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Financial risk management - Schedule of outstanding energy trading operations (Detail) - Price risk - Electricity trading [member] - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Financial position and unrealized gains on electricity trading operations, net |  |
Assets | R$ 69,576 | R$ 96,595
Liabilities | (317,699) | (268,018)
Net loss | R$ (248,123) | R$ (189,018)

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