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37 Commitments (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2019	Dec. 31, 2018
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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The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2019-03-27

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