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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

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