REVENUE (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Regulated Operating Revenue, Gas | $ 397,446 | $ 414,802 | $ 1,213,169 | $ 1,352,059 | |
| Regulated Operating Revenue, Other | 14,193 | 8,939 | 30,181 | 6,872 | |
| Regulated Operating Revenue | 411,639 | 423,741 | 1,243,350 | 1,358,931 | |
| Unbilled Receivables, Current | 89,500 | 89,500 | $ 216,400 | ||
| Natural gas sales to customers [Member] | |||||
| Regulated Operating Revenue, Gas | 349,530 | 364,187 | 1,107,898 | 1,239,435 | |
| Transportation revenues [Member] | |||||
| Regulated Operating Revenue, Gas | 30,660 | 30,717 | 70,463 | 74,465 | |
| Securitization Customer Charges | |||||
| Regulated Operating Revenue, Gas | 10,876 | 13,205 | 21,853 | 24,842 | |
| Miscellaneous revenues [Member] | |||||
| Regulated Operating Revenue, Gas | 6,380 | 6,693 | 12,955 | 13,317 | |
| Other revenues - natural gas sales related [Member] | |||||
| Regulated Operating Revenue, Other | 9,452 | 5,553 | 21,254 | 729 | |
| Other revenues [Member] | |||||
| Regulated Operating Revenue, Other | $ 4,741 | $ 3,386 | $ 8,927 | $ 6,143 | |