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Financial Results (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial results [Line Items]      
Financial income R$ 1,184,779 R$ 1,069,116 R$ 956,413
Finance costs 2,341,793 2,274,106 1,950,927
(-) Update of provision for destination of 0 0 1,011,370
Finance income (cost) (1,157,014) (1,204,990) (2,005,884)
Return On Financial Investments [Member]      
Disclosure of financial results [Line Items]      
Financial income 738,229 540,672 406,270
Arrears Charges On Energy Bills [Member]      
Disclosure of financial results [Line Items]      
Financial income 231,333 200,341 265,818
Interest On Taxes To Be Offset [Member]      
Disclosure of financial results [Line Items]      
Financial income 92,794 89,938 63,810
Other Financial Income [Member]      
Disclosure of financial results [Line Items]      
Financial income 74,252 75,660 25,748
Remuneration Of Net Sectorial Assets And Liabilities [Member]      
Disclosure of financial results [Line Items]      
Financial income 44,033 62,795 146,753
Income And Monetary Restatement Of Judicial Deposits [Member]      
Disclosure of financial results [Line Items]      
Financial income 32,859 55,092 42,846
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession [Member]      
Disclosure of financial results [Line Items]      
Financial income 17,838 69,059 2,720
Monetary variation over the Itaipu power purchase [Member]      
Disclosure of financial results [Line Items]      
Financial income 2,629 17,073 43,946
Pispasep And Cofins Taxes On Financial Income [Member]      
Disclosure of financial results [Line Items]      
Financial income (49,188) (41,514) (41,498)
Monetary And Exchange Variation And Debt Charges [Member]      
Disclosure of financial results [Line Items]      
Finance costs 1,745,166 1,763,555 1,479,057
Monetary variation and adjustment to present value of accounts payable related to the concession [Member]      
Disclosure of financial results [Line Items]      
Finance costs 167,296 140,214 142,673
Monetary Restatement On The Provision For Legal [Member]      
Disclosure of financial results [Line Items]      
Finance costs 96,964 77,715 0
P I S Pasep Cofins Taxes On Interest On Capital [Member]      
Disclosure of financial results [Line Items]      
Finance costs 86,609 101,251 107,720
Restatement Of Provision For Allocation Of Pis And Cofins Credits [Member]      
Disclosure of financial results [Line Items]      
Finance costs 43,327 58,518 29,324
Monetary variation over the Itaipu power purchase (expense) [Member]      
Disclosure of financial results [Line Items]      
Finance costs 40,616 10,605 27,584
Remuneration Of Net Sectorial Assets And Liabilities Expense [Member]      
Disclosure of financial results [Line Items]      
Finance costs 35,186 4,542 11,208
Interest On Lease Liabilities [Member]      
Disclosure of financial results [Line Items]      
Finance costs 28,560 24,292 19,441
Interest On Tax Installments [Member]      
Disclosure of financial results [Line Items]      
Finance costs 25,791 39,569 38,111
Interest On R And D And EEP [Member]      
Disclosure of financial results [Line Items]      
Finance costs 22,050 26,009 33,810
Other Financial Expenses [Member]      
Disclosure of financial results [Line Items]      
Finance costs R$ 50,228 R$ 27,836 R$ 61,999