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SEGMENTS OF BUSINESS - Key Metrics Reviewed (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
SEGMENTS OF BUSINESS |  |  |  |
Fuel | $ (27,119) | $ (13,755) | $ (57,392) | $ (34,684)
Other Operating and Maintenance Costs | (44,415) | (32,741) | (101,759) | (103,704)
Cost of Purchased Power | (2,074) | (3,149) | (11,086) | (7,694)
Utilities | (4,543) | (3,586) | (13,202) | (12,090)
Labor | (27,574) | (26,721) | (81,402) | (88,444)
Delivered Energy |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 77,776 | 56,256 | 194,044 | 148,490
Capacity Revenue |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 15,459 | 15,860 | 45,110 | 44,506
Electric sales |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 93,235 | 72,116 | 239,154 | 192,996
EBITDA Margin | 44,117 | 41,083 | 115,993 | 102,813
Coal Sales |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 51,256 | 31,662 | 119,588 | 114,093
EBITDA Margin | (8,721) | (20,478) | (32,354) | (53,775)
Electric Operations |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 93,235 | 72,116 | 239,154 | 192,996
Electric Operations | Delivered Energy |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 77,776 | 56,256 | 194,044 | 148,490
Electric Operations | Capacity Revenue |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 15,459 | 15,860 | 45,110 | 44,506
Electric Operations | Operating Segment |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Fuel | (44,751) | (30,181) | (104,150) | (79,532)
Other Operating Costs | (1) | (36) | (10) | (22)
Total Variable Costs | (44,752) | (30,217) | (104,160) | (79,554)
Other Operating and Maintenance Costs | (9,368) | (5,561) | (24,602) | (22,926)
Cost of Purchased Power | (2,074) | (3,149) | (11,086) | (7,694)
Utilities | (1,873) | (492) | (3,932) | (1,451)
Labor | (7,949) | (7,360) | (23,731) | (22,203)
Margin Without General And Administrative | 27,219 | 25,337 | 71,643 | 59,168
General and administrative | (1,308) | (1,252) | (3,972) | (3,760)
EBITDA Margin | 25,911 | 24,085 | 67,671 | 55,408
Electric Operations | Operating Segment | Delivered Energy |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 77,776 | 56,256 | 194,044 | 148,490
Electric Operations | Operating Segment | Capacity Revenue |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 15,459 | 15,860 | 45,110 | 44,506
Electric Operations | Operating Segment | Electric sales |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 93,235 | 72,116 | 239,154 | 192,996
EBITDA Margin | 25,911 | 24,085 | 67,671 | 55,408
Coal Operations |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 51,256 | 31,662 | 119,588 | 114,093
Coal Operations | Operating Segment |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Fuel | (574) | (572) | (1,564) | (2,557)
Other Operating and Maintenance Costs | (35,046) | (27,031) | (77,147) | (80,419)
Utilities | (2,670) | (3,094) | (9,270) | (10,639)
Labor | (19,625) | (19,361) | (57,671) | (66,241)
Margin Without General And Administrative | 10,899 | (1,738) | 23,465 | 210
General and administrative | (2,062) | (2,082) | (6,290) | (8,012)
EBITDA Margin | 8,837 | (3,820) | 17,175 | (7,802)
Coal Operations | Operating Segment | Coal Sales |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Revenues | 68,814 | 48,320 | 169,117 | 160,066
EBITDA Margin | $ 8,837 | $ (3,820) | $ 17,175 | $ (7,802)

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