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INFORMATION BY BUSINESS SEGMENT - Income from external customers per segment (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Segment      
Other operating income R$ 651,280 R$ 186,924 R$ 1,210,754
Reportable Segments [Member]      
Operating Segment      
Power supply for distribution companies 17,030,455 14,104,623 11,836,975
Power supply for end consumers 3,853,830 3,925,510 3,334,527
CCEE 1,680,285 1,159,158 3,090,100
O&M revenue 11,387,237 11,055,951 10,188,340
Construction revenue 2,960,792 1,501,631 1,618,045
Financial effect of Itaipu   287,610 65,831
Contract revenue 7,136,080 7,901,256 9,946,627
Other operating income 426,427 1,101,817 925,455
Deduction from operating income (7,316,198) (6,963,323) (6,379,066)
Total net operating income 37,158,908 34,074,233 34,626,834
Administration      
Operating Segment      
CCEE   17,708 1,426,062
Financial effect of Itaipu   287,610 65,831
Other operating income 115,371 222,037 146,312
Deduction from operating income (5,101) (147,367) (271,841)
Total net operating income 110,270 379,988 1,366,364
Generation      
Operating Segment      
Power supply for distribution companies 17,030,455 14,104,623 11,836,975
Power supply for end consumers 3,853,830 3,925,510 3,334,527
CCEE 1,680,285 1,141,450 1,664,038
O&M revenue 4,052,072 4,676,630 4,220,474
Construction revenue   7,324 82,205
Other operating income (104,270) 173,774 462,762
Deduction from operating income (4,378,811) (4,022,072) (3,847,074)
Total net operating income 22,133,561 20,007,239 17,753,907
Transmission      
Operating Segment      
O&M revenue 7,335,165 6,379,321 5,967,866
Construction revenue 2,960,792 1,494,307 1,535,840
Contract revenue 7,136,080 7,901,256 9,946,627
Other operating income 415,326 706,006 316,381
Deduction from operating income (2,932,286) (2,793,884) (2,260,151)
Total net operating income R$ 14,915,077 R$ 13,687,006 R$ 15,506,563