | (2,711)
Impact of PUC D&Os | 1,424 | 1,217 | 2,849 | 2,436
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | $ (178) | $ (138) | $ (355) | $ (275)

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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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- 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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