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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Segment      
Financial effect of Itaipu     R$ 294,934
Other operating income R$ 136,540 R$ 651,280 186,924
Reportable Segments      
Operating Segment      
Power supply for distribution companies 18,811,949 17,030,455 14,104,623
Power supply for end consumers 2,941,312 3,853,830 3,925,510
CCEE 3,278,465 1,680,285 1,159,158
O&M revenue 10,789,254 11,387,237 11,055,951
Construction revenue 4,161,735 2,960,792 1,501,631
Financial effect of Itaipu     287,610
Contract revenue 7,405,486 7,136,080 7,901,256
Other operating income 337,166 426,427 1,101,817
Deductions Operating revenues (7,543,815) (7,316,198) (6,963,323)
Total net operating income 40,181,552 37,158,908 34,074,233
Administration      
Operating Segment      
CCEE     17,708
Financial effect of Itaipu     287,610
Other operating income 30,292 115,371 222,037
Deductions Operating revenues (341) (5,101) (147,367)
Total net operating income 29,951 110,270 379,988
Generation      
Operating Segment      
Power supply for distribution companies 18,811,949 17,030,455 14,104,623
Power supply for end consumers 2,941,312 3,853,830 3,925,510
CCEE 3,278,465 1,680,285 1,141,450
O&M revenue 3,063,896 4,052,072 4,676,630
Construction revenue     7,324
Other operating income 65,724 (104,270) 173,774
Deductions Operating revenues (4,484,379) (4,378,811) (4,022,072)
Total net operating income 23,676,967 22,133,561 20,007,239
Transmission      
Operating Segment      
O&M revenue 7,725,358 7,335,165 6,379,321
Construction revenue 4,161,735 2,960,792 1,494,307
Contract revenue 7,405,486 7,136,080 7,901,256
Other operating income 241,150 415,326 706,006
Deductions Operating revenues (3,059,095) (2,932,286) (2,793,884)
Total net operating income R$ 16,474,634 R$ 14,915,077 R$ 13,687,006