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Schedule of financial results (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Financial income R$ 932,049 R$ 1,839,668 R$ 729,506
Financial expenses 1,259,410 973,397 1,184,870
Financial expenses 1,259,410 973,397 1,184,870
Financial result, net (327,361) 866,271 (455,364)
Arrears Charges On Energy Bills [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 326,217 271,966 215,522
Interest And Monetary Variation Of C R C Transfer Expense [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 255,777 341,964 192,724
Return On Financial Investments [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 163,888 80,704 119,622
Remuneration Of Net Sectorial Assets And Liabilities Expense [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 35,902 20,168 47,378
Monetary Variation Over The Itaipu Power Purchase [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 30,043 42,729 26,332
Recognition Of Tax Credit [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 21,640 944,549 38,434
Exchange Variation On Loan Collateral [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 9,243 35,089
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 5,373 2,322 1,462
Derivatives Fair Value Forward Contract [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 24,511
Financial expenses 20,401 1,203
Other Financial Income [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 125,594 160,100 121,283
Pis Pasep And Cofins Taxes On Interes On Capital [Member]      
IfrsStatementLineItems [Line Items]      
Financial income (41,628) (84,434) (33,251)
Monetary And Cambial Variation And Debt Charges [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 855,814 607,569 853,880
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession Expense [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 200,629 192,848 100,455
Monetary Variation Over The Itaipu Power Purchase Expense [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 58,814 75,478 29,547
P I S Pasep Cofins Taxes On Interest On Capital [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 34,382 27,748 71,549
Interest On R And D And E E P [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 14,814 12,550 24,570
Remuneration Of Net Sectorial Assets And Liabilities [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 3,744 62 5,753
Interest And Monetary Variation Of C R C Transfer [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 1,787 8,495
Other Financial Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses R$ 69,025 R$ 57,142 R$ 89,418