Pension and other post-retirement benefits (Tables)

6 Months Ended

Jun. 30, 2021

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
	2021		2020		2021		2020
Service cost	$	4,508	$	4,136	$	8,336	$	7,703
Non-service costs
Interest cost	3,511		4,112		10,217		8,903
Expected return on plan assets	(6,616)		(6,261)		(17,780)		(12,510)
Amortization of net actuarial loss	2,540		1,145		4,812		2,290
Amortization of prior service credits	(406)		(402)		(813)		(804)

Impact of regulatory accounts	4,825		4,769		11,009		8,307
	$	3,854	$	3,363	$	7,445	$	6,186
Net benefit cost	$	8,362	$	7,499	$	15,781	$	13,889


	OPEB
	Three months ended June 30				Six months ended June 30
	2021		2020		2021		2020
Service cost	$	1,772	$	1,466	$	3,544	$	2,933
Non-service costs
Interest cost	3,031		1,755		4,052		3,574
Expected return on plan assets	(2,510)		(2,193)		(5,021)		(4,385)
Amortization of net actuarial loss (gain)	436		(14)		873		(27)


Impact of regulatory accounts	(950)		706		196		1,625
	$	7	$	254	$	100	$	787
Net benefit cost	$	1,779	$	1,720	$	3,644	$	3,720