REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Regulated Operating Revenue, Gas	$ 375,063	$ 335,747	$ 1,727,122	$ 1,428,448
Regulated Operating Revenue, Other	4,062	4,651	10,934	24,407
Regulated Operating Revenue	379,125	340,398	1,738,056	1,452,855
Unbilled Receivables, Current	88,600		88,600		$ 212,000
Natural gas sales to customers [Member]
Regulated Operating Revenue, Gas	326,975	289,243	1,566,410	1,277,099
Transportation revenues [Member]
Regulated Operating Revenue, Gas	30,957	30,492	105,422	100,046
Securitization Customer Charges
Regulated Operating Revenue, Gas	11,216	10,515	36,058	33,741
Miscellaneous revenues [Member]
Regulated Operating Revenue, Gas	5,915	5,497	19,232	17,562
Other revenues - natural gas sales related [Member]
Regulated Operating Revenue, Other	375	535	1,104	14,757
Other revenues [Member]
Regulated Operating Revenue, Other	$ 3,687	$ 4,116	$ 9,830	$ 9,650