Segment Information (Tables)

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Schedule of Accounts Receivable for Services

Accounts receivable for these services, which are not eliminated during consolidation, are presented in the table below:

(Thousands of dollars)	March 31, 2024		December 31, 2023
Centuri accounts receivable for services provided to Southwest	$	8,409	$	13,017

Schedule of Segment Reporting Information

The financial information pertaining to the natural gas distribution, utility infrastructure services, and pipeline and storage segments are as follows:

(Thousands of dollars)	Natural Gas Distribution		Utility Infrastructure Services		Pipeline and Storage		Other		Total
Three Months Ended March 31, 2024
Revenues from external customers	$	1,052,933	$	504,745	$	—	$	—	$	1,557,678
Intersegment revenues	—		23,278		—		—		23,278
Total	$	1,052,933	$	528,023	$	—	$	—	$	1,580,956
Segment net income (loss)	$	135,825	$	(36,230)	$	—	$	(11,858)	$	87,737
Three Months Ended March 31, 2023
Revenues from external customers	$	914,879	$	624,489	$	35,132	$	—	$	1,574,500
Intersegment revenues	—		28,804		—		—		28,804
Total	$	914,879	$	653,293	$	35,132	$	—	$	1,603,304
Segment net income (loss)	$	134,696	$	(11,872)	$	(16,288)	$	(60,625)	$	45,911