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13 Taxes (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | R$ 2,068,337 | R$ 2,047,358 |
Noncurrent assets, recognized in income |  | 189,724 | (48,702) |
Noncurrent assets, business combination effect |  | (81,971) | 6,237 |
Noncurrent assets, recognized comprehensive income |  | 92,190 | 63,444 |
Noncurrent assets, ending |  | 2,268,280 | 2,068,337 |
Noncurrent liabilities, beginning |  | 1,350,137 | 1,197,717 |
Noncurrent liabilities, recognized in income |  | 214,620 | 153,446 |
Noncurrent liabilities, reclassification |  | (3,243) |  |
Noncurrent liabilities, business combination effect |  |  | (1,026) |
Noncurrent liabilities, recognized comprehensive income |  |  |  |
Noncurrent liabilities, ending |  | 1,561,514 | 1,350,137 |
Net, beginning |  | 718,200 | 849,641 |
Net, recognized in income |  | (24,896) | (202,148) |
Net, reclassification |  | (78,728) |  |
Net, business combination effect |  |  | 7,263 |
Net, recognized comprehensive income |  | 92,190 | 63,444 |
Net, ending |  | 706,766 | 718,200 |
Assets presented in the Statement of Financial Position |  | 1,191,104 | 1,011,866 | R$ 1,007,061
Liabilities presented in the Statement of Financial Position |  | 484,338 | 293,666 | R$ 157,420
Provisions for Legal Claims [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 516,752 | 573,177 |
Noncurrent assets, recognized in income |  | (6,072) | (62,662) |
Noncurrent assets, reclassification |  |  |  |
Noncurrent assets, business combination effect |  |  | 6,237 |
Noncurrent assets, recognized comprehensive income |  |  |  |
Noncurrent assets, ending |  | 510,680 | 516,752 |
Post Employment Benefits [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 405,414 | 328,685 |
Noncurrent assets, recognized in income |  | 9,433 | 13,285 |
Noncurrent assets, reclassification |  |  |  |
Noncurrent assets, business combination effect |  |  |  |
Noncurrent assets, recognized comprehensive income |  | 92,190 | 63,444 |
Noncurrent assets, ending |  | 507,037 | 405,414 |
Impairment of Assets [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 385,467 | 328,011 |
Noncurrent assets, recognized in income |  | (63,827) | 57,456 |
Noncurrent assets, reclassification |  |  |  |
Noncurrent assets, business combination effect |  |  |  |
Noncurrent assets, recognized comprehensive income |  |  |  |
Noncurrent assets, ending |  | 321,640 | 385,467 |
Research and Development and Energy Efficiency Programs [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 165,331 | 154,491 |
Noncurrent assets, recognized in income |  | (12,833) | 10,840 |
Noncurrent assets, reclassification |  |  |  |
Noncurrent assets, business combination effect |  |  |  |
Noncurrent assets, recognized comprehensive income |  |  |  |
Noncurrent assets, ending |  | 152,498 | 165,331 |
Tax Losses and Negative Tax Basis [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 98,242 | 71,140 |
Noncurrent assets, recognized in income |  | 144,493 | 27,102 |
Noncurrent assets, reclassification |  |  |  |
Noncurrent assets, business combination effect |  |  |  |
Noncurrent assets, recognized comprehensive income |  |  |  |
Noncurrent assets, ending |  | 242,735 | 98,242 |
Provision for Energy Purchases [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 18,039 | 155,570 |
Noncurrent assets, recognized in income |  |  | (137,531) |
Noncurrent assets, reclassification |  |  |  |
Noncurrent assets, business combination effect |  |  |  |
Noncurrent assets, recognized comprehensive income |  |  |  |
Noncurrent assets, ending |  | 18,039 | 18,039 |
Provision for Performance And Profit Sharing [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 52,115 | 30,548 |
Noncurrent assets, recognized in income |  | 109,622 | 21,567 |
Noncurrent assets, reclassification |  |  |  |
Noncurrent assets, business combination effect |  |  |  |
Noncurrent assets, recognized comprehensive income |  |  |  |
Noncurrent assets, ending |  | 161,737 | 52,115 |
Amortization - concession [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 58,344 | 53,339 |
Noncurrent assets, recognized in income |  | (11,135) | 5,005 |
Noncurrent assets, reclassification |  |  |  |
Noncurrent assets, business combination effect |  |  |  |
Noncurrent assets, recognized comprehensive income |  |  |  |
Noncurrent assets, ending |  | 47,209 | 58,344 |
Concession Contracts [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 22,353 | 23,606 |
Noncurrent assets, recognized in income |  | (1,292) | (1,253) |
Noncurrent assets, reclassification |  |  |  |
Noncurrent assets, business combination effect |  |  |  |
Noncurrent assets, recognized comprehensive income |  |  |  |
Noncurrent assets, ending |  | 21,061 | 22,353 |
Noncurrent liabilities, beginning |  | 711,831 | 613,658 |
Noncurrent liabilities, recognized in income |  | 188,674 | 99,199 |
Noncurrent liabilities, reclassification |  |  |  |
Noncurrent liabilities, business combination effect |  |  | (1,026) |
Noncurrent liabilities, recognized comprehensive income |  |  |  |
Noncurrent liabilities, ending |  | 900,505 | 711,831 |
Reclassification [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning | [1] |  |  |
Noncurrent assets, recognized in income | [1] | (1,771) |  |
Noncurrent assets, reclassification | [1] | (81,971) |  |
Noncurrent assets, recognized comprehensive income | [1] |  |  |
Noncurrent assets, ending | [1] | (83,742) |  |
Noncurrent liabilities, beginning | [1] |  |  |
Noncurrent liabilities, recognized in income | [1] | 478 |  |
Noncurrent liabilities, reclassification | [1] | (3,243) |  |
Noncurrent liabilities, recognized comprehensive income | [1] |  |  |
Noncurrent liabilities, ending | [1] | (2,765) |  |
Expected Credit Losses [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 131,821 | 114,010 |
Noncurrent assets, recognized in income |  | (2,868) | 17,811 |
Noncurrent assets, business combination effect |  |  |  |
Noncurrent assets, recognized comprehensive income |  |  |  |
Noncurrent assets, ending |  | 128,953 | 131,821 |
Social Security Contributions - Injunction on Judicial Deposit [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 71,200 | 67,010 |
Noncurrent assets, recognized in income |  | 3,340 | 4,190 |
Noncurrent assets, reclassification |  |  |  |
Noncurrent assets, business combination effect |  |  |  |
Noncurrent assets, recognized comprehensive income |  |  |  |
Noncurrent assets, ending |  | 74,540 | 71,200 |
Other [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent assets, beginning |  | 143,259 | 147,771 |
Noncurrent assets, recognized in income |  | 22,634 | (4,512) |
Noncurrent assets, business combination effect |  |  |  |
Noncurrent assets, recognized comprehensive income |  |  |  |
Noncurrent assets, ending |  | 165,893 | 143,259 |
Noncurrent liabilities, beginning |  | 42,577 | 35,728 |
Noncurrent liabilities, recognized in income |  | (10,626) | 6,849 |
Noncurrent liabilities, reclassification |  |  |  |
Noncurrent liabilities, business combination effect |  |  |  |
Noncurrent liabilities, recognized comprehensive income |  |  |  |
Noncurrent liabilities, ending |  | 31,951 | 42,577 |
Deemed cost [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent liabilities, beginning |  | 381,209 | 415,325 |
Noncurrent liabilities, recognized in income |  | (30,718) | (34,116) |
Noncurrent liabilities, reclassification |  |  |  |
Noncurrent liabilities, business combination effect |  |  |  |
Noncurrent liabilities, recognized comprehensive income |  |  |  |
Noncurrent liabilities, ending |  | 350,491 | 381,209 |
Derivative financial instruments [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent liabilities, beginning |  | 70,945 | 5,030 |
Noncurrent liabilities, recognized in income |  | 46,737 | 65,915 |
Noncurrent liabilities, reclassification |  |  |  |
Noncurrent liabilities, business combination effect |  |  |  |
Noncurrent liabilities, recognized comprehensive income |  |  |  |
Noncurrent liabilities, ending |  | 117,682 | 70,945 |
Transaction Cost On Borrowings and Debentures [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent liabilities, beginning |  | 32,108 | 31,127 |
Noncurrent liabilities, recognized in income |  | (7,539) | 981 |
Noncurrent liabilities, reclassification |  |  |  |
Noncurrent liabilities, business combination effect |  |  |  |
Noncurrent liabilities, recognized comprehensive income |  |  |  |
Noncurrent liabilities, ending |  | 24,569 | 32,108 |
Escrow Deposits Monetary Variation [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent liabilities, beginning |  | 61,145 | 64,167 |
Noncurrent liabilities, recognized in income |  | 1,981 | (3,022) |
Noncurrent liabilities, reclassification |  |  |  |
Noncurrent liabilities, business combination effect |  |  |  |
Noncurrent liabilities, recognized comprehensive income |  |  |  |
Noncurrent liabilities, ending |  | 63,126 | 61,145 |
Accelerated Depreciation [member] |  |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |  |
Noncurrent liabilities, beginning |  | 50,322 | 32,682 |
Noncurrent liabilities, recognized in income |  | 25,633 | 17,640 |
Noncurrent liabilities, reclassification |  |  |  |
Noncurrent liabilities, business combination effect |  |  |  |
Noncurrent liabilities, recognized comprehensive income |  |  |  |
Noncurrent liabilities, ending |  | R$ 75,955 | R$ 50,322 |
[1] | Reclassification to Assets classified as held for sale (Note 40).

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