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PROVISIONS FOR LITIGATION AND CONTINGENT LIABILITIES - Possible losses paragraphs - Contingent liabilities (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2015
Contingent liabilities      
Estimate loss or value involved in the legal proceeding R$ 54,055,659 R$ 47,023,866  
Civil      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 27,022,637 26,102,277  
Labor      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 2,151,677 2,297,320  
Tax      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 16,732,259 11,176,242  
Environmental      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 2,498,018 2,510,300  
Regulatory      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding 5,651,068 4,937,727  
Nullity of the trade union agreement      
Contingent liabilities      
Amount sought 1,000,000    
Insufficient collection or declaration for PIS/COFINS      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding R$ 1,801,737 R$ 1,730,503  
Chesf's contingent liability for collection of alleged losses to final consumers      
Contingent liabilities      
Estimate loss or value involved in the legal proceeding     R$ 1,471,885
Suspension request period 6 months