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27. REVENUE (Details 1)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
BRL (R$)
GW
Dec. 31, 2019
BRL (R$)
GW
Dec. 31, 2018
BRL (R$)
GW
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW [1] 39,368 42,176 43,522
Own consumption | GW [1] 34 38 41
Unbilled revenue | GW [1]    
Supply of electricity including own consumption and not invoiced | GW [1] 39,402 42,214 43,563
Wholesale supply to other concession holders | GW [1] 13,907 [2] 11,920 [2] 11,992
Wholesale supply unbilled, net | GW [1]   0
Total | GW [1] 53,309 54,134 55,555
Revenue from sale of electricity | R$ R$ 23,009 R$ 23,918 R$ 21,834
Own consumption | R$   0 0
Unbilled revenue | R$ 9 134 48
Supply of electricity including own consumption and not invoiced | R$ 23,018 24,052 21,882
Wholesale supply to other concession holders | R$ [2] 3,363 2,943 3,002
Wholesale supply unbilled, net | R$ 51 (67) (12)
Revenue from sale of electricity | R$ R$ 26,432 R$ 26,927 R$ 24,872
Residential [member] | Electricity distribution [member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 10,981 [1] 10,538 [1] 10,267 [3]
Revenue from sale of electricity | R$ R$ 9,875 R$ 9,668 R$ 8,658
Industrial [member] | Electricity distribution [member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 12,731 [1] 14,873 [1] 17,689 [3]
Revenue from sale of electricity | R$ R$ 4,171 R$ 4,760 R$ 4,892
Commercial, services and others [member] | Electricity distribution [member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 8,571 [1] 9,335 [1] 8,380 [3]
Revenue from sale of electricity | R$ R$ 4,979 R$ 5,439 R$ 4,683
Rural [member] | Electricity distribution [member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 3,766 [1] 3,795 [1] 3,615 [3]
Revenue from sale of electricity | R$ R$ 2,190 R$ 2,058 R$ 1,794
Public authorities [member] | Electricity distribution [member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 714 [1] 905 [1] 871 [3]
Revenue from sale of electricity | R$ R$ 522 R$ 654 R$ 575
Public lighting [member] | Electricity distribution [member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 1,243 [1] 1,357 [1] 1,384 [3]
Revenue from sale of electricity | R$ R$ 550 R$ 614 R$ 585
Public services [member] | Electricity distribution [member]      
Disclosure of revenue [line items]      
Supply of electricity in GWh | GW 1,362 [1] 1,373 [1] 1,316 [3]
Revenue from sale of electricity | R$ R$ 722 R$ 725 R$ 646
[1] Data not reviewed 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.
[3] Data not audited by external auditors.