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OPERATING EXPENSES (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Costs      
Personnel R$ (3,754,032) R$ (4,239,745) R$ (4,633,682)
Voluntary dismissal plan (226,815) (544,609) (1,260,370)
Material (220,042) (251,098) (269,083)
Services (2,237,706) (2,361,562) (2,065,232)
Energy purchased for resale (5,068,123) (3,028,226) (3,117,655)
Charges on use of the electricity grid (3,954,730) (3,482,126) (2,746,132)
Fuel for electricity production (1,991,855) (2,042,867) (2,085,996)
Construction cost (4,286,914) (3,291,132) (1,678,631)
Depreciation and amortization (3,987,775) (3,621,342) (2,690,269)
Donations and contributions 145,085 111,101 206,438
Operating provisions/Reversals (34.1) (180,019) 2,481,054 6,928,425
Others (1,009,106) (674,774) (1,593,394)
Expenditure      
Total expenditure R$ (26,702,164) R$ (26,129,636) R$ (29,275,307)