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29. REVENUE (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue [abstract]      
Revenue from supply of energy R$ 26,928 R$ 24,872 R$ 23,701
Revenue from use of the electricity distribution systems (TUSD) 2,722 2,045 1,611
CVA, and Other financial components 58 1,973 988
Transmission concession revenue 504 411 371
Transmission construction revenue 220 96 25
Transmission assets - indemnity revenue 156 250 373
Generation assets - indemnity revenue 55 271
Distribution construction revenue 980 802 1,094
Adjustment to expectation of cash flow from indemnifiable financial assets of distribution concession 18 9
Revenue on financial updating of the Concession Grant Fee 318 321 317
Energy transactions on the CCEE 432 217 860
Supply of gas 2,298 1,995 1,759
Fine for violation of service continuity indicator [1] (58) (44)
Recovery of PIS/Pasep and Cofins (note 10) 1,428
Other operating revenues 1,722 1,585 1,484
Deductions on revenue (12,336) (12,312) (11,151)
Net operating revenue R$ 25,390 R$ 22,266 R$ 21,712
[1] As from January 1, 2018 these amounts began to be recognized as a reduction of revenue, rather than as operational expenses, as per the change contained in IFRS 15.