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Schedule of commitments related to long-term contracts (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Energy Purchase And Transportation Contracts [Member]    
IfrsStatementLineItems [Line Items]    
Commitments R$ 132,307,398 R$ 132,879,053
Construction Of Transmission Grid And Substations [Member]    
IfrsStatementLineItems [Line Items]    
Commitments   12,062
Construction Of Jandara Wind Farm Complex [Member]    
IfrsStatementLineItems [Line Items]    
Commitments 147,682 330,257
Construction Of S H P Bela Vista [Member]    
IfrsStatementLineItems [Line Items]    
Commitments   23,717
Telecommunications Works [Member]    
IfrsStatementLineItems [Line Items]    
Commitments   132,430
Acquisition Of Assets For Electricity Distribution [Member]    
IfrsStatementLineItems [Line Items]    
Commitments 1,374,177 978,189
Gas Purchase Contracts [Member]    
IfrsStatementLineItems [Line Items]    
Commitments R$ 1,841,767 R$ 655,422