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FINANCIAL RESULT (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financial Revenues      
Interest income, fines, commission and fees R$ 138,666 R$ 153,458 R$ 997,434
Revenue from financial investments 2,937,517 2,862,488 2,211,854
Additional of moratorium on electricity 119,500 165,978 252,637
Revenue on interest on dividends     10,950
Other financial income 223,898 479,159 566,848
(-) Taxation on financial revenue (267,782) (578,163) (611,964)
Total Financial revenues 3,151,799 3,082,920 3,427,759
Financial expenses      
Debt charges (6,117,463) (6,463,585) (4,705,030)
Charges from obligations with CDE (2,484,198) (2,292,321) (1,097,038)
River Basin Revitalization Charges (339,854) (355,430) (187,023)
Other financial expenses (1,198,578) (1,109,907) (804,999)
Total Financial expenses (10,140,093) (10,221,243) (6,794,090)
Financial results, net      
Monetary adjustments - CDE (1,604,680) (1,384,392) (197,580)
Monetary adjustments - hydrographic basins (288,081) (331,760) (23,017)
Monetary adjustments (778,157) (1,795,913) (877,025)
Exchange rate changes (28,821) 169,904 446,852
Variation of the derivative financial instrument not linked to debt protection (1,566,482) (908,381)  
Variation of net fair value of the protected debt (hedge) of the derivative (373,605) (613,256) (356,494)
Financial results, net (4,639,826) (4,863,798) (1,007,264)
Financial result R$ (11,628,120) R$ (12,002,121) R$ (4,373,595)