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13 Taxes (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | R$ 2,047,358 | R$ 1,882,616 |
Noncurrent assets, recognized in income | (48,084) | 132,578 |
Noncurrent assets, effects of applying new IFRS |  | 8,474 |
Noncurrent assets, business combination effect | 6,237 | 3,696 |
Noncurrent assets, recognized in other comprehensive income | 63,444 | 19,994 |
Noncurrent assets, ending | 2,068,955 | 2,047,358 |
Noncurrent liabilities, beginning | 1,197,717 |  |
Noncurrent liabilities, recognized in income | 154,064 | 1,123,754 |
Noncurrent liabilities, effects of applying new IFRS |  | 64,506 |
Noncurrent liabilities, business combination effect | (1,026) |  |
Noncurrent liabilities, recognized in other comprehensive income |  | 9,457 |
Noncurrent liabilities, ending | 1,350,755 | 1,197,717 |
Net | 849,641 | 758,862 |
Total, recognized in income | (202,148) | 68,072 |
Total, effects of applying new IFRS |  | 8,474 |
Total, business combination effect | 7,263 | (5,761) |
Total, recognized in other comprehensive income | 63,444 | 19,994 |
Total | 718,200 | 849,641 |
Assets presented in the Statement of Financial Position | 1,011,866 | 1,007,061 | R$ 915,492
Liabilities presented in the Statement of Financial Position | 293,666 | 157,420 | R$ (156,630)
Provisions for Legal Claims [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 573,177 | 514,358 |
Noncurrent assets, recognized in income | (62,044) | 55,123 |
Noncurrent assets, business combination effect | 6,237 | 3,696 |
Noncurrent assets, ending | 517,370 | 573,177 |
Post Employment Benefits [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 328,685 | 293,611 |
Noncurrent assets, recognized in income | 13,285 | 15,080 |
Noncurrent assets, recognized in other comprehensive income | 63,444 | 19,994 |
Noncurrent assets, ending | 405,414 | 328,685 |
Impairment of Assets [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 328,011 | 310,561 |
Noncurrent assets, recognized in income | 57,456 | 17,450 |
Noncurrent assets, ending | 385,467 | 328,011 |
Provision for Energy Purchases [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 154,491 | 156,325 |
Noncurrent assets, recognized in income | 10,840 | (1,834) |
Noncurrent assets, ending | 165,331 | 154,491 |
Expected Credit Losses [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 114,010 | 113,380 |
Noncurrent assets, recognized in income | 17,811 | (6,838) |
Noncurrent assets, effects of applying new IFRS |  | 7,468 |
Noncurrent assets, ending | 131,821 | 114,010 |
Tax Losses and Negative Tax Basis [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 71,140 | 110,658 |
Noncurrent assets, recognized in income | 27,102 | (39,518) |
Noncurrent assets, ending | 98,242 | 71,140 |
Social Security Contributions - Injunction on Judicial Deposit [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 67,010 | 60,856 |
Noncurrent assets, recognized in income | 4,190 | 6,154 |
Noncurrent assets, ending | 71,200 | 67,010 |
Concession Contracts [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 53,339 | 48,722 |
Noncurrent assets, recognized in income | 5,005 | 4,617 |
Noncurrent assets, ending | 58,344 | 53,339 |
Noncurrent liabilities, beginning | 613,658 |  |
Noncurrent liabilities, recognized in income | 99,817 |  |
Noncurrent liabilities, business combination effect | (1,026) |  |
Noncurrent liabilities, ending | 712,449 | 613,658 |
Provision for Profit Sharing [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 30,548 | 22,270 |
Noncurrent assets, recognized in income | 21,567 | 8,278 |
Noncurrent assets, ending | 52,115 | 30,548 |
Concession Contracts [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 23,606 | 24,906 |
Noncurrent assets, recognized in income | (1,253) | (1,300) |
Noncurrent assets, ending | 22,353 | 23,606 |
Noncurrent liabilities, beginning |  | 535,726 |
Noncurrent liabilities, recognized in income |  | 68,475 |
Noncurrent liabilities, business combination effect |  | 9,457 |
Research and Development and Energy Efficiency Programs [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 155,570 | 129,877 |
Noncurrent assets, recognized in income | (137,531) | 25,693 |
Noncurrent assets, ending | 18,039 | 155,570 |
Others [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning |  | 97,092 |
Noncurrent assets, recognized in income |  | 49,673 |
Noncurrent assets, effects of applying new IFRS |  | 1,006 |
Noncurrent liabilities, beginning |  | 34,877 |
Noncurrent liabilities, recognized in income |  | 851 |
Deemed Cost [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent liabilities, beginning | 415,325 | 449,884 |
Noncurrent liabilities, recognized in income | (34,116) | (34,559) |
Noncurrent liabilities, ending | 381,209 | 415,325 |
Financial Instruments [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent liabilities, beginning | 5,030 |  |
Noncurrent liabilities, recognized in income | 65,915 | 5,030 |
Noncurrent liabilities, ending | 70,945 | 5,030 |
Escrow Deposits Monetary Variation [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent liabilities, beginning | 64,167 | 55,328 |
Noncurrent liabilities, recognized in income | (3,022) | 8,839 |
Noncurrent liabilities, ending | 61,145 | 64,167 |
Accelerated Depreciation [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent liabilities, beginning | 32,682 | 26,401 |
Noncurrent liabilities, recognized in income | 17,640 | 6,281 |
Noncurrent liabilities, ending | 50,322 | 32,682 |
Transaction Cost On Borrowings and Debentures [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent liabilities, beginning | 31,127 | 21,538 |
Noncurrent liabilities, recognized in income | 981 | 9,589 |
Noncurrent liabilities, ending | 32,108 | 31,127 |
Other [Member] |  |  |
DisclosureOfChangesInDeferredIncomeTaxAndSocialContributionLineItems [Line Items] |  |  |
Noncurrent assets, beginning | 147,771 |  |
Noncurrent assets, recognized in income | (4,512) |  |
Noncurrent assets, ending | 143,259 | 147,771 |
Noncurrent liabilities, beginning | 35,728 |  |
Noncurrent liabilities, recognized in income | 6,849 |  |
Noncurrent liabilities, ending | R$ 42,577 | R$ 35,728 |

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