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20 Accounts Payable to Suppliers (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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DisclosureOfAccountsPayableToSuppliersLineItems [Line Items] |  |
Suppliers | R$ 2,436,452 | R$ 1,873,193
Suppliers, current | 2,291,307 | 1,685,280
Suppliers, noncurrent | 145,145 | 187,913
Energy supplies [member] |  |
DisclosureOfAccountsPayableToSuppliersLineItems [Line Items] |  |
Suppliers | 1,393,899 | 1,085,777
Materials And Supplies [member] |  |
DisclosureOfAccountsPayableToSuppliersLineItems [Line Items] |  |
Suppliers | 671,458 | 520,647
Natural gas for resale [member] |  |
DisclosureOfAccountsPayableToSuppliersLineItems [Line Items] |  |
Suppliers | 38,574 | 79,174
Charges for use of grid system [member] |  |
DisclosureOfAccountsPayableToSuppliersLineItems [Line Items] |  |
Suppliers | R$ 332,521 | R$ 187,595

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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 2020-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 70 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_70&doctype=Standard -URIDate 2020-01-01 + Details
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