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Construction costs (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Construction cost R$ 1,899,844 R$ 1,417,504 R$ 1,091,396
Windfarms Of The Brisa Complex [Member]      
IfrsStatementLineItems [Line Items]      
Revenue related to the reimbursement   6,921  
Materials And Supplies [Member]      
IfrsStatementLineItems [Line Items]      
Construction cost 1,088,808 781,807 548,336
Third Party Services [Member]      
IfrsStatementLineItems [Line Items]      
Construction cost 626,540 460,952 395,607
Personnel [Member]      
IfrsStatementLineItems [Line Items]      
Construction cost 155,182 140,108 125,777
Others [Member]      
IfrsStatementLineItems [Line Items]      
Construction cost R$ 29,314 R$ 34,637 R$ 21,676