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Intangible assets (Details 4) - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use R$ 463,476 R$ 492,739
Leases - Concession Agreement – URAE-1 [Member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use 338,740 374,679
Leases - Concession Agreement – URAE-1 [Member] | Costs [Member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use 588,534 588,600
Leases - Concession Agreement – URAE-1 [Member] | Accumulated Amortizations [Member]    
IfrsStatementLineItems [Line Items]    
Accumulated amortization (249,794) (213,921)
Vehicles [member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use 216,431 205,593
Properties [Member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use 22,098 11,566
Office equipment [member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use 1,577 45
Accumulated Amortization [Member]    
IfrsStatementLineItems [Line Items]    
Accumulated amortization (115,370) (99,144)
Right Of Use Assets Net [Member]    
IfrsStatementLineItems [Line Items]    
Total Leases and Right of use R$ 124,736 R$ 118,060