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31 Net Operating Revenue (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | R$ 25,939,794 |  |
PIS/Pasep and Cofins | (1,227,978) |  |
ICMS (VAT) | (4,216,720) |  |
Sectorial charges | (1,857,343) | R$ (2,161,811) | R$ (2,457,562)
Service tax (ISSQN) | (4,504) |  |
Net operating revenues | 18,633,249 |  |
Restated [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues |  | 24,691,379 | 23,190,729
PIS/Pasep and Cofins |  | (2,243,383) | (2,094,148)
ICMS (VAT) |  | (4,518,791) | (4,085,153)
Sectorial charges |  | (2,161,811) | (2,457,562)
Service tax (ISSQN) |  | (3,333) | (3,402)
Net operating revenues |  | 15,869,245 | 14,550,464
Electricity sales to final customers [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 9,524,897 |  |
PIS/Pasep and Cofins | (737,647) |  |
ICMS (VAT) | (1,960,998) |  |
Sectorial charges | (173,428) |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 6,652,824 |  |
Electricity sales to final customers [member] | Restated [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues |  | 10,481,794 | 10,104,045
Net operating revenues |  | 6,426,016 | 5,548,584
Electricity sales to distributors [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 4,330,982 |  |
PIS/Pasep and Cofins | (467,817) |  |
ICMS (VAT) | (21,637) |  |
Sectorial charges | (61,698) |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 3,779,830 |  |
Electricity sales to distributors [member] | Restated [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues |  | 3,301,336 | 3,136,244
Net operating revenues |  | 2,865,866 | 2,765,916
Use of the main distribution and transmission grid [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 8,780,612 |  |
PIS/Pasep and Cofins | (667,419) |  |
ICMS (VAT) | (2,118,380) |  |
Sectorial charges | (1,622,217) |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 4,372,596 |  |
Use of the main distribution and transmission grid [member] | Restated [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues |  | 8,270,996 | 6,867,274
Net operating revenues |  | 4,138,771 | 3,469,060
Construction income [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 1,414,067 |  |
PIS/Pasep and Cofins |  |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 1,414,067 |  |
Construction income [member] | Restated [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues |  | 1,132,884 | 1,097,313
Net operating revenues |  | 1,132,884 | 1,097,313
Fair value of assets from the indemnity for the concession [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 57,341 |  |
PIS/Pasep and Cofins |  |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 57,341 |  |
Fair value of assets from the indemnity for the concession [member] | Restated [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues |  | 36,646 | 47,499
Net operating revenues |  | 36,646 | 47,499
Distribution of piped gas [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 679,304 |  |
PIS/Pasep and Cofins | (60,774) |  |
ICMS (VAT) | (115,640) |  |
Sectorial charges |  |  |
Service tax (ISSQN) | (235) |  |
Net operating revenues | 502,655 |  |
Distribution of piped gas [member] | Restated [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues |  | 1,003,790 | 753,222
Net operating revenues |  | 843,183 | 557,186
Sectorial financial assets and liabilities result [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 746,052 |  |
PIS/Pasep and Cofins | (69,113) |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 676,939 |  |
Sectorial financial assets and liabilities result [member] | Restated [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues |  | 25,057 | 985,344
Net operating revenues |  | 18,631 | 893,688
Other operating revenue [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues | 406,539 |  |
PIS/Pasep and Cofins | (35,771) |  |
ICMS (VAT) | (65) |  |
Sectorial charges |  |  |
Service tax (ISSQN) | (4,269) |  |
Net operating revenues | 366,434 |  |
Other operating revenue [member] | Restated [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues |  | 438,876 | 199,788
Net operating revenues |  | 407,248 | 171,218
Recovery of pis/pasep and cofins on ICMS [member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross revenues |  |  |
PIS/Pasep and Cofins | 810,563 |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) |  |  |
Net operating revenues | R$ 810,563 |  |
Recovery of pis/pasep and cofins on ICMS [member] | Restated [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Net operating revenues |  |  |

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