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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