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INFORMATION BY BUSINESS SEGMENT (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Segment      
Net operating revenue R$ 37,158,908 R$ 34,074,233 R$ 34,626,834
Operating expenses (26,129,636) (29,275,307) (29,702,291)
Depreciation and amortization (3,621,342) (2,690,269) (1,443,285)
Other expenses (674,774) (1,593,394) (1,487,330)
Regulatory remeasurements - Transmission Contracts (12,144) 365,178  
Income before financial result 11,017,128 5,164,104 9,783,287
Financial Result (12,002,121) (4,373,595) (1,441,954)
Other income and expenses 651,280 186,924 1,210,754
Net income from continuing operations 4,726,875 2,651,597 5,798,863
Profit (loss) from discontinued operations (332,014) 986,785 (85,230)
NET PROFIT FOR THE YEAR 4,394,861 3,638,382 5,713,633
Operating Segments [Member]      
Operating Segment      
Net operating revenue 37,158,908 34,074,233 34,626,834
Third parties 37,158,908 34,074,233 34,626,834
Operating expenses (26,129,636) (29,275,307) (29,702,291)
Depreciation and amortization (3,621,342) (2,690,268) (1,443,285)
Other expenses (22,508,294) (26,585,039) (28,259,006)
Regulatory remeasurements - Transmission Contracts (12,144) 365,178 4,858,744
Income before financial result 11,017,128 5,164,104 9,783,287
Financial Result (12,002,121) (4,373,595) (1,441,954)
Income from equity interest 2,062,090 2,369,777 1,507,418
Other income and expenses 651,280 186,924 1,210,754
Current and deferred income tax and social contribution 2,998,498 (695,613) (5,260,642)
Net income from continuing operations 4,726,875 2,651,597 5,798,863
Profit (loss) from discontinued operations (332,014) 986,785 (85,230)
NET PROFIT FOR THE YEAR 4,394,861 3,638,382 5,713,633
Eliminations      
Operating Segment      
Net operating revenue (575,837) (559,147) (448,425)
Intersegments (575,837) (559,147) (448,425)
Operating expenses 575,837 559,147 448,425
Other expenses 575,837 559,147 448,425
Administration | Operating Segments [Member]      
Operating Segment      
Net operating revenue 110,270 379,988 1,366,364
Intersegments     18,989
Third parties 110,270 379,988 1,347,375
Operating expenses (920,109) (4,660,501) (14,437,255)
Depreciation and amortization (37,213) (11,197) (11,860)
Other expenses (882,896) (4,649,304) (14,425,395)
Income before financial result (809,839) (4,280,513) (13,070,891)
Generation | Operating Segments [Member]      
Operating Segment      
Net operating revenue 22,397,652 20,252,000 17,994,908
Intersegments 264,091 244,761 222,010
Third parties 22,133,561 20,007,239 17,772,898
Operating expenses (17,809,931) (14,730,658) (9,578,850)
Depreciation and amortization (3,476,566) (2,353,916) (1,337,709)
Other expenses (14,333,365) (12,376,742) (8,241,141)
Income before financial result 4,095,939 5,521,342 8,416,058
Transmission | Operating Segments [Member]      
Operating Segment      
Net operating revenue 15,226,823 14,001,392 15,713,987
Intersegments 311,746 314,386 207,426
Third parties 14,915,077 13,687,006 15,506,561
Operating expenses (7,975,433) (10,443,295) (6,134,611)
Depreciation and amortization (107,563) (325,155) (93,716)
Other expenses (7,867,870) (10,118,140) (6,040,895)
Regulatory remeasurements - Transmission Contracts (12,144) 365,178 4,858,744
Income before financial result R$ 7,239,246 R$ 3,923,275 R$ 14,438,120