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SEGMENTS OF BUSINESS - Key Metrics Reviewed (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
SEGMENTS OF BUSINESS    
Fuels $ (49,343) $ (103,388)
Other Operating and Maintenance Costs (118,364) (199,855)
Cost of Purchased Power (10,888)  
Utilities (15,914) (17,730)
Labor (116,164) (152,417)
Delivered Energy    
SEGMENTS OF BUSINESS    
Revenues 203,434 211,772
Capacity Revenue    
SEGMENTS OF BUSINESS    
Revenues 58,093 56,155
Electric sales    
SEGMENTS OF BUSINESS    
Revenues 261,527 267,927
EBITDA Margin 137,283 127,812
Coal Sales    
SEGMENTS OF BUSINESS    
Revenues 137,448 361,926
EBITDA Margin (63,729) 40,599
Electric Operations    
SEGMENTS OF BUSINESS    
Revenues 261,527 267,927
Electric Operations | Delivered Energy    
SEGMENTS OF BUSINESS    
Revenues 203,434 211,772
Electric Operations | Capacity Revenue    
SEGMENTS OF BUSINESS    
Revenues 58,093 56,155
Electric Operations | Operating Segment    
SEGMENTS OF BUSINESS    
Fuels (111,768) (139,496)
Other Operating Costs (19) (32)
Total Variable Costs (111,787) (139,528)
Other Operating and Maintenance Costs (28,622) (33,777)
Cost of Purchased Power (10,888)  
Utilities (2,070) (429)
Labor (30,842) (31,245)
Margin Without General And Administrative 77,318 62,948
General and administrative (5,311) (4,914)
EBITDA Margin 72,007 58,034
Electric Operations | Operating Segment | Delivered Energy    
SEGMENTS OF BUSINESS    
Revenues 203,434 211,772
Electric Operations | Operating Segment | Capacity Revenue    
SEGMENTS OF BUSINESS    
Revenues 58,093 56,155
Electric Operations | Operating Segment | Electric sales    
SEGMENTS OF BUSINESS    
Revenues 261,527 267,927
EBITDA Margin 72,007 58,034
Coal Operations    
SEGMENTS OF BUSINESS    
Revenues 137,448 361,926
Coal Operations | Operating Segment    
SEGMENTS OF BUSINESS    
Fuels (2,851) (7,089)
Other Operating and Maintenance Costs (89,283) (165,479)
Utilities (13,844) (17,301)
Labor (85,322) (121,172)
Margin Without General And Administrative 11,225 121,847
General and administrative (9,877) (10,287)
EBITDA Margin 1,348 111,560
Coal Operations | Operating Segment | Coal Sales    
SEGMENTS OF BUSINESS    
Revenues 202,525 432,888
EBITDA Margin $ 1,348 $ 111,560