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Trade Accounts Receivable (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of Trade Accounts Receivable [Line Items]    
Trade receivables R$ 4,078,882 R$ 3,866,429
Debt installments [Member]    
Disclosure of Trade Accounts Receivable [Line Items]    
Trade receivables 360,928 337,499
Residential Accounts Receivable [Member] | Debt installments [Member]    
Disclosure of Trade Accounts Receivable [Line Items]    
Trade receivables 106,440 123,889
Industrial Accounts Receivable [Member] | Debt installments [Member]    
Disclosure of Trade Accounts Receivable [Line Items]    
Trade receivables 77,038 87,323
Commercial Accounts Receivable [Member] | Debt installments [Member]    
Disclosure of Trade Accounts Receivable [Line Items]    
Trade receivables 181,104 141,068
Rural Accounts Receivable [Member] | Debt installments [Member]    
Disclosure of Trade Accounts Receivable [Line Items]    
Trade receivables 10,058 10,493
Public Entities Accounts Receivable [Member] | Debt installments [Member]    
Disclosure of Trade Accounts Receivable [Line Items]    
Trade receivables 5,011 13,142
Public Lighting Accounts Receivable [Member] | Debt installments [Member]    
Disclosure of Trade Accounts Receivable [Line Items]    
Trade receivables 454 6,108
Public Service Accounts Receivable [Member] | Debt installments [Member]    
Disclosure of Trade Accounts Receivable [Line Items]    
Trade receivables 2,074 1,685
Adjustment to present value Account Receivable [Member] | Debt installments [Member]    
Disclosure of Trade Accounts Receivable [Line Items]    
Trade receivables R$ (21,251) R$ (46,209)