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33 Financial Results (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income | R$ 1,839,668 |  |
Financial expenses | 973,397 |  |
Financial result, net | 866,271 |  |
Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income |  | R$ 729,506 | R$ 797,107
Financial expenses |  | 1,184,870 | 1,210,252
Financial result, net |  | (455,364) | (413,145)
Recognition Of Tax Credit [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income | 944,549 |  |
Recognition Of Tax Credit [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income |  | 38,434 | 55,096
Interest And Monetary Variation Of CRC Transfer Expense [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income | 341,964 |  |
Interest And Monetary Variation Of CRC Transfer Expense [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income |  | 192,724 | 214,627
Arrears Charges On Bills [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income | 271,966 |  |
Arrears Charges On Bills [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income |  | 215,522 | 210,466
Return On Financial Investments [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income | 80,704 |  |
Return On Financial Investments [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income |  | 119,622 | 98,424
Exchange variation on loan collateral [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income | 35,089 |  |
Exchange variation on loan collateral [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income |  |  |
Derivatives fair value - forward contract [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income | 24,511 |  |
Derivatives fair value - forward contract [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income |  |  |
Remuneration Of Net Sectorial Assets And Liabilities Expense [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income | 20,168 |  |
Remuneration Of Net Sectorial Assets And Liabilities Expense [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income |  | 47,378 | 43,966
Monetary Variation Over The Ltaipu Power Purchase [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income | 42,729 |  |
Monetary Variation Over The Ltaipu Power Purchase [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income |  | 26,332 | 24,658
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income | 2,322 |  |
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income |  | 1,462 | 1,047
Other Financial Income [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income | 75,666 |  |
Other Financial Income [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial income |  | 88,032 | 148,823
Monetary And Exchange Variation And Debt Charges [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses | 607,569 |  |
Monetary And Exchange Variation And Debt Charges [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses |  | 853,880 | 829,728
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession Expense [member]r |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses | 192,848 |  |
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession Expense [member]r | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses |  | 100,455 | 94,319
Monetary Variation Over The Itaipu Power Purchase Expense [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses | 75,478 |  |
Monetary Variation Over The Itaipu Power Purchase Expense [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses |  | 29,547 | 50,203
Interest on R&D and EEP [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses | 12,550 |  |
Interest on R&D and EEP [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses |  | 24,570 | 25,407
Remuneration Of Net Sectorial Assets And Liabilities [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses | 62 |  |
Remuneration Of Net Sectorial Assets And Liabilities [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses |  | 5,753 | 23,747
Interest And Monetary Variation Of CRC Transfer [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses |  |  |
Interest And Monetary Variation Of CRC Transfer [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses |  | 8,495 | 25,830
PIS/Pasep/Cofins Taxes On Interest On Capital [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses | 27,748 |  |
PIS/Pasep/Cofins Taxes On Interest On Capital [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses |  | 71,549 | 13,636
Other Financial Expenses [member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses | R$ 57,142 |  |
Other Financial Expenses [member] | Restated [Member] |  |  |
DisclosureOfFinancialResultsLineItems [Line Items] |  |  |
Financial expenses |  | R$ 90,621 | R$ 147,382

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