v3.26.1
INVESTMENTS - Measured at fair value (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Investments recognized at fair value    
Fair value R$ 1,175,539 R$ 861,234
Centrais Elétricas de Santa Catarina S.A - CELESC    
Investments recognized at fair value    
Percentage of participations for fair value investments 10.75%  
Fair value R$ 520,408 333,818
Energisa Holding    
Investments recognized at fair value    
Percentage of participations for fair value investments 0.11%  
Fair value R$ 244,410 171,873
Equatorial Energia Pará    
Investments recognized at fair value    
Percentage of participations for fair value investments 0.99%  
Fair value R$ 132,076 125,704
Companhia Energética do Ceará - COELCE    
Investments recognized at fair value    
Percentage of participations for fair value investments 6.33%  
Fair value R$ 157,394 120,320
Cia Estadual de Distribuição de Energia Elétrica - CEEE    
Investments recognized at fair value    
Percentage of participations for fair value investments 4.62%  
Fair value R$ 28,326 44,661
Companhia Energética de Brasília - CEB    
Investments recognized at fair value    
Percentage of participations for fair value investments 2.11%  
Fair value R$ 41,064 24,350
Rio Paranapanema Energia    
Investments recognized at fair value    
Percentage of participations for fair value investments 0.47%  
Fair value R$ 14,129 13,136
Taesa    
Investments recognized at fair value    
Percentage of participations for fair value investments 0.19%  
Fair value R$ 27,760 21,688
Auren Energia S.A.    
Investments recognized at fair value    
Percentage of participations for fair value investments 0.04%  
Fair value R$ 5,186 4,605
Others    
Investments recognized at fair value    
Fair value R$ 4,786 R$ 1,079
Others | Minimum    
Investments recognized at fair value    
Percentage of participations for fair value investments 0.01%  
Others | Maximum    
Investments recognized at fair value    
Percentage of participations for fair value investments 0.29%