Retirement benefits (Tables)

3 Months Ended

Mar. 31, 2023

Retirement Benefits [Abstract]

Schedule of components of net periodic benefit cost for consolidated HEI

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