REGULATORY ASSETS AND LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2023

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, 2023
	Remaining 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, net of amortization		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 federal income tax rate changes.

		December 31, 2022
	Remaining Recovery Period	Current		Noncurrent		Total
		(Thousands of dollars)
Winter weather event costs	(a)	$	221,926	$	36,291	$	258,217
Under-recovered purchased-gas costs	1 year	19,755		—		19,755
Pension and postemployment benefit costs	See Note 11	—		258,257		258,257
Reacquired debt costs	6 years	812		3,347		4,159
MGP remediation costs	15 years	98		29,743		29,841
Ad-valorem tax	1 year	13,359		—		13,359
WNA	1 year	8,474		—		8,474
Customer credit deferrals	1 year	9,504		—		9,504
Other	1 to 18 years	1,644		3,193		4,837
Total regulatory assets, net of amortization		275,572		330,831		606,403
Pension and other postemployment benefit costs	See Note 11	(8,228)		—		(8,228)
Income tax rate changes	(a)	—		(529,441)		(529,441)
Over-recovered purchased-gas costs	1 year	(39,639)		—		(39,639)
Total regulatory liabilities		(47,867)		(529,441)		(577,308)
Net regulatory assets and liabilities		$	227,705	$	(198,610)	$	29,095
(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 federal income tax rate changes.