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27. REVENUE (Details 2) - GW
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
RevenueLineItems [Line Items]    
Total amount of energy transported [1] 20,259 19,401
Industrial [member]    
RevenueLineItems [Line Items]    
Total amount of energy transported [1] 18,612 17,723
Commercial, services and others [member]    
RevenueLineItems [Line Items]    
Total amount of energy transported [1] 1,300 1,320
Rural [member]    
RevenueLineItems [Line Items]    
Total amount of energy transported [1] 32 17
Concessionaires [member]    
RevenueLineItems [Line Items]    
Total amount of energy transported [1] 315 341
[1] Data not reviewed by external auditors