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Trade receivables (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Subtotal R$ 5,470,564 R$ 5,233,932
Allowance for doubtful accounts (1,248,209) (1,377,209)
Total trade receivables 4,222,355 3,856,723
Current 3,894,557 3,584,287
Noncurrent 327,798 272,436
Trade receivables 4,222,355 3,856,723
Private Sector [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 3,068,872 3,039,931
Private Sector [Member] | General And Special Customers [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 2,409,094 2,200,921
Private Sector [Member] | Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 659,778 839,010
Government Entities [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 1,066,136 1,006,009
Government Entities [Member] | Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 370,823 374,372
Government Entities [Member] | Municipal [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 690,010 623,601
Government Entities [Member] | Federal [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 5,303 8,036
Wholesale Customers Municipal Governments [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 81,730 49,676
Wholesale Customers Municipal Governments [Member] | Mogi Das Cruzes [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 4,744 4,343
Wholesale Customers Municipal Governments [Member] | Sao Caetano Do Sul [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 11,773 45,333
Wholesale Customers Municipal Governments [Member] | Sao Caetanodo Sul Agreement [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 65,213
Unbilled Supply [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal R$ 1,253,826 R$ 1,138,316