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Contract assets (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Debentures costs R$ 19,041 R$ 17,903
Debentures average rate 0.32% 0.38%
Gain on tariff R$ 4,014 R$ 30,654
Bateias Pilarzinho [Member]    
IfrsStatementLineItems [Line Items]    
Nominal terms percenatge 11.15%  
Londrina Figueira [Member]    
IfrsStatementLineItems [Line Items]    
Nominal terms percenatge 4.15%  
Assis Paraguacu Paulista I I [Member]    
IfrsStatementLineItems [Line Items]    
Nominal terms percenatge 7.84%