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Financial Results (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Financial income R$ 1,069,116 R$ 956,413 R$ 901,605
Financial expenses 2,274,106 1,950,927 1,247,970
(-) Update of provision for destination of (1,204,990) (994,514) (346,365)
PIS and Cofins credits 1,011,370
Financial result, net (1,204,990) (2,005,884) (346,365)
Return On Financial Investments [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 540,672 406,270 146,408
Arrears Charges On Energy Bills [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 200,341 265,818 320,469
Interest On Taxes To Be Offset [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 89,938 63,810 36,649
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 69,059 2,720 5,373
Financial expenses 140,214 142,673 200,629
Remuneration Of Net Sectorial Assets And Liabilities Expense [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 62,795 146,753 35,902
Income And Monetary Restatement Of Judicial Deposits [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 55,092 42,846 21,167
Exchange Rate Variation Over The Itaipu Power Purchase [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 17,073 43,946 30,043
Financial expenses 10,605 27,584 58,814
Other Financial Income [Member]      
IfrsStatementLineItems [Line Items]      
Financial income 75,660 25,748 81,790
Pispasep And Cofins Taxes On Financial Income [Member]      
IfrsStatementLineItems [Line Items]      
(-) Pis/Pasep and Cofins taxes on financial income (41,514) (41,498) (41,216)
Monetary And Exchange Variation And Debt Charges [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 1,763,555 1,479,057 855,814
Monetary Restatement On The Provision For Legal [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 77,715 8,621
Restatement Of Provision For Allocation Of Pis And Cofins Credits [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 58,518 29,324
P I S Pasep Cofins Taxes On Interest On Capital [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 101,251 107,720 34,382
Interest On Tax Installments [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 39,569 38,111 13,618
Interest On R And D And EEP [member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 26,009 33,810 15,115
Interest On Lease Liabilities [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 24,292 19,441 13,176
Remuneration Of Net Sectorial Assets And Liabilities [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses 4,542 11,208 3,744
Other Financial Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Financial expenses R$ 27,836 R$ 61,999 R$ 21,869