SEGMENTS OF BUSINESS - Key Metrics Reviewed (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| SEGMENTS OF BUSINESS | ||||
| Fuel | $ (15,451) | $ (15,063) | $ (30,414) | $ (30,273) |
| Other operating and maintenance costs | (39,132) | (28,955) | (68,288) | (57,344) |
| Cost of purchased power | (8,633) | (2,172) | (23,496) | (9,012) |
| Utilities | (3,960) | (4,507) | (9,974) | (8,659) |
| Labor | (28,812) | (26,799) | (56,200) | (53,828) |
| Segment EBITDA | 98 | 18,266 | 5,290 | 50,098 |
| Delivered energy | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | 40,901 | 44,132 | 93,144 | 116,268 |
| Accredited capacity revenue | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | 18,608 | 15,844 | 34,142 | 29,651 |
| Coal sales | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | 40,601 | 38,147 | 75,681 | 68,332 |
| Electric Operations | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | 59,509 | 59,976 | 127,286 | 145,919 |
| Segment EBITDA | (2,076) | 15,617 | 2,174 | 41,760 |
| Electric Operations | Delivered energy | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | 40,901 | 44,132 | 93,144 | 116,268 |
| Electric Operations | Accredited capacity revenue | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | 18,608 | 15,844 | 34,142 | 29,651 |
| Electric Operations | Operating Segment | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | 59,509 | 59,976 | 127,286 | 145,919 |
| Fuel | (25,263) | (21,328) | (52,790) | (59,399) |
| Other operating costs | (1) | (29) | (9) | |
| Total variable costs | (25,263) | (21,329) | (52,819) | (59,408) |
| Other operating and maintenance costs | (16,305) | (10,707) | (25,159) | (15,234) |
| Cost of purchased power | (8,633) | (2,172) | (23,496) | (9,012) |
| Utilities | (1,281) | (1,383) | (4,096) | (2,059) |
| Labor | (8,622) | (7,639) | (16,751) | (15,782) |
| Segment margin without general and administrative | (595) | 16,746 | 4,965 | 44,424 |
| General and administrative | (1,481) | (1,129) | (2,791) | (2,664) |
| Segment EBITDA | (2,076) | 15,617 | 2,174 | 41,760 |
| Electric Operations | Operating Segment | Delivered energy | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | 40,901 | 44,132 | 93,144 | 116,268 |
| Electric Operations | Operating Segment | Accredited capacity revenue | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | 18,608 | 15,844 | 34,142 | 29,651 |
| Coal Operations | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | 40,601 | 38,147 | 75,681 | 68,332 |
| Segment EBITDA | 2,174 | 2,649 | 3,116 | 8,338 |
| Coal Operations | Operating Segment | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | 50,874 | 45,529 | 97,286 | 100,303 |
| Fuel | (786) | (434) | (1,314) | (990) |
| Total variable costs | (786) | (434) | (1,314) | (990) |
| Other operating and maintenance costs | (22,827) | (18,247) | (43,100) | (42,101) |
| Utilities | (2,679) | (3,124) | (5,878) | (6,600) |
| Labor | (20,190) | (19,160) | (39,449) | (38,046) |
| Segment margin without general and administrative | 4,392 | 4,564 | 7,545 | 12,566 |
| General and administrative | (2,218) | (1,915) | (4,429) | (4,228) |
| Segment EBITDA | 2,174 | 2,649 | 3,116 | 8,338 |
| Coal Operations | Operating Segment | Coal sales | ||||
| SEGMENTS OF BUSINESS | ||||
| Revenues | $ 50,874 | $ 45,529 | $ 97,286 | $ 100,303 |