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INVESTMENTS - Business Combination - Triangulo Mineiro Transmissora S.A. ("TMT") (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 21, 2023
Jan. 01, 2023
Dec. 31, 2023
Business combinations      
Proportion of ownership interest in joint venture     50.38%
Tringulo Mineiro Transmissora S.A. ("TMT")      
Business combinations      
Proportion of ownership interest in joint venture 49.00%    
Amount allocated to intangible asset related to concession agreements R$ 896    
Percentage of ownership interest held prior to acquisition 49.00%    
Cash transferred R$ 273,211    
Deferred tax liabilities 227    
Total adjustment in net assets 669    
Premium      
Fair value of liquid assets acquired by the Company 582,644    
Consideration transferred 273,211    
(c) Fair value of shareholding maintained before combination of businesses 285,495    
(d) = (b) + (c) 558,706    
(d) - (a) Premium 23,938    
Revenue since acquisition date   R$ 54,810  
Profit/Loss since acquisition date   R$ 44,234  
Tringulo Mineiro Transmissora S.A. ("TMT")      
Premium      
(c) Fair value of shareholding maintained before combination of businesses R$ 68,481    
Furnas | Tringulo Mineiro Transmissora S.A. ("TMT")      
Business combinations      
Control of acquired, percentage 51.00%    
Furnas | Tringulo Mineiro Transmissora S.A. ("TMT")      
Business combinations      
Percentage of equity interest /Percentage of participation 100.00%    
Furnas | Tringulo Mineiro Transmissora S.A. ("TMT")      
Business combinations      
Proportion of ownership interest in joint venture 49.00%