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31 Net Operating Revenue (Details 5) - National electric energy agency [member] - Energy development account CDE energia [member] - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net operating revenue [line items]      
Regulatory charges R$ 1,530,998 R$ 1,654,157 R$ 1,840,283
CDE USO [member]      
Disclosure of net operating revenue [line items]      
Regulatory charges R$ 1,530,998 R$ 1,266,152 R$ 1,040,045
CDE USO [member] | Resolution no. 2,510/2018 [member]      
Disclosure of net operating revenue [line items]      
Resolutions   Resolution No. 2,510/2018  
Period   January to June  
Regulatory charges   R$ 1,269,498  
CDE USO [member] | Preliminary injunctions [member]      
Disclosure of net operating revenue [line items]      
Resolutions (-) Preliminary injunctions (-) Preliminary injunctions (-) Preliminary injunctions
Period January to December January to June January to December
Regulatory charges R$ (715) R$ (3,346) R$ (2)
CDE USO [member] | Resolution No. 2,368/2018 [member]      
Disclosure of net operating revenue [line items]      
Resolutions     Resolution No. 2,368/2018
Period     January to August
Regulatory charges     R$ 594,972
CDE USO [member] | Resolution No. 2,446/2018 [member]      
Disclosure of net operating revenue [line items]      
Resolutions     Resolution No. 2,446/2018
Period     September to December
Regulatory charges     R$ 445,075
CDE USO [member] | Resolution no. 2,664/2019 [member]      
Disclosure of net operating revenue [line items]      
Resolutions Resolution No. 2,664/2019    
Period January to December    
Regulatory charges R$ 1,531,713    
CONTA ACR [member]      
Disclosure of net operating revenue [line items]      
Regulatory charges   R$ 348,177 R$ 557,981
CONTA ACR [member] | Resolution mo. 2,231/2017 [member]      
Disclosure of net operating revenue [line items]      
Resolutions   Resolution No.  2,231/2017 Resolution No. 2,231/2017
Period   January to February January to December
Regulatory charges   R$ 98,725 R$ 557,981
CONTA ACR [member] | Resolution no. 2,521/2019 [member]      
Disclosure of net operating revenue [line items]      
Resolutions   Resolution No. 2,521/2019  
Period   March to August  
Regulatory charges   R$ 296,174  
CONTA ACR [member] | Return - order no. 2,755 / 2019 [member]      
Disclosure of net operating revenue [line items]      
Resolutions   Return - Order No. 2,755 / 2019  
Regulatory charges   R$ (46,722)  
CDE ENERGIA [member]      
Disclosure of net operating revenue [line items]      
Regulatory charges   R$ 39,828 R$ 242,257
CDE ENERGIA [member] | Resolution no. 2,510/2018 [member]      
Disclosure of net operating revenue [line items]      
Resolutions   Resolution No. 2,510/2018  
Period   January to March  
Regulatory charges   R$ 41,431  
CDE ENERGIA [member] | Preliminary injunctions [member]      
Disclosure of net operating revenue [line items]      
Resolutions   (-) Preliminary injunctions (-) Preliminary injunctions
Period   January to March January to December
Regulatory charges   R$ (1,603) R$ (3,442)
CDE ENERGIA [member] | Resolution No. 2,202/2017 [member]      
Disclosure of net operating revenue [line items]      
Resolutions     Resolution No. 2,202/2017
Period     January to May
Regulatory charges     R$ 100,692
CDE ENERGIA [member] | Resolution No. 2,358/2017 [member]      
Disclosure of net operating revenue [line items]      
Resolutions     Resolution No. 2,358/2017
Period     June to December
Regulatory charges     R$ 145,007