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20 Accounts payable to suppliers (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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DisclosureOfAccountsPayableToSuppliersLineItems [Line Items] |  |
Suppliers | R$ 1,873,193 | R$ 1,469,199
Suppliers, current | 1,685,280 | 1,419,243
Suppliers, noncurrent | 187,913 | 49,956
Energy supplies [Member] |  |
DisclosureOfAccountsPayableToSuppliersLineItems [Line Items] |  |
Suppliers | 1,085,777 | 819,792
Materials And Supplies [Member] |  |
DisclosureOfAccountsPayableToSuppliersLineItems [Line Items] |  |
Suppliers | 520,647 | 384,300
Natural gas for resale [Member] |  |
DisclosureOfAccountsPayableToSuppliersLineItems [Line Items] |  |
Suppliers | 79,174 | 95,478
Charges for use of grid system [Member] |  |
DisclosureOfAccountsPayableToSuppliersLineItems [Line Items] |  |
Suppliers | R$ 187,595 | R$ 169,629

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- Definition The non-current amount of payment due to suppliers for goods and services used in the entity's business. [Refer: Trade payables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The current amount of payment due to suppliers for goods and services used in entity's business. [Refer: Current liabilities; Trade payables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 70 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_70&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of payment due to suppliers for goods and services used in the entity's business. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78&doctype=Standard -URIDate 2019-03-27 + Details
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