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Schedule of insurance policies (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
BRL (R$)
Operational Risks H P P Baixo Lguacu [Member]  
IfrsStatementLineItems [Line Items]  
End of term 05.30.2022
Insured amount R$ 2,250,207
Operational Risks Cutia And Bento Miguel [Member]  
IfrsStatementLineItems [Line Items]  
End of term 03.29.2023
Insured amount R$ 2,196,012
Named Perils [Member]  
IfrsStatementLineItems [Line Items]  
End of term 08.24.2022
Insured amount R$ 2,089,718
Operational Risks H P P Colider [Member]  
IfrsStatementLineItems [Line Items]  
End of term 12.01.2022
Insured amount R$ 1,892,320
Operational Risks H P P Governador Jayme Canet Junior [Member]  
IfrsStatementLineItems [Line Items]  
End of term 01.22.2023
Insured amount R$ 1,594,472
Fire Company Owned And Rented Facilities [Member]  
IfrsStatementLineItems [Line Items]  
End of term 08.24.2022
Insured amount R$ 878,937
Operational Risks Brisa Potiguar [Member]  
IfrsStatementLineItems [Line Items]  
End of term 06.27.2022
Insured amount R$ 743,616
Operational Risks Elejor [Member]  
IfrsStatementLineItems [Line Items]  
End of term 03.11.2023
Insured amount R$ 728,426
Operational Risks U E G Araucana [Member]  
IfrsStatementLineItems [Line Items]  
End of term 11.30.2022
Insured amount R$ 699,136
Operational Risks Sao Bento [Member]  
IfrsStatementLineItems [Line Items]  
End of term 06.27.2022
Insured amount R$ 510,557