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30. RELATED PARTY TRANSACTIONS (Details Narrative) - BRL (R$)
R$ in Millions
 1 Months Ended 12 Months Ended
Dec. 27, 2019
Nov. 25, 2019
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Disclosure of transactions between related parties [line items]            
Deliver contracted supply amount         R$ 40.0  
Loss on realization of the receivables     R$ 688.0      
In-court reorganization loan amount R$ 6.5 R$ 10.0   R$ 20.0    
Description of contract interest rate       The contracts specify interest equal to 100% of the accumulated variation in the DI rate, plus an annual spread, applied pro rata die (on 252-business-days basis), of 1.083% for the DIP contract and 2.5% for the DIP2 contract, up to the date of respective full payment.    
Related parties [member]            
Disclosure of transactions between related parties [line items]            
Aggregate amounts of legal actions       R$ 119.0 98.0  
Related parties [member] | Cemig D [member]            
Disclosure of transactions between related parties [line items]            
Public lighting contribution amount         190.0  
Due and unpaid payment of debits relating to supply of power           R$ 113.0
Loss on realization of the receivables       210.0    
Related parties [member] | Cemig [member]            
Disclosure of transactions between related parties [line items]            
Aggregate amounts of legal actions       R$ 41.0 R$ 32.0