REVENUE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Regulated Operating Revenue, Gas	$ 2,405,265	$ 2,045,872	$ 2,346,321
Regulated Operating Revenue, Other	22,163	37,686	25,669
Regulated Operating Revenue	2,427,428	2,083,558	2,371,990
Unbilled Receivables, Current	216,400	212,000
Natural gas sales to customers [Member]
Regulated Operating Revenue, Gas	2,187,660	1,841,400	2,141,908
Transportation revenues [Member]
Regulated Operating Revenue, Gas	144,342	137,111	132,945
Securitization Customer Charges
Regulated Operating Revenue, Gas	47,446	44,390	48,677
Miscellaneous revenues [Member]
Regulated Operating Revenue, Gas	25,817	22,971	22,791
Other revenues - natural gas sales related [Member]
Regulated Operating Revenue, Other	9,157	24,296	12,764
Other revenues [Member]
Regulated Operating Revenue, Other	$ 13,006	$ 13,390	$ 12,905