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37 Commitments (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Energy Purchase and Transportation Contracts [member]    
DisclosureOfCommitmentsLineItems [Line Items]    
Commitments R$ 132,879,053 R$ 137,279,155
Construction of Transmission Grid and Substations [member]    
DisclosureOfCommitmentsLineItems [Line Items]    
Commitments 12,062 115,732
Construction Of Cutia Wind Farm [member]    
DisclosureOfCommitmentsLineItems [Line Items]    
Commitments 330,257  
Construction Of SHP Bela Vista [member]    
DisclosureOfCommitmentsLineItems [Line Items]    
Commitments 23,717 111,481
Telecommunications Works [member]    
DisclosureOfCommitmentsLineItems [Line Items]    
Commitments 132,430 90,769
Acquisition Of Assets For Electricity Distribution [member]    
DisclosureOfCommitmentsLineItems [Line Items]    
Commitments 978,189 428,441
Gas Purchase Contracts [member]    
DisclosureOfCommitmentsLineItems [Line Items]    
Commitments R$ 655,422 R$ 859,211