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INVESTMENTS - Assets and Liabilities of joint ventures and associates projects (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2020
Associates and joint ventures |  |  |  |
Current assets | R$ 64,451,102 | R$ 47,897,131 |  |
Non-current assets | 225,420,228 | 219,160,523 |  |
Total asset | 289,871,330 | 267,057,654 |  |
Current liabilities | 31,435,916 | 26,885,327 |  |
Non-current liabilities | 136,241,184 | 127,433,219 |  |
Net operating revenue | 19,609,159 | 11,017,128 | R$ 5,164,104 |
Net Profit/(Loss) | 10,380,754 | 4,394,861 | 3,638,382 |
Other components of comprehensive income | 1,929,651 | 159,311 | 715,241 |
Total comprehensive income | 12,310,405 | 4,554,172 | 4,353,623 |
Cash and cash equivalents | 26,572,522 | 13,046,371 | 10,739,126 | R$ 192,659
Depreciation and amortisation | (3,987,775) | (3,621,342) | (2,690,269) |
Income tax expense | R$ 240,030 | R$ (2,998,498) | R$ 695,613 |
Eletronuclear |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 67.95% | 67.95% |  |
Current assets | R$ 3,817,658 | R$ 3,179,932 |  |
Non-current assets | 20,768,853 | 19,937,388 |  |
Total asset | 24,586,511 | 23,117,320 |  |
Current liabilities | 3,008,197 | 2,612,091 |  |
Non-current liabilities | 9,939,459 | 9,889,551 |  |
Net worth | 11,638,855 | 10,615,678 |  |
Total liabilities | 24,586,511 | 23,117,320 |  |
Net operating revenue | 4,230,830 | 3,931,707 |  |
Net Profit/(Loss) | R$ 544,787 | R$ 318,199 |  |
ISA Energia |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 21.63% | 35.74% |  |
Current assets | R$ 6,942,987 | R$ 5,012,971 |  |
Non-current assets | 35,058,267 | 29,806,577 |  |
Total asset | 42,001,254 | 34,819,548 |  |
Current liabilities | 3,058,587 | 2,305,315 |  |
Non-current liabilities | 19,228,086 | 15,134,093 |  |
Net worth | 19,714,581 | 17,380,140 |  |
Total liabilities | 42,001,254 | 34,819,548 |  |
Net operating revenue | 6,417,562 | 5,133,704 |  |
Net Profit/(Loss) | R$ 3,498,416 | R$ 2,841,117 |  |
Norte Energia S.A - NESA |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 49.98% | 49.98% |  |
Current assets | R$ 2,322,930 | R$ 1,773,469 |  |
Non-current assets | 40,441,466 | 41,373,463 |  |
Total asset | 42,764,396 | 43,146,932 |  |
Current liabilities | 2,539,955 | 2,354,484 |  |
Non-current liabilities | 30,637,340 | 29,534,358 |  |
Net worth | 9,587,101 | 11,258,090 |  |
Total liabilities | 42,764,396 | 43,146,932 |  |
Net operating revenue | 6,249,120 | 5,764,413 |  |
Net Profit/(Loss) | R$ (1,675,978) | R$ (850,814) |  |
Belo Monte Transmissora de Energia SPE S.A |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 49.00% | 49.00% |  |
Current assets | R$ 1,278,940 | R$ 1,231,090 |  |
Non-current assets | 8,374,140 | 7,944,087 |  |
Total asset | 9,653,080 | 9,175,177 |  |
Current liabilities | 660,683 | 613,330 |  |
Non-current liabilities | 4,224,616 | 4,170,939 |  |
Net worth | 4,767,781 | 4,390,908 |  |
Total liabilities | 9,653,080 | 9,175,177 |  |
Net operating revenue | 1,159,427 | 1,039,054 |  |
Net Profit/(Loss) | R$ 500,304 | R$ 415,782 |  |
Interligao Eltrica do Madeira S.A. - IE Madeira [Member] |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 49.00% | 49.00% |  |
Current assets | R$ 1,228,448 | R$ 1,022,813 |  |
Non-current assets | 6,352,671 | 6,293,140 |  |
Total asset | 7,581,119 | 7,315,953 |  |
Current liabilities | 760,573 | 578,744 |  |
Non-current liabilities | 2,440,143 | 2,733,476 |  |
Net worth | 4,380,403 | 4,003,733 |  |
Total liabilities | 7,581,119 | 7,315,953 |  |
Net operating revenue | 747,614 | 712,294 |  |
Net Profit/(Loss) | R$ 478,090 | R$ 411,868 |  |
Jirau Energia S.A. |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 40.00% | 40.00% |  |
Current assets | R$ 1,890,657 | R$ 1,450,472 |  |
Non-current assets | 17,564,198 | 18,666,697 |  |
Total asset | 19,454,855 | 20,117,169 |  |
Current liabilities | 1,141,624 | 1,136,429 |  |
Non-current liabilities | 9,141,462 | 10,027,652 |  |
Net worth | 9,171,769 | 8,953,088 |  |
Total liabilities | 19,454,855 | 20,117,169 |  |
Net operating revenue | 3,582,148 | 3,378,906 |  |
Net Profit/(Loss) | R$ 218,681 | R$ 44,213 |  |

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