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17 Property, Plant and Equipment (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of joint operations [line items]      
Joint operations R$ 1,349,434 R$ 1,393,501  
HPP Maua (Consorcio Energetico Cruzeiro do Sul) [member]      
Disclosure of joint operations [line items]      
Share 51.00%    
Joint operations R$ 649,290 670,706  
HPP Baixo Iguacu [member]      
Disclosure of joint operations [line items]      
Share 30.00%    
Joint operations R$ 700,144 722,795  
In Service [member] | Accumulated Depreciation [member]      
Disclosure of joint operations [line items]      
Annual average depreciation rate 3.43%    
Joint operations R$ (235,454) (206,000)  
In Service [member] | HPP Maua (Consorcio Energetico Cruzeiro do Sul) [member]      
Disclosure of joint operations [line items]      
Joint operations 859,917 859,917  
In Service [member] | HPP Baixo Iguacu [member]      
Disclosure of joint operations [line items]      
Joint operations R$ 691,833   R$ 692,593
In Progress [member] | Accumulated Depreciation [member]      
Disclosure of joint operations [line items]      
Annual average depreciation rate 3.29%    
Joint operations R$ (41,803) (19,038)  
In Progress [member] | HPP Maua (Consorcio Energetico Cruzeiro do Sul) [member]      
Disclosure of joint operations [line items]      
Joint operations 24,827 16,789  
In Progress [member] | HPP Baixo Iguacu [member]      
Disclosure of joint operations [line items]      
Joint operations R$ 50,114 R$ 49,240