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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Exchange rate risk (Details)
R$ in Thousands, $ in Thousands
Dec. 31, 2023
BRL (R$)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
BRL (R$)
Composition of balances in foreign currency and sensitivity analysis      
Financial assets     R$ 1,264,059
USD | Risk of exchange rate appreciation: | Loans, financing and debentures      
Composition of balances in foreign currency and sensitivity analysis      
Financial assets R$ (204,552) $ (38,223)  
USD | Risk of exchange rate appreciation: | Receivables ENBPAR      
Composition of balances in foreign currency and sensitivity analysis      
Financial assets R$ (204,552) $ (38,223)  
EURO      
Foreign exchange rates      
Assumed foreign exchange rate 5.35 5.35  
Scenario I - Likely | Risk of exchange rate appreciation:      
Composition of balances in foreign currency and sensitivity analysis      
Effect on profit/loss - revenue (expense)- Foreign currency sensitivity analysis R$ (5,290)    
Scenario I - Likely | USD | Risk of exchange rate appreciation: | Loans, financing and debentures      
Composition of balances in foreign currency and sensitivity analysis      
Effect on profit/loss - revenue (expense)- Foreign currency sensitivity analysis (5,290)    
Scenario I - Likely | USD | Risk of exchange rate appreciation: | Receivables ENBPAR      
Composition of balances in foreign currency and sensitivity analysis      
Effect on profit/loss - revenue (expense)- Foreign currency sensitivity analysis R$ (5,290)    
Scenario I - Likely | EURO      
Foreign exchange rates      
Assumed foreign exchange rate 5.49 5.49  
Scenario (25%) | Risk of exchange rate appreciation:      
Composition of balances in foreign currency and sensitivity analysis      
Effect on profit/loss - revenue (expense)- Foreign currency sensitivity analysis R$ (57,751)    
Scenario (25%) | USD | Risk of exchange rate appreciation: | Loans, financing and debentures      
Composition of balances in foreign currency and sensitivity analysis      
Effect on profit/loss - revenue (expense)- Foreign currency sensitivity analysis (57,751)    
Scenario (25%) | USD | Risk of exchange rate appreciation: | Receivables ENBPAR      
Composition of balances in foreign currency and sensitivity analysis      
Effect on profit/loss - revenue (expense)- Foreign currency sensitivity analysis R$ (57,751)    
Scenario (25%) | EURO      
Foreign exchange rates      
Assumed foreign exchange rate 6.86 6.86  
Scenario (50%) | Risk of exchange rate appreciation:      
Composition of balances in foreign currency and sensitivity analysis      
Effect on profit/loss - revenue (expense)- Foreign currency sensitivity analysis R$ (110,211)    
Scenario (50%) | USD | Risk of exchange rate appreciation: | Loans, financing and debentures      
Composition of balances in foreign currency and sensitivity analysis      
Effect on profit/loss - revenue (expense)- Foreign currency sensitivity analysis (110,211)    
Scenario (50%) | USD | Risk of exchange rate appreciation: | Receivables ENBPAR      
Composition of balances in foreign currency and sensitivity analysis      
Effect on profit/loss - revenue (expense)- Foreign currency sensitivity analysis R$ (110,211)    
Scenario (50%) | EURO      
Foreign exchange rates      
Assumed foreign exchange rate 8.24 8.24