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Schedule of prepaid expenses (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Prepaid expenses R$ 53,676 R$ 37,031
Prepaid expenses, current 53,649 36,987
Prepaid expenses, noncurrent 27 44
Program For Incentive To Alternative Energy Sources Proinfa [Member]    
IfrsStatementLineItems [Line Items]    
Prepaid expenses 35,837 22,408
Insurance Premiums [Member]    
IfrsStatementLineItems [Line Items]    
Prepaid expenses 17,692 14,453
Others [Member]    
IfrsStatementLineItems [Line Items]    
Prepaid expenses R$ 147 R$ 170