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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

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