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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