Annual report pursuant to Section 13 and 15(d)

MAJOR CUSTOMERS AND CONCENTRATION OF CREDIT RISK (Details)

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MAJOR CUSTOMERS AND CONCENTRATION OF CREDIT RISK (Details) - Accounts receivable - Credit Concentration Risk
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Southern Nuclear Operating Company    
Concentration Risk    
Concentration risk percentage 34.00% 11.00%
Tennessee Valley Authority    
Concentration Risk    
Concentration risk percentage 11.00%  
Energy Northwest    
Concentration Risk    
Concentration risk percentage 10.00%  
WECTEC Global Project Services    
Concentration Risk    
Concentration risk percentage   26.00%