The following tables set forth the components of net periodic benefit cost (credit) for our pension, inclusive of our defined benefit pension plan, supplemental executive retirement plan, and other postemployment benefit plans for the periods indicated:


	Pension Benefits
	Three Months Ended				Six Months Ended
	June 30,		June 30,
	2026		2025			2026		2025
	(Thousands of dollars)
Components of net periodic benefit cost (credit)
Service cost	$	1,291	$	1,337		$	2,582	$	2,674
Interest cost (a)	9,525		10,042			19,050		20,084
Expected return on assets (a)	(10,489)		(11,910)			(20,979)		(23,820)
Amortization of unrecognized prior service cost (credit) (a)	93		93			186		186
Amortization of net loss (gain) (a)	4,220		1,865			8,440		3,730
Net periodic benefit cost (credit)	$	4,640	$	1,427		$	9,279	$	2,854
(a) These amounts, net of any amounts capitalized as a regulatory asset, have been recognized as other (income) expense, net in the consolidated statement of income. See Note 11 for additional detail.


	Other Postemployment Benefits
	Three Months Ended				Six Months Ended
	June 30,		June 30,
	2026		2025			2026		2025
	(Thousands of dollars)
Components of net periodic benefit cost (credit)
Service cost	$	112	$	123		$	222	$	246
Interest cost (a)	2,020		2,069			4,040		4,138
Expected return on assets (a)	(2,194)		(2,212)			(4,388)		(4,424)

Amortization of net loss (gain) (a)	(8)		(31)			(16)		(62)

Net periodic benefit cost (credit)	$	(70)	$	(51)		$	(142)	$	(102)
(a) These amounts, net of any amounts capitalized as a regulatory asset, have been recognized as other (income) expense, net in the consolidated statement of income. See Note 11 for additional detail.