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20. SUPPLIERS (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of trade payables [line items]      
Total suppliers R$ 2,358 R$ 2,080 [1] R$ 1,801
Energy on spot market - CCEE [member]      
Disclosure of trade payables [line items]      
Total suppliers 490 401  
Charges for use of energy network [member]      
Disclosure of trade payables [line items]      
Total suppliers 192 145  
Energy purchased for resale [member]      
Disclosure of trade payables [line items]      
Total suppliers 808 764  
Itaipu Binacional [member]      
Disclosure of trade payables [line items]      
Total suppliers 325 243  
GAS DISTRIBUTION [member]      
Disclosure of trade payables [line items]      
Total suppliers 127 143  
Materials and services [member]      
Disclosure of trade payables [line items]      
Total suppliers R$ 416 R$ 384  
[1] See note 2.8.