v3.26.1
Retirement benefits (Tables)
 6 Months Ended
Jun. 30, 2026
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost for Consolidated HEI
The components of net periodic pension costs and net periodic benefit costs for HEI consolidated and Hawaiian Electric consolidated were as follows:
Three months ended June 30Six months ended June 30
Pension benefitsOther benefitsPension benefitsOther benefits
(in thousands)20262025202620252026202520262025
HEI consolidated
Service cost$9,838 $9,948 $245 $248 $19,676 $19,896 $491 $496 
Interest cost27,564 26,304 1,778 1,821 55,128 52,609 3,557 3,642 
Expected return on plan assets(33,832)(33,856)(3,590)(3,510)(67,664)(67,713)(7,182)(7,020)
Amortization of net actuarial (gain)/losses65 65 (682)(746)131 130 (1,364)(1,492)
Net periodic pension/benefit cost (return)3,635 2,461 (2,249)(2,187)7,271 4,922 (4,498)(4,374)
Impact of PUC D&Os16,619 17,800 2,082 2,024 33,236 35,599 4,166 4,049 
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os)$20,254 $20,261 $(167)$(163)$40,507 $40,521 $(332)$(325)
Hawaiian Electric consolidated
Service cost$9,650 $9,705 $242 $245 $19,300 $19,410 $485 $490 
Interest cost26,667 25,430 1,699 1,740 53,333 50,859 3,398 3,481 
Expected return on plan assets(33,039)(33,052)(3,542)(3,461)(66,077)(66,101)(7,087)(6,923)
Amortization of net actuarial (gain)/losses24 24 (676)(737)49 47 (1,351)(1,474)
Net periodic pension/benefit cost (return)3,302 2,107 (2,277)(2,213)6,605 4,215 (4,555)(4,426)
Impact of PUC D&Os16,619 17,800 2,082 2,024 33,236 35,599 4,166 4,049 
Net periodic pension/benefit cost (return) (adjusted for impact of PUC D&Os)$19,921 $19,907 $(195)$(189)$39,841 $39,814 $(389)$(377)