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RECEIVABLES FROM CUSTOMERS (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Billed supply R$ 3,240 R$ 3,410
Unbilled supply 1,244 930
Other concession holders - wholesale supply 67 52
Other concession holders - wholesale supply, unbilled 369 265
CCEE (Power Trading Chamber) 162 169
Concession Holders - power transport 180 170
Concession Holders - power transport, unbilled 370 319
Provision for doubtful receivables (820) (833)
Trade and other receivables 4,812 4,482
Current assets 4,769 4,430
Non-current assets 43 R$ 52
Balances Not Yet Due [member]    
IfrsStatementLineItems [Line Items]    
Billed supply 1,415  
Unbilled supply 1,244  
Other concession holders - wholesale supply 22  
Other concession holders - wholesale supply, unbilled 369  
CCEE (Power Trading Chamber) 33  
Concession Holders - power transport 53  
Concession Holders - power transport, unbilled 370  
Provision for doubtful receivables (146)  
Trade and other receivables 3,360  
Not later than three months [member]    
IfrsStatementLineItems [Line Items]    
Billed supply 568  
Unbilled supply  
Other concession holders - wholesale supply 45  
Other concession holders - wholesale supply, unbilled  
CCEE (Power Trading Chamber) 121  
Concession Holders - power transport 18  
Concession Holders - power transport, unbilled  
Provision for doubtful receivables (87)  
Trade and other receivables 665  
Later than three months and not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Billed supply 642  
Unbilled supply  
Other concession holders - wholesale supply  
Other concession holders - wholesale supply, unbilled  
CCEE (Power Trading Chamber) 7  
Concession Holders - power transport 22  
Concession Holders - power transport, unbilled  
Provision for doubtful receivables (112)  
Trade and other receivables 559  
More Than One Year [member]    
IfrsStatementLineItems [Line Items]    
Billed supply 615  
Unbilled supply  
Other concession holders - wholesale supply  
Other concession holders - wholesale supply, unbilled  
CCEE (Power Trading Chamber) 1  
Concession Holders - power transport 87  
Concession Holders - power transport, unbilled  
Provision for doubtful receivables (475)  
Trade and other receivables R$ 228