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4. CONCESSIONS AND AUTHORIZATIONS (Details Narrative) - BRL (R$)
R$ in Millions
 12 Months Ended
Sep. 26, 2019
Sep. 19, 2019
Dec. 14, 2018
Dec. 31, 2019
Disclosure Of Electricity Concessions And Authorizations [line items]        
Discount of future payments 107.00%      
Concession grant fee R$ 891 R$ 852 R$ 852  
Small Hydro Plants Enterprise [Member]        
Disclosure Of Electricity Concessions And Authorizations [line items]        
Discount of future payments       12.50%
Cemig Distribution [Member]        
Disclosure Of Electricity Concessions And Authorizations [line items]        
Concession expired       Dec. 31, 2045
Two Thousand and Nineteen [Member]        
Disclosure Of Electricity Concessions And Authorizations [line items]        
Percentage of Selic rate       80.00%
Two Thousand Twenty [Member]        
Disclosure Of Electricity Concessions And Authorizations [line items]        
Percentage of Selic rate       111.00%