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REVENUE (Tables)
 9 Months Ended
Sep. 30, 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 September 30,Nine Months Ended September 30,
2024202320242023
Non-member electric sales:
Long-term contracts$35,481 $9,731 $86,669 $31,527 
Short-term contracts38,462 41,563 61,661 80,202 
Rate stabilization108,222 14,041 125,123 36,862 
Provision for rate refunds— (210)— 94 
Coal sales7,856 3,675 11,314 8,069 
Other29,263 11,943 69,453 40,093 
Total non-member electric sales and other operating revenue$219,284 $80,743 $354,220 $196,847