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SEGMENTS OF BUSINESS - Schedule of EBITDA Margin to Income (loss) before Income Taxes (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 |  |  |  |
Other Operating Revenue | $ 2,355 | $ 1,377 | $ 8,780 | $ 3,685
Depreciation, Depletion and Amortization | (9,142) | (13,838) | (29,661) | (42,930)
Asset Retirement Obligations Accretion | (446) | (410) | (1,310) | (1,208)
Exploration Costs | (38) | (62) | (157) | (179)
Gain (loss) on disposal or abandonment of assets, net | 2,334 | 290 | 2,410 | 536
Interest Expense | (4,927) | (2,692) | (12,469) | (10,364)
Loss on Extinguishment of Debt |  |  |  | (2,790)
Equity Method Investment (Loss) | (248) | (234) | (287) | (740)
Corporate - General and Administrative | (1,400) | (3,136) | (8,834) | (8,446)
Corporate - Other Operating and Maintenance Costs |  | (114) |  | (337)
NET INCOME (LOSS) BEFORE INCOME TAXES | 23,884 | 1,786 | 42,111 | (13,735)
Electric sales |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
EBITDA Margin | 44,117 | 41,083 | 115,993 | 102,813
Coal sales |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
EBITDA Margin | (8,721) | (20,478) | (32,354) | (53,775)
Operating Segment | Electric Operations |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
EBITDA Margin | 25,911 | 24,085 | 67,671 | 55,408
Other Operating Revenue | 192 | 187 | 3,413 | 518
Depreciation, Depletion and Amortization | (5,131) | (4,802) | (15,456) | (14,197)
Asset Retirement Obligations Accretion | (126) | (115) | (369) | (339)
Interest Expense | (2,585) | (181) | (6,208) | (515)
NET INCOME (LOSS) BEFORE INCOME TAXES | 18,261 | 19,174 | 49,051 | 40,875
Operating Segment | Electric Operations | Electric sales |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
EBITDA Margin | 25,911 | 24,085 | 67,671 | 55,408
Operating Segment | Coal Operations |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
EBITDA Margin | 8,837 | (3,820) | 17,175 | (7,802)
Other Operating Revenue | 1,647 | 721 | 4,370 | 2,028
Depreciation, Depletion and Amortization | (3,992) | (9,013) | (14,148) | (28,671)
Asset Retirement Obligations Accretion | (320) | (295) | (941) | (869)
Exploration Costs | (38) | (62) | (157) | (179)
Gain (loss) on disposal or abandonment of assets, net | 2,334 | 290 | 2,410 | 536
Interest Expense | (2,342) | (2,511) | (6,261) | (8,908)
NET INCOME (LOSS) BEFORE INCOME TAXES | 6,126 | (14,690) | 2,448 | (43,865)
Operating Segment | Coal Operations | Coal sales |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
EBITDA Margin | 8,837 | (3,820) | 17,175 | (7,802)
Corporate and Other and Eliminations |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
Other Operating Revenue | 516 | 469 | 997 | 1,139
Depreciation, Depletion and Amortization | (19) | (23) | (57) | (62)
Interest Expense |  |  |  | (941)
Loss on Extinguishment of Debt |  |  |  | (2,790)
Equity Method Investment (Loss) | (248) | (234) | (287) | (740)
Corporate - General and Administrative | (1,400) | (3,136) | (8,834) | (8,446)
Corporate - Other Operating and Maintenance Costs |  | (114) |  | (337)
NET INCOME (LOSS) BEFORE INCOME TAXES | (503) | (2,698) | (9,388) | (10,745)
Corporate and Other and Eliminations | Electric sales |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
EBITDA Margin | 18,206 | 16,998 | 48,322 | 47,405
Corporate and Other and Eliminations | Coal sales |  |  |  |
SEGMENTS OF BUSINESS |  |  |  |
EBITDA Margin | $ (17,558) | $ (16,658) | $ (49,529) | $ (45,973)

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