REGULATORY ASSETS AND LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2026

SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]

SCHEDULE OF REGULATED ASSETS AND LIABILITIES

The tables below present a summary of regulatory assets and liabilities, net of amortization, for the periods indicated:

	March 31, 2026
	Current		Noncurrent		Total
	(Thousands of dollars)
Under-recovered purchased-gas costs	$	2,261	$	—	$	2,261
Pension and postemployment benefit costs, net	10,187		217,257		227,444
Reacquired debt costs	723		1,085		1,808
MGP remediation costs	1,000		29,592		30,592
WNA	25,165		—		25,165
Customer credit deferrals	14,779		1,081		15,860
Other, net	7,372		3,033		10,405
Total regulatory assets	61,487		252,048		313,535
Income tax rate changes	—		(432,690)		(432,690)
Over-recovered purchased-gas costs	(18,378)		—		(18,378)
Ad-valorem tax	(1,553)		—		(1,553)
Other	(1,707)		(8,351)		(10,058)
Total regulatory liabilities	(21,638)		(441,041)		(462,679)
Net regulatory assets and liabilities	$	39,849	$	(188,993)	$	(149,144)

	December 31, 2025
	Current		Noncurrent		Total
	(Thousands of dollars)
Under-recovered purchased-gas costs	$	10,692	$	—	$	10,692
Pension and postemployment benefit costs, net	10,929		221,809		232,738
Reacquired debt costs	723		1,266		1,989
MGP remediation costs	1,000		29,105		30,105
WNA	19,175		—		19,175
Customer credit deferrals	2,953		1,091		4,044
Other, net	4,032		2,954		6,986
Total regulatory assets	49,504		256,225		305,729
Income tax rate changes	—		(444,986)		(444,986)
Over-recovered purchased-gas costs	(56,876)		—		(56,876)
Ad-valorem tax	(165)		—		(165)
Other	(236)		(6,634)		(6,870)
Total regulatory liabilities	(57,277)		(451,620)		(508,897)
Net regulatory assets and liabilities	$	(7,773)	$	(195,395)	$	(203,168)