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REVENUE (Tables)
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Revenue from Contracts with Non-member Customers and Other Operating Revenue The following revenue is reflected on our consolidated statements of operations as follows (dollars in thousands):
Three Months Ended March 31,
20242023
Non-member electric sales:
Long-term contracts$21,376 $11,215 
Short-term contracts14,243 30,735 
Rate stabilization— 11,757 
Provision for rate refunds— 310 
Coal sales1,643 1,079 
Other18,461 16,779 
Total non-member electric sales and other operating revenue$55,723 $71,875