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32 Operating Costs and Expenses (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating costs and expenses [line items]      
Third-party services expense R$ 558,041    
Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense   R$ 526,008 R$ 481,101
Maintenance of electrical system [member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense 206,688    
Maintenance of electrical system [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense   164,510 144,163
Maintenance of facilities [member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense 97,889    
Maintenance of facilities [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense   102,295 88,186
Consumer service [member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense 54,713    
Consumer service [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense   35,548 15,470
Meter reading and bill delivery [member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense 48,895    
Meter reading and bill delivery [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense   45,515 43,968
Communication processing and transmission of data [member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense 42,244    
Communication processing and transmission of data [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense   51,919 47,954
Consulting and audit [member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense 41,043    
Consulting and audit [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense   20,456 40,694
Other services [member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense R$ 66,569    
Other services [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Third-party services expense   R$ 105,765 R$ 100,666