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REVENUE (Tables)
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
2024202320242023
Non-member electric sales:
Long-term contracts$29,813 $8,996 $51,188 $21,796 
Short-term contracts8,955 9,490 23,199 38,640 
Rate stabilization16,901 11,064 16,901 22,821 
Provision for rate refunds— (6)— 304 
Coal sales1,814 3,315 3,458 4,394 
Other21,730 11,371 40,190 28,150 
Total non-member electric sales and other operating revenue$79,213 $44,230 $134,936 $116,105