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Contract assets (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Contract assets R$ 7,605,061 R$ 7,672,679  
Current 284,616 220,660  
Noncurrent 7,320,445 7,452,019  
Power Distribution Service Concession 1 [Member]      
IfrsStatementLineItems [Line Items]      
Contract assets 2,201,958 2,332,171  
Piped Gas Distribution Service Concession [Member]      
IfrsStatementLineItems [Line Items]      
Contract assets 30,032 R$ 29,815
Power Transmission Concession 1 [Member]      
IfrsStatementLineItems [Line Items]      
Contract assets R$ 5,403,103 R$ 5,310,476