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Financial Results (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Financial income R$ 1,032,837 R$ 932,049 R$ 895,119
Financial expenses 1,987,504 1,259,410 973,397
(-) Update of provision for destination of (954,667) (327,361) (78,278)
PIS and Cofins credits 1,011,370 944,549
Financial result, net (1,966,037) (327,361) 866,271
Return On Financial Investments [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 463,255 163,888 80,704
Arrears Charges On Energy Bills [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 274,308 326,217 271,966
Remuneration Of Net Sectorial Assets And Liabilities Expense [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 146,753 35,902 20,168
Monetary Variation Over The Itaipu Power Purchase [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 43,946 30,043 42,729
Recognition Of Tax Credit [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 33,908 21,640
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 2,720 5,373 2,322
Interest And Monetary Variation Of C R C Transfer Expense [Member]      
IfrsStatementLineItems [Line Items]      
Financial income [1] 255,777 341,964
Exchange Variation On Loan Collateral [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 9,243 35,089
Derivatives Fair Value Forward Contract [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 24,511
Financial expenses 2,907 20,401
Other Financial Income [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 109,800 125,594 160,100
Pis Pasep And Cofins Taxes On Interes On Capital [Member]      
IfrsStatementLineItems [Line Items]      
(-) Pis/Pasep and Cofins taxes on financial income (41,853) (41,628) (84,434)
Monetary And Cambial Variation And Debt Charges [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 1,479,057 855,814 607,569
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession Expense [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 142,673 200,629 192,848
P I S Pasep Cofins Taxes On Interest On Capital [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 107,720 34,382 27,748
Interest On R And D And E E P [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 34,644 14,814 12,550
Monetary Variation Over The Itaipu Power Purchase Expense [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 27,584 58,814 75,478
Remuneration Of Net Sectorial Assets And Liabilities [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 11,208 3,744 62
Interest And Monetary Variation Of C R C Transfer [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses [1] 1,788
Other Financial Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses R$ 181,711 R$ 69,024 R$ 57,142
[1] The balance of the Account for Compensation of Income and Losses - CRC was settled by the Paraná State Government on August 10,2021, as detailed in Note 8 of the Financial Statements of December 31,2021.