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37. Commitments (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Energy purchase and transportation contracts
DisclosureOfCommitmentsLineItems [Line Items]
Commitments	R$ 140,638,024	R$ 118,588,046
Construction of transmission lines and substations
DisclosureOfCommitmentsLineItems [Line Items]
Commitments	214,086	292,601
Construction of HPP Colíder power plant
DisclosureOfCommitmentsLineItems [Line Items]
Commitments	36,303	42,653
Construction of HPP Baixo Iguaçu
DisclosureOfCommitmentsLineItems [Line Items]
Commitments	202,668	193,156
Construction of Cutia wind farm
DisclosureOfCommitmentsLineItems [Line Items]
Commitments	40,392	701,191
Telecommunications works
DisclosureOfCommitmentsLineItems [Line Items]
Commitments	115,710	131,557
Acquisition of assets for electricity distribution
DisclosureOfCommitmentsLineItems [Line Items]
Commitments	528,109	161,337
Gas purchase contracts
DisclosureOfCommitmentsLineItems [Line Items]
Commitments	R$ 1,339,848	R$ 2,346,046

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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 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

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