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Retirement benefits
 9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Retirement benefits Retirement benefits
Defined benefit pension and other postretirement benefit plans information.  For the first nine months of 2023, the Company contributed $6 million ($6 million by the Utilities) to its pension and other postretirement benefit plans, compared to $32 million ($31 million by the Utilities) in the first nine months of 2022. The Company’s current estimate of total contributions to its pension and other postretirement benefit plans in 2023 is $8 million ($8 million by the Utilities), compared to $43 million ($42 million by the Utilities) in 2022. In addition, the Company expects to pay directly $3 million ($1 million by the Utilities) of benefits in 2023, compared to $2 million ($1 million by the Utilities) paid in 2022.
The components of net periodic pension costs (NPPC) and net periodic benefit costs (NPBC) for HEI consolidated and Hawaiian Electric consolidated were as follows:
Three months ended September 30Nine months ended September 30
 Pension benefitsOther benefitsPension benefitsOther benefits
(in thousands)20232022202320222023202220232022
HEI consolidated
Service cost$11,418 $18,831 $385 $624 $34,210 $58,478 $1,072 $1,937 
Interest cost26,022 20,274 2,075 1,593 77,265 59,895 6,389 4,868 
Expected return on plan assets(35,238)(35,163)(3,426)(3,394)(105,630)(105,827)(10,236)(10,189)
Amortization of net prior period gain— — (218)(232)— — (656)(696)
Amortization of net actuarial (gain)/losses138 7,782 (518)(3)515 20,376 (1,416)(9)
Net periodic pension/benefit cost (return)
2,340 11,724 (1,702)(1,412)6,360 32,922 (4,847)(4,089)
Impact of PUC D&Os17,663 8,758 1,536 1,289 53,929 27,861 4,385 3,725 
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os)$20,003 $20,482 $(166)$(123)$60,289 $60,783 $(462)$(364)
Hawaiian Electric consolidated
Service cost$11,071 $18,248 $380 $617 $33,108 $56,883 $1,060 $1,915 
Interest cost24,116 18,850 1,981 1,525 71,513 55,773 6,107 4,670 
Expected return on plan assets(33,029)(33,314)(3,374)(3,343)(98,972)(100,405)(10,081)(10,035)
Amortization of net prior period gain— — (218)(232)— — (654)(694)
Amortization of net actuarial (gain)/losses(16)7,519 (503)— 21 19,769 (1,370)— 
Net periodic pension/benefit cost (return)
2,142 11,303 (1,734)(1,433)5,670 32,020 (4,938)(4,144)
Impact of PUC D&Os17,663 8,758 1,536 1,289 53,929 27,861 4,385 3,725 
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os)$19,805 $20,061 $(198)$(144)$59,599 $59,881 $(553)$(419)
HEI consolidated recorded retirement benefits expense of $33 million ($32 million by the Utilities) in the first nine months of 2023 and $35 million ($34 million by the Utilities) in the first nine months of 2022 and charged the remaining net periodic benefit cost primarily to electric utility plant.
The Utilities have implemented pension and OPEB tracking mechanisms under which all of their retirement benefit expenses (except for executive life and nonqualified pension plan expenses) determined in accordance with GAAP are recovered over time. Under the tracking mechanisms, any actual costs determined in accordance with GAAP that are over/under amounts allowed in rates are charged/credited to a regulatory asset/liability. The regulatory asset/liability for each utility will then be amortized over five years beginning with the respective utility’s next rate case.
Defined contribution plans information.  For the first nine months of 2023 and 2022, the Company’s expenses for its defined contribution plans under the Hawaiian Electric Industries Retirement Savings Plan (HEIRSP) and the ASB 401(k) Plan were $7.0 million and $6.5 million, respectively, and cash contributions were $7.6 million and $5.4 million, respectively. For the first
nine months of 2023 and 2022, the Utilities’ expenses and cash contributions for its defined contribution plan under the HEIRSP were $4.3 million and $2.9 million, respectively.