REGULATORY ASSETS AND LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2025

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:

		December 31, 2025
	Recovery Period	Current		Noncurrent		Total
		(Thousands of dollars)
Under-recovered purchased-gas costs	1 year	$	10,692	$	—	$	10,692
Pension and postemployment benefit costs, net	See Note 11	10,929		221,809		232,738
Reacquired debt costs	3 years	723		1,266		1,989
MGP remediation costs	15 years	1,000		29,105		30,105
WNA	1 year	19,175		—		19,175
Customer credit deferrals	1 to 30 years	2,953		1,091		4,044
Other, net	1 to 25 years	4,032		2,954		6,986
Total regulatory assets		49,504		256,225		305,729
Income tax rate changes	(a)	—		(444,986)		(444,986)
Over-recovered purchased-gas costs	1 year	(56,876)		—		(56,876)
Ad-valorem tax	1 year	(165)		—		(165)
Other	1 to 6 years	(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)
(a) Recovery period varies by jurisdiction. See discussion below for additional information regarding our regulatory liabilities related to income tax rate changes.

		December 31, 2024
	Recovery Period	Current		Noncurrent		Total
		(Thousands of dollars)
Winter weather event costs	(a)	$	9,051	$	15,938	$	24,989
Under-recovered purchased-gas costs	1 year	43,819		—		43,819
Pension and postemployment benefit costs, net	See Note 11	1,358		224,837		226,195
Reacquired debt costs	4 years	723		1,989		2,712
MGP remediation costs	15 years	1,000		30,067		31,067
Ad-valorem tax	1 year	14,066		—		14,066
WNA	1 year	26,684		—		26,684
Customer credit deferrals	1 to 30 years	255		3,639		3,894
Other, net	1 to 20 years	4,254		1,536		5,790
Total regulatory assets		101,210		278,006		379,216
Income tax rate changes	(a)	—		(467,563)		(467,563)
Over-recovered purchased-gas costs	1 year	(22,525)		—		(22,525)
Total regulatory liabilities		(22,525)		(467,563)		(490,088)
Net regulatory assets and liabilities		$	78,685	$	(189,557)	$	(110,872)
(a) Recovery period varies by jurisdiction. See discussion below for additional information regarding our regulatory liabilities related to income tax rate changes.