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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