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INCOME TAX AND SOCIAL CONTRIBUTION - Deferred income tax and social contributions by category (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets R$ 14,776,806 R$ 11,015,908
Deferred tax liabilities 13,773,548 13,769,093
Deferred Tax liabilities (1,003,258) 2,753,185
Tax losses    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 6,052,988 3,646,840
Actuarial Liabiliites    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 743,519 840,125
Provision for Contingencies    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 2,157,555 2,128,232
Loss Credits    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 1,313,871 1,224,987
Provisions for non-operating losses    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 367,520 474,198
Estimated losses on investments    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 31,177 166,027
Concession agreements    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 743,636 447,521
Deferred tax liabilities 1,346,608 1,167,038
Provision for Construction Cost    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 831,931 323,040
Impairment    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 1,149,637 737,282
Provisions for Voluntary Dismissal Program    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 125,642 169,059
Provision for onerous contracts    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 270,435 72,935
Other    
Temporary difference unused tax losses and unused tax credits    
Deferred tax liabilities 1,062,096 763,884
Contractual asset    
Temporary difference unused tax losses and unused tax credits    
Deferred tax liabilities 9,498,301 9,770,896
Renegotiation of hydrological risk    
Temporary difference unused tax losses and unused tax credits    
Deferred tax liabilities 580,402 873,629
Reversion of Construction Cost    
Temporary difference unused tax losses and unused tax credits    
Deferred tax liabilities 540,812 472,999
FVOCI Financial Instruments    
Temporary difference unused tax losses and unused tax credits    
Deferred tax liabilities 440,834 427,390
Accelerated depreciation    
Temporary difference unused tax losses and unused tax credits    
Deferred tax liabilities 304,495 293,257
Other    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 988,895 R$ 785,662
Madeira Energia S.A.    
Temporary difference unused tax losses and unused tax credits    
Deferred tax assets 4,521,514  
Compensation of tax losses and negative bases on future profits R$ 2,454,135