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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Associates and joint ventures |  |  |  |
Current assets | R$ 47,897,131 | R$ 49,623,127 |  |
Non-current assets | 219,160,523 | 220,594,335 |  |
Total asset | 267,057,654 | 270,217,462 |  |
Current liabilities | 26,885,327 | 26,270,428 |  |
Non-current liabilities | 127,433,219 | 132,747,950 |  |
Net operating revenue | 11,017,128 | 5,164,104 | R$ 9,783,287 |
Net Profit/(Loss) | 4,394,861 | 3,638,382 | 5,713,633 |
Other components of comprehensive income | 159,311 | 715,241 | 660,786 |
Total comprehensive income | 4,554,172 | 4,353,623 | 6,374,419 |
Cash and cash equivalents | 13,046,371 | 10,739,126 | 192,659 | R$ 286,607
Depreciation and amortisation | (3,621,342) | (2,690,269) | (1,443,285) |
Income tax expense | R$ (2,998,498) | R$ 695,613 | R$ 5,260,642 |
Companhia de Transmisso de Energia Eltrica Paulista - CTEEP |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 35.74% | 35.74% |  |
Current assets | R$ 5,978,428 | R$ 4,670,170 |  |
Non-current assets | 29,932,728 | 27,573,380 |  |
Total asset | 35,911,156 | 32,243,550 |  |
Current liabilities | 2,444,736 | 1,293,346 |  |
Non-current liabilities | 15,674,708 | 14,413,723 |  |
Net assets | 17,380,140 | 16,536,481 |  |
Total liabilities | 35,499,584 | 32,243,550 |  |
Net operating revenue | 6,215,521 | 5,450,570 |  |
Net Profit/(Loss) | 2,892,362 | 2,319,791 |  |
Other components of comprehensive income | (186,196) | 216,001 |  |
Total comprehensive income | 2,706,166 | 2,535,792 |  |
Cash and cash equivalents | 245,819 | 336,523 |  |
Current financial liabilities | 2,094,880 | 1,052,827 |  |
Non-current financial liabilities | 15,126,192 | 14,096,618 |  |
Depreciation and amortisation | (24,889) | (27,498) |  |
Interest income | 222,090 | 169,221 |  |
Interest expense | (1,043,648) | (981,399) |  |
Income tax expense | R$ (228,637) | R$ (358,343) |  |
Eletronuclear |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 67.95% | 67.95% |  |
Current assets | R$ 3,179,932 | R$ 4,610,349 |  |
Non-current assets | 19,937,388 | 18,373,593 |  |
Total asset | 23,117,320 | 22,983,942 |  |
Current liabilities | 2,612,091 | 2,434,613 |  |
Non-current liabilities | 9,889,551 | 9,970,923 |  |
Net assets | 10,615,678 | 10,578,406 |  |
Total liabilities | 23,117,320 | 22,983,942 |  |
Net operating revenue | 3,931,707 | 3,963,282 |  |
Net Profit/(Loss) | 318,199 | 29,822 |  |
Other components of comprehensive income | (1,772) | 698,427 |  |
Total comprehensive income | 316,427 | 728,249 |  |
Cash and cash equivalents | 29,374 | 32,471 |  |
Current financial liabilities | 544,969 | 594,758 |  |
Non-current financial liabilities | 6,352,760 | 6,718,183 |  |
Depreciation and amortisation | (420,733) | (594,597) |  |
Interest income | 907,977 | 540,160 |  |
Interest expense | (1,374,023) | (1,532,700) |  |
Income tax expense | R$ (269,463) | R$ (253,229) |  |
Norte Energia S.A - NESA |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 49.98% | 49.98% |  |
Current assets | R$ 1,773,469 | R$ 1,760,261 |  |
Non-current assets | 41,373,463 | 41,668,551 |  |
Total asset | 43,146,932 | 43,428,812 |  |
Current liabilities | 2,354,484 | 2,254,754 |  |
Non-current liabilities | 29,534,358 | 29,070,142 |  |
Net assets | 11,258,090 | 12,103,916 |  |
Total liabilities | 43,146,932 | 43,428,812 |  |
Net operating revenue | 5,764,413 | 5,565,305 |  |
Net Profit/(Loss) | (850,814) | (647,346) |  |
Total comprehensive income | (850,814) | (647,346) |  |
Cash and cash equivalents | 704,312 | 741,217 |  |
Current financial liabilities | 978,409 | 933,855 |  |
Non-current financial liabilities | 28,236,723 | 28,701,002 |  |
Depreciation and amortisation | (1,708,076) | (7,979) |  |
Interest income | 275,685 | 235,784 |  |
Interest expense | (2,570,068) | (2,522,958) |  |
Income tax expense | R$ 151,829 | R$ 115,441 |  |
Energia Sustentavel do Brasil S.A. - ESBR |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 40.00% | 40.00% |  |
Current assets | R$ 1,450,472 | R$ 1,210,513 |  |
Non-current assets | 18,666,697 | 19,354,405 |  |
Total asset | 20,117,169 | 20,564,918 |  |
Current liabilities | 1,136,429 | 1,058,167 |  |
Non-current liabilities | 10,027,652 | 10,597,876 |  |
Net assets | 8,953,088 | 8,908,875 |  |
Total liabilities | 20,117,169 | 20,564,918 |  |
Net operating revenue | 3,378,906 | 3,116,478 |  |
Net Profit/(Loss) | 44,213 | (104,235) |  |
Total comprehensive income | R$ 44,213 | R$ (104,235) |  |
Belo Monte Transmissora de Energia SPE S.A |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 49.00% | 49.00% |  |
Current assets | R$ 1,231,090 | R$ 1,140,735 |  |
Non-current assets | 7,944,087 | 7,679,713 |  |
Total asset | 9,175,177 | 8,820,448 |  |
Current liabilities | 613,330 | 630,800 |  |
Non-current liabilities | 4,170,939 | 4,096,162 |  |
Net assets | 4,390,908 | 4,093,486 |  |
Total liabilities | 9,175,177 | 8,820,448 |  |
Net operating revenue | 1,039,054 | 954,985 |  |
Net Profit/(Loss) | 415,782 | 360,022 |  |
Total comprehensive income | R$ 415,782 | R$ 360,022 |  |
Interligao Eltrica do Madeira S.A. - IE Madeira [Member] |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 49.00% | 49.00% |  |
Current assets | R$ 1,022,813 | R$ 931,271 |  |
Non-current assets | 6,293,140 | 6,251,143 |  |
Total asset | 7,315,953 | 7,182,414 |  |
Current liabilities | 578,744 | 634,666 |  |
Non-current liabilities | 2,733,476 | 2,817,425 |  |
Net assets | 4,003,733 | 3,730,323 |  |
Total liabilities | 7,315,953 | 7,182,414 |  |
Net operating revenue | 712,294 | 735,154 |  |
Net Profit/(Loss) | 411,868 | 471,557 |  |
Total comprehensive income | R$ 411,868 | 471,557 |  |
Empresa de Energia Sao Manoel S.A |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 33.33% |  |  |
Current assets | R$ 320,697 |  |  |
Non-current assets | 3,419,572 |  |  |
Total asset | 3,740,269 |  |  |
Current liabilities | 151,647 |  |  |
Non-current liabilities | 1,850,081 |  |  |
Net assets | 1,738,541 |  |  |
Total liabilities | 3,740,269 |  |  |
Net operating revenue | 446,946 |  |  |
Net Profit/(Loss) | (28,801) |  |  |
Total comprehensive income | R$ (28,801) |  |  |
Mata de Santa Genebra Transmissora S.A. |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 49.90% |  |  |
Current assets | R$ 689,261 |  |  |
Non-current assets | 3,078,913 |  |  |
Total asset | 3,768,174 |  |  |
Current liabilities | 115,975 |  |  |
Non-current liabilities | 2,181,769 |  |  |
Net assets | 1,470,430 |  |  |
Total liabilities | 3,768,174 |  |  |
Net operating revenue | 393,463 |  |  |
Net Profit/(Loss) | 116,292 |  |  |
Total comprehensive income | R$ 116,292 |  |  |
Chapecoense Gerao S.A. |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 40.00% |  |  |
Current assets | R$ 410,737 |  |  |
Non-current assets | 2,573,564 |  |  |
Total asset | 2,984,301 |  |  |
Current liabilities | 607,435 |  |  |
Non-current liabilities | 1,838,423 |  |  |
Net assets | 538,443 |  |  |
Total liabilities | 2,984,301 |  |  |
Net operating revenue | 1,274,912 |  |  |
Net Profit/(Loss) | 487,050 |  |  |
Total comprehensive income | R$ 487,050 |  |  |
Companhia Energtica Sinop |  |  |  |
Associates and joint ventures |  |  |  |
Percentage of Shareholdings | 49.00% |  |  |
Current assets | R$ 210,141 |  |  |
Non-current assets | 2,706,715 |  |  |
Total asset | 2,916,856 |  |  |
Current liabilities | 143,063 |  |  |
Non-current liabilities | 1,469,551 |  |  |
Net assets | 1,304,242 |  |  |
Total liabilities | 2,916,856 |  |  |
Net operating revenue | 341,162 |  |  |
Net Profit/(Loss) | (55,189) |  |  |
Total comprehensive income | (55,189) |  |  |
Jirau Energia S.A. |  |  |  |
Associates and joint ventures |  |  |  |
Cash and cash equivalents | 863,473 | 692,538 |  |
Current financial liabilities | 785,517 | 728,213 |  |
Non-current financial liabilities | 9,464,700 | 10,005,345 |  |
Depreciation and amortisation | (760,823) | (761,506) |  |
Interest income | 150,273 | 115,409 |  |
Interest expense | (1,008,553) | (981,914) |  |
Income tax expense | R$ (26,923) | R$ 51,122 |  |

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