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31 Net Operating Revenue (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Jul. 31, 2020
Dec. 31, 2020
Disclosure of net operating revenue [line items]    
Residential   0.95%
Commerce and services   0.83%
Public lighting   0.93%
High voltage consumers percentage   1.13%
Funds received R$ 536,359  
Updating portion B [member]    
Disclosure of net operating revenue [line items]    
Annual tariff review and authorized average rate   0.79%
Adjusting portion A [member]    
Disclosure of net operating revenue [line items]    
Annual tariff review and authorized average rate   7.82%
Financial components [member]    
Disclosure of net operating revenue [line items]    
Annual tariff review and authorized average rate   1.81%
Withdrawal of the financial components from the previous tariff process [member]    
Disclosure of net operating revenue [line items]    
Annual tariff review and authorized average rate   (10.01%)