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29. REVENUE (Details 1)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
BRL (R$)
GW
Dec. 31, 2018
BRL (R$)
GW
Dec. 31, 2017
BRL (R$)
GW
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 43,558 43,522 [1] 42,461
Own consumption | GW 38 41 [1] 37
Unbilled revenue | GW 0 0 [1] 0
Supply of electricity including own consumption and not invoiced | GW 43,596 43,563 [1] 42,498
Wholesale supply to other concession holders | GW [2] 11,448 11,992 [1] 12,777
Wholesale supply unbilled, net | GW 0 0 [1] 0
Total | GW 55,044 55,555 [1] 55,275
Revenue from sale of electricity | R$ R$ 23,918 R$ 21,834 R$ 20,378
Own consumption | R$ 0 0 0
Unbilled revenue | R$ 134 48 61
Supply of electricity including own consumption and not invoiced | R$ 24,052 21,882 20,439
Wholesale supply to other concession holders | R$ [2] 2,943 3,002 1,727
Wholesale supply unbilled, net | R$ (67) (12) 1,535
Revenue from sale of electricity | R$ R$ 26,928 R$ 24,872 R$ 23,701
Residential [Member] | Electricity distribution [Member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 10,538 10,267 [1] 10,008
Revenue from sale of electricity | R$ R$ 9,668 R$ 8,658 R$ 7,842
Industrial [Member] | Electricity distribution [Member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 16,024 17,689 [1] 17,761
Revenue from sale of electricity | R$ R$ 4,760 R$ 4,892 R$ 4,907
Commercial, Services and Other [Member] | Electricity distribution [Member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 9,567 8,380 [1] 7,507
Revenue from sale of electricity | R$ R$ 5,439 R$ 4,683 R$ 4,342
Rural [Member] | Electricity distribution [Member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 3,795 3,615 [1] 3,651
Revenue from sale of electricity | R$ R$ 2,058 R$ 1,794 R$ 1,629
Public Authorities [Member] | Electricity distribution [Member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 905 871 [1] 866
Revenue from sale of electricity | R$ R$ 654 R$ 575 R$ 532
Public Lighting [Member] | Electricity distribution [Member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 1,357 1,384 [1] 1,367
Revenue from sale of electricity | R$ R$ 614 R$ 585 R$ 537
Public Service [Member] | Electricity distribution [Member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 1,372 1,316 [1] 1,301
Revenue from sale of electricity | R$ R$ 725 R$ 646 R$ 589
[1] Data not audited by external auditors.
[2] Includes a CCEAR (Regulated Market Sales Contract), bilateral contracts with other agents, and the revenues from management of generation assets (GAG) for the 18 hydroelectric plants of Lot D of Auction no 12/2015.