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OPERATING EXPENSES (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
BRL (R$)
employee
Dec. 31, 2022
BRL (R$)
Dec. 31, 2021
BRL (R$)
Expenditure      
Personnel R$ (4,239,745) R$ (4,633,682) R$ (4,340,109)
Voluntary dismissal plan 2022 140 (1,260,370)  
Voluntary dismissal plan 2023 (544,749)    
Material (251,098) (269,083) (247,858)
Services (2,361,562) (2,065,232) (1,541,840)
Energy purchased for resale (3,028,226) (3,117,655) (4,259,957)
Charges on use of the electricity grid (3,482,126) (2,746,132) (2,276,254)
Fuel for electricity production (2,042,867) (2,085,996) (1,889,722)
Construction (3,291,132) (1,678,631) (1,395,066)
Depreciation and amortization (3,621,342) (2,690,269) (1,443,285)
Donations and contributions (111,101) (206,438) (164,696)
Operating provisions/Reversals (36.1) (2,481,054) (6,928,425) (14,922,063)
cost recovery - adherence to hydrological risk     4,265,889
Others (674,774) (1,593,394) (1,487,330)
Total expenditure (26,129,636) R$ (29,275,307) R$ (29,702,291)
Expenses related to Voluntary Redundancy Plan - 2023 R$ 544,749    
Number of quantity of employees 1,573