Pension and other post-retirement benefits (Tables)

6 Months Ended

Jun. 30, 2022

Components of Net Benefit Costs For Pension Plans and OPEB Recorded as Part of Administrative Expenses

The following table lists the components of net benefit costs for the pension plans and other post-employment benefits (“OPEB”) in the unaudited interim consolidated statements of operations for the three and six months ended June 30:


	Pension benefits
	Three months ended June 30				Six months ended June 30
	2022		2021		2022		2021
Service cost	$	4,532	$	4,508	$	8,388	$	8,336
Non-service costs
Interest cost	6,778		3,511		12,841		10,217
Expected return on plan assets	(10,519)		(6,616)		(20,843)		(17,780)
Amortization of net actuarial loss	1,257		2,540		2,046		4,812
Amortization of prior service credits	(389)		(406)		(792)		(813)

Impact of regulatory accounts	4,664		4,825		11,002		11,009
	$	1,791	$	3,854	$	4,254	$	7,445
Net benefit cost	$	6,323	$	8,362	$	12,642	$	15,781


	OPEB
	Three months ended June 30				Six months ended June 30
	2022		2021		2022		2021
Service cost	$	1,554	$	1,772	$	3,109	$	3,544
Non-service costs
Interest cost	2,282		3,031		4,641		4,052
Expected return on plan assets	(2,841)		(2,510)		(5,682)		(5,021)
Amortization of net actuarial loss (gain)	(86)		436		(172)		873
Amortization of prior service credits	6		—		12		—

Impact of regulatory accounts	1,106		(950)		1,783		196
	$	467	$	7	$	582	$	100
Net benefit cost	$	2,021	$	1,779	$	3,691	$	3,644