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REVENUE (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
MWh
contract
Jun. 30, 2024
USD ($)
MWh
Dec. 31, 2024
USD ($)
$ / MWh
$ / kWh
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Contract with Customer, Liability $ 146,719   $ 146,719 $ 113,741 $ 207,695
Contract value $ 52,100        
Contract with customer, liability, revenue recognized     70,200 123,600  
Supply commitment, number of contracts | contract 3        
Supply commitment, agreed supply of power, Megawatt Per Hour | MWh 1,389,600        
Physically Delivered Prepaid Power Contract One          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Short-Term Purchase Agreement, Prepaid Contract Amount   $ 45,000      
Short-Term Purchase Commitment, Total Usage of Power, Megawatt Per Hour (Megawatt-Hour) | MWh   1,302,480      
Physically Delivered Prepaid Power Contract Two          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Long Term Purchase Agreement Prepaid Contract Amount $ 60,000        
Long Term Purchase Commitment Total Usage Of Power Megawatt Per Hour | MWh 1,918,200        
Incremental borrowing rate 10.30%        
Contract value $ 60,000        
Capacity Payment Reduction Agreement          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Contract with Customer, Liability 42,000   42,000    
Advance payments from customers     160,000 41,200  
Hallador Power Company, LLC | Additional Power Purchase Agreement          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Advance payments from customers     35,400 $ 35,300  
Additional Obligations [Member] | Power Purchase Agreement          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount 230,800   230,800    
Additional Obligations [Member] | Capacity Payment Reduction Agreement          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount 131,300   $ 131,300    
Hoosier [Member] | Power Purchase Agreement          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Long-term Purchase Commitment, Minimum Quantity Required, Price Per Megawatt Hour | $ / MWh     56    
Contract with Customer, Liability 43,500   $ 43,500    
Hoosier [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Hoosier asset purchase agreement          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount 59,000   $ 59,000    
Hoosier [Member] | Contract Capacity [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Price Per Kilowatts-month | $ / kWh     7.02    
Hoosier [Member] | Contract Capacity [Member] | Hoosier asset purchase agreement          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Long-term Purchase Commitment, Minimum Quantity Required, Price Per Megawatt Hour | $ / MWh     56    
Revenue, Remaining Performance Obligation, Amount 186,600   $ 186,600    
Hoosier [Member] | Contract Capacity [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount 18,600   $ 18,600    
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Price Per Kilowatts-month | $ / kWh     5.8    
Hoosier [Member] | Contract Capacity [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, Remaining Performance Obligation, Amount $ 59,500   $ 59,500    
Hoosier [Member] | Electricity, Purchased [Member]          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Megawatts Provided Year One     917    
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Megawatts Provided Year Two Through Four     300    
Hoosier [Member] | Electricity, Purchased [Member] | Hoosier asset purchase agreement          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Long-term Purchase Commitment, Minimum Quantity Required, Price Per Megawatt Hour | $ / MWh     34