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OPERATING COSTS AND EXPENSES (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Energy purchased for resale R$ 14,614 R$ 16,101 R$ 12,111
Basic network usage charges 2,671 3,337 1,748
Gas purchased for resale 2,735 2,011 1,083
Total costs of energy and gas 20,020 21,449 14,942
Supply from itaipu binacional [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 1,644 1,946 1,990
Physical guarantee quota contracts [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 925 832 780
Quotas for Angra I and II nuclear plants [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 357 244 303
Spot market [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 530 1,224 1,497
Proinfa program [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 598 401 318
Bilateral contracts [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 493 418 333
Energy acquired in regulated market auctions [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 3,334 6,242 3,334
Energy acquired in the free market [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 6,003 4,976 3,977
Distributed generation ('geracao distribuida') [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale 1,977 1,268 678
PIS/pasep and cofins credits [member]      
IfrsStatementLineItems [Line Items]      
Energy purchased for resale (1,247) (1,450) (1,099)
Basic network usage charges (304) (367) (202)
Transmission Charges Basic Grid [Member]      
IfrsStatementLineItems [Line Items]      
Basic network usage charges 2,925 3,663 1,910
Distribution Charges [Member]      
IfrsStatementLineItems [Line Items]      
Basic network usage charges R$ 50 R$ 41 R$ 40