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CONTRACTUAL TRANSMISSION ASSETS - Movements (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Investments in subsidiaries, joint ventures and associates [abstract]    
Balance at beginning of period R$ 61,052,210 R$ 59,514,968
Additions resulting from acquisitions 1,049,923  
Construction revenue 2,960,792 1,494,307
Financial income 7,136,080 7,901,256
Regulatory remeasurements - Transmission Contracts (12,144) 365,178
Transfers (21,778) 20,762
Amortization (10,952,745) (8,244,261)
Balance at end of period R$ 61,212,338 61,052,210
Discount rate for renewed contracts awarded (as a percent) 8.08%  
Average discount rate for renewed contracts (as a percent) 7.51%  
Current contract assets from right to the consideration originated by the non-depreciated infrastructure of RBSE R$ 31,803,983  
Furnas [Member]    
Investments in subsidiaries, joint ventures and associates [abstract]    
Balance at beginning of period 24,763,617 24,494,418
Additions resulting from acquisitions 1,049,923  
Construction revenue 1,249,585 480,112
Financial income 2,931,600 3,252,503
Regulatory remeasurements - Transmission Contracts   19,874
Amortization (4,822,141) (3,483,290)
Balance at end of period 25,172,584 24,763,617
Chesf    
Investments in subsidiaries, joint ventures and associates [abstract]    
Balance at beginning of period 18,860,799 18,128,156
Construction revenue 709,311 605,344
Financial income 2,201,144 2,403,532
Regulatory remeasurements - Transmission Contracts 184 228,155
Amortization (3,313,874) (2,504,388)
Balance at end of period 18,457,564 18,860,799
Eletronorte    
Investments in subsidiaries, joint ventures and associates [abstract]    
Balance at beginning of period 10,773,184 10,607,255
Construction revenue 642,678 143,735
Financial income 1,271,975 1,399,382
Regulatory remeasurements - Transmission Contracts (350) 21,890
Amortization (1,797,801) (1,399,078)
Balance at end of period 10,889,686 10,773,184
CGT Eletrosul    
Investments in subsidiaries, joint ventures and associates [abstract]    
Balance at beginning of period 6,654,610 6,285,139
Construction revenue 359,218 265,116
Financial income 731,361 845,839
Regulatory remeasurements - Transmission Contracts (11,978) 95,259
Transfers (21,778) 20,762
Amortization (1,018,929) (857,505)
Balance at end of period R$ 6,692,504 R$ 6,654,610