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31 Net Operating Revenue (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | R$ 25,227,782 | R$ 23,725,810 | R$ 21,574,289
PIS/Pasep and Cofins | (2,161,120) | (2,117,800) | (1,788,714)
ICMS (VAT) | (4,656,686) | (4,210,382) | (3,734,940)
Sectorial charges | (2,161,811) | 2,457,562 | (2,020,674)
Service tax (ISSQN) | (3,891) | (5,286) | (5,388)
Net operating revenues | 16,244,274 | 14,934,780 | 14,024,573
Electricity Sales To Final Customers [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 10,481,794 | 10,104,045 | 8,689,516
PIS/Pasep and Cofins | (965,651) |  |
ICMS (VAT) | (2,336,583) |  |
Sectorial charges | (753,544) |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 6,426,016 | 5,548,584 | 4,681,533
Electricity Sales To Distributors [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 3,301,336 | 3,136,244 | 3,529,770
PIS/Pasep and Cofins | (368,101) |  |
ICMS (VAT) | (10,727) |  |
Sectorial charges | (56,642) |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 2,865,866 | 3,136,244 | 3,176,354
Use Of The Main Distribution and Transmission Grid [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 8,270,996 | 3,469,060 | 6,442,761
PIS/Pasep and Cofins | (781,017) |  |
ICMS (VAT) | (1,999,583) |  |
Sectorial charges | (1,351,625) |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 4,138,771 |  | 3,617,941
Construction Income [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 1,132,884 | 1,097,313 | 868,001
PIS/Pasep and Cofins |  |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 1,132,884 | 1,097,313 | 868,001
Fair Value Of Assets From The Indemnity For The Concession [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 36,646 | 47,499 | 57,080
PIS/Pasep and Cofins |  |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 36,646 | 47,499 | 57,080
Telecommunications [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 532,926 | 512,540 | 426,773
PIS/Pasep and Cofins | (21,035) |  |
ICMS (VAT) | (137,896) |  |
Sectorial charges |  |  |
Service tax (ISSQN) | (558) |  |
Net operating revenues | 373,437 | 512,540 | 308,952
Distribution Of Piped Gas [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 1,003,790 | 753,222 | 621,992
PIS/Pasep and Cofins | 11,313 |  |
ICMS (VAT) | (171,897) |  |
Sectorial charges |  |  |
Service tax (ISSQN) | (23) |  |
Net operating revenues | 843,183 | 557,186 | 454,815
Sectorial Financial Assets and Liabilities Result [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 25,057 | 985,344 | 767,040
PIS/Pasep and Cofins | (6,426) |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 18,631 | 893,688 | 718,826
Other Operating Revenue [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 442,353 | 222,329 | 171,356
PIS/Pasep and Cofins | (30,203) |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) | (3,310) |  |
Net operating revenues | R$ 408,840 | R$ 189,355 | R$ 141,071

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