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OPERATING EXPENSES - Provisions or Operational Reversals (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
OPERATING COSTS AND EXPENSES      
Reversal (provision) for litigation R$ 1,246,332 R$ (1,857,566) R$ (13,080,540)
Estimated losses on investments 106,821 92,226 (20,712)
Payment through shares 38,988 (101,813) (107,652)
Onerous contracts (862,029) 229,582 16,219
Impairment (956,492) (267,815) 475,406
Restitution to the RGR Fund (e) (558,360)    
Measurement at fair value of the asset held for sale (704,467)    
Provision for judicial deposits     (233,908)
Provision for unsecured liabilities     (705,864)
Others (303,631) (957) (237,770)
Operating Charges (Reversals), Net (2,481,054) (6,928,425) (14,922,063)
Generation      
OPERATING COSTS AND EXPENSES      
Constitutions to onerous contracts provision 862,029 61,977  
Generation | Jirau Energia      
OPERATING COSTS AND EXPENSES      
Constitutions to onerous contracts provision 729,536    
Compulsory Loan      
OPERATING COSTS AND EXPENSES      
Reductions obtained for agreements that have already been signed 1,954,876    
Eolica Coxilha Negra And UHE Samuel      
OPERATING COSTS AND EXPENSES      
Reduction of the recoverable value 853,812    
Financing and Loans      
OPERATING COSTS AND EXPENSES      
ECL (21,618) (3,347,749) (638,894)
Consumers and resellers      
OPERATING COSTS AND EXPENSES      
ECL R$ (466,598) R$ (1,674,333) 110,282
Fuel consumption      
OPERATING COSTS AND EXPENSES      
ECL     R$ (498,630)