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OPERATIONAL CONTEXT - New concession contracts - Impacts on the result (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operational Context [Line Items]    
Net book value R$ 4,949,475  
Net Tax Indemnity 4,594,413  
Result (355,062) R$ 355,062
Eletronorte    
Operational Context [Line Items]    
Net book value 2,991,263  
Net Tax Indemnity 4,594,413  
Result 1,603,150  
Eletronorte | UHE Curu-Una    
Operational Context [Line Items]    
Net book value 630  
Net Tax Indemnity 17,741  
Result 17,111  
Eletronorte | Tucuru    
Operational Context [Line Items]    
Net book value 2,990,633  
Net Tax Indemnity 4,576,672  
Result 1,586,039  
Chesf    
Operational Context [Line Items]    
Net book value 619,230  
Result (619,230)  
Chesf | Boa Esperana    
Operational Context [Line Items]    
Net book value 98,219  
Result (98,219)  
Chesf | UHE Apolnio Sales (Moxot)    
Operational Context [Line Items]    
Net book value 38,250  
Result (38,250)  
Chesf | Paulo Afonso I    
Operational Context [Line Items]    
Net book value 92,612  
Result (92,612)  
Chesf | Paulo Afonso II    
Operational Context [Line Items]    
Net book value 107,093  
Result (107,093)  
Chesf | Paulo Afonso III    
Operational Context [Line Items]    
Net book value 66,259  
Result (66,259)  
Chesf | Paulo Afonso IV    
Operational Context [Line Items]    
Net book value 20,832  
Result (20,832)  
Chesf | UHE Luiz Gonzaga (Itaparica)    
Operational Context [Line Items]    
Net book value 15,150  
Result (15,150)  
Chesf | Xingo    
Operational Context [Line Items]    
Net book value 28,174  
Result (28,174)  
Chesf | Funil - BA    
Operational Context [Line Items]    
Net book value 12,626  
Result (12,626)  
Chesf | Pedra    
Operational Context [Line Items]    
Net book value 8,067  
Result (8,067)  
Chesf | Sobradinho    
Operational Context [Line Items]    
Net book value 131,948  
Result (131,948)  
Furnas    
Operational Context [Line Items]    
Net book value 1,338,982  
Result (1,338,982)  
Furnas | Corumb I HPP    
Operational Context [Line Items]    
Net book value (4,497)  
Result 4,497  
Furnas | Estreito    
Operational Context [Line Items]    
Net book value 479,561  
Result (479,561)  
Furnas | Funil - RJ    
Operational Context [Line Items]    
Net book value 8,110  
Result (8,110)  
Furnas | Furnas    
Operational Context [Line Items]    
Net book value 566,098  
Result (566,098)  
Furnas | Marimbondo    
Operational Context [Line Items]    
Net book value 15,844  
Result (15,844)  
Furnas | UHE Porto Colmbia    
Operational Context [Line Items]    
Net book value 1,912  
Result (1,912)  
Furnas | Itumbiara    
Operational Context [Line Items]    
Net book value 62,492  
Result (62,492)  
Furnas | Mascarenhas de Moraes HPP    
Operational Context [Line Items]    
Net book value 209,462  
Result R$ (209,462)