XML 79 R66.htm IDEA: XBRL DOCUMENT v3.25.1
Retirement benefits - Components of Net Periodic Benefit Cost for Consolidated HEI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Pension benefits    
Defined Benefit Plan    
Service cost $ 9,948 $ 11,176
Interest cost 26,305 25,449
Expected return on plan assets (33,857) (34,596)
Amortization of net actuarial (gain)/losses 65 64
Net periodic pension/benefit cost (return) 2,461 2,093
Impact of PUC D&Os 17,799 18,090
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) 20,260 20,183
Other benefits    
Defined Benefit Plan    
Service cost 248 281
Interest cost 1,821 1,861
Expected return on plan assets (3,510) (3,485)
Amortization of net actuarial (gain)/losses (746) (708)
Net periodic pension/benefit cost (return) (2,187) (2,051)
Impact of PUC D&Os 2,025 1,888
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) (162) (163)
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits    
Defined Benefit Plan    
Service cost 9,705 10,916
Interest cost 25,429 24,627
Expected return on plan assets (33,049) (33,777)
Amortization of net actuarial (gain)/losses 23 12
Net periodic pension/benefit cost (return) 2,108 1,778
Impact of PUC D&Os 17,799 18,090
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) 19,907 19,868
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits    
Defined Benefit Plan    
Service cost 245 278
Interest cost 1,741 1,779
Expected return on plan assets (3,462) (3,434)
Amortization of net actuarial (gain)/losses (737) (694)
Net periodic pension/benefit cost (return) (2,213) (2,071)
Impact of PUC D&Os 2,025 1,888
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os) $ (188) $ (183)