REGULATORY ASSETS AND LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2024

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, 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 year	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 assets related to winter weather event costs and regulatory liabilities related to income tax rate changes.

		December 31, 2023
	Recovery Period	Current		Noncurrent		Total
		(Thousands of dollars)
Winter weather event costs	(a)	$	22,633	$	21,495	$	44,128
Under-recovered purchased-gas costs	1 year	10,391		—		10,391
Pension and postemployment benefit costs	See Note 11	6,379		228,092		234,471
Reacquired debt costs	6 years	723		2,712		3,435
MGP remediation costs	15 years	98		31,893		31,991
Ad-valorem tax	1 year	14,533		—		14,533
WNA	1 year	11,404		—		11,404
Customer credit deferrals	1 year	6,184		—		6,184
Other	1 to 18 years	2,963		3,714		6,677
Total regulatory assets		75,308		287,906		363,214
Income tax rate changes	(a)	—		(500,478)		(500,478)
Over-recovered purchased-gas costs	1 year	(66,901)		—		(66,901)
Total regulatory liabilities		(66,901)		(500,478)		(567,379)
Net regulatory assets and liabilities		$	8,407	$	(212,572)	$	(204,165)
(a) Recovery period varies by jurisdiction. See discussion below for additional information regarding our regulatory assets related to winter weather event costs and regulatory liabilities related to income tax rate changes.