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SEGMENTS OF BUSINESS - Key Metrics Reviewed (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
SEGMENTS OF BUSINESS    
Fuel $ (15,210) $ (8,059)
Other Operating and Maintenance Costs (28,389) (37,262)
Cost of Purchased Power (6,840) (1,926)
Utilities (4,152) (4,594)
Labor (27,029) (35,168)
Delivered Energy    
SEGMENTS OF BUSINESS    
Revenues 72,136 48,908
Capacity Revenue    
SEGMENTS OF BUSINESS    
Revenues 13,807 11,773
Electric sales    
SEGMENTS OF BUSINESS    
Revenues 85,943 60,681
EBITDA Margin 49,560 37,509
Coal Sales    
SEGMENTS OF BUSINESS    
Revenues 30,185 49,630
EBITDA Margin (18,900) (17,611)
Electric Operations    
SEGMENTS OF BUSINESS    
Revenues 85,943 60,681
Electric Operations | Delivered Energy    
SEGMENTS OF BUSINESS    
Revenues 72,136 48,908
Electric Operations | Capacity Revenue    
SEGMENTS OF BUSINESS    
Revenues 13,807 11,773
Electric Operations | Operating Segment    
SEGMENTS OF BUSINESS    
Fuel (38,071) (24,435)
Other Operating Costs (8) (493)
Total Variable Costs (38,079) (24,928)
Other Operating and Maintenance Costs (4,527) (4,886)
Cost of Purchased Power (6,840) (1,926)
Utilities (676) (302)
Labor (8,143) (7,683)
Margin Without General And Administrative 27,678 20,956
General and administrative (1,535) (1,058)
EBITDA Margin 26,143 19,898
Electric Operations | Operating Segment | Delivered Energy    
SEGMENTS OF BUSINESS    
Revenues 72,136 48,908
Electric Operations | Operating Segment | Capacity Revenue    
SEGMENTS OF BUSINESS    
Revenues 13,807 11,773
Electric Operations | Operating Segment | Electric sales    
SEGMENTS OF BUSINESS    
Revenues 85,943 60,681
EBITDA Margin 26,143 19,898
Coal Operations    
SEGMENTS OF BUSINESS    
Revenues 30,185 49,630
Coal Operations | Operating Segment    
SEGMENTS OF BUSINESS    
Fuel (556) (1,235)
Other Operating and Maintenance Costs (23,854) (31,791)
Utilities (3,476) (4,292)
Labor (18,886) (27,485)
Margin Without General And Administrative 8,002 1,233
General and administrative (2,313) (2,438)
EBITDA Margin 5,689 (1,205)
Coal Operations | Operating Segment | Coal Sales    
SEGMENTS OF BUSINESS    
Revenues 54,774 66,036
EBITDA Margin $ 5,689 $ (1,205)