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37 Commitments (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Energy Purchase and Transportation Contracts [Member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Commitments | R$ 137,279,155 | R$ 140,638,024
Construction of Transmission Grid and Substations [Member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Commitments | 115,732 | 214,086
Construction Of HPP Colider Power Plant [Member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Commitments |  | 36,303
Construction Of HPP BaixoIguacu [Member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Commitments |  | 202,668
Construction Of Cutia Wind Farm [Member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Commitments |  | 40,392
Telecommunications Works [Member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Commitments | 90,769 | 115,710
Acquisition Of Assets For Electricity Distribution [Member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Commitments | 428,441 | 528,109
Gas Purchase Contracts [Member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Commitments | 859,211 | R$ 1,339,848
Construction Of SHP Bela Vista [Member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Commitments | R$ 111,481 |

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- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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