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28. OPERATING COSTS AND EXPENSES (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale R$ 12,111 R$ 11,286 [1] R$ 11,084
Supply from itaipu binacional [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 1,990 1,429 1,351
Physical guarantee quota contracts [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 780 715 679
Quotas for Angra I and II nuclear plants [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 303 269 267
Spot market [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 1,497 1,886 1,818
Proinfa program [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 318 376 324
Bilateral contracts [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 333 311 484
Energy acquired in regulated market auctions [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 3,334 3,021 3,346
Energy acquired in the free market [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 3,977 4,098 3,871
Distributed generation ('geracao distribuida') [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale 678 207
PIS/pasep and cofins credits [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Energy purchased for resale R$ (1,099) R$ (1,026) R$ (1,056)
[1] See note 2.8.