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Retirement benefits - Components of NPPC and NPBC (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Pension benefits |  |
Defined Benefit Plan |  |
Service cost | $ 11,396 | $ 19,824
Interest cost | 25,621 | 19,811
Expected return on plan assets | (35,195) | (35,333)
Amortization of net prior period gain | 0 | 0
Amortization of net actuarial (gain) losses | 188 | 6,297
Net periodic pension/benefit cost (return) | 2,010 | 10,599
Impact of PUC D&Os | 18,133 | 9,551
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 20,143 | 20,150
Other benefits |  |
Defined Benefit Plan |  |
Service cost | 344 | 656
Interest cost | 2,157 | 1,637
Expected return on plan assets | (3,405) | (3,397)
Amortization of net prior period gain | (219) | (232)
Amortization of net actuarial (gain) losses | (449) | (3)
Net periodic pension/benefit cost (return) | (1,572) | (1,339)
Impact of PUC D&Os | 1,425 | 1,219
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | (147) | (120)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits |  |
Defined Benefit Plan |  |
Service cost | 11,019 | 19,318
Interest cost | 23,698 | 18,462
Expected return on plan assets | (32,972) | (33,546)
Amortization of net prior period gain | 0 | 0
Amortization of net actuarial (gain) losses | 19 | 6,125
Net periodic pension/benefit cost (return) | 1,764 | 10,359
Impact of PUC D&Os | 18,133 | 9,551
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | 19,897 | 19,910
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits |  |
Defined Benefit Plan |  |
Service cost | 340 | 649
Interest cost | 2,063 | 1,573
Expected return on plan assets | (3,353) | (3,347)
Amortization of net prior period gain | (218) | (231)
Amortization of net actuarial (gain) losses | (434) | 0
Net periodic pension/benefit cost (return) | (1,602) | (1,356)
Impact of PUC D&Os | 1,425 | 1,219
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) | $ (177) | $ (137)

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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