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Intangible assets (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Generation Concession Agreement In Service [Member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning R$ 1,303,158 R$ 1,530,777
Effect of acquisition of control   0
Technical goodwill arising from the business combination   0
Grant Bonus 4,073,915  
ANEEL grant - use of public property 205,201 0
Amortization of quotas - concession and authorization (230,680) (228,513)
Capitalizations for intangible in service   894
Reclassification (30,674)  
Intangible assets, ending 5,320,920 1,303,158
Generation Concession Agreement In Progress [Member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 0 0
Effect of acquisition of control   0
Technical goodwill arising from the business combination   0
Grant Bonus 0  
ANEEL grant - use of public property 0 894
Amortization of quotas - concession and authorization 0 0
Capitalizations for intangible in service   (894)
Reclassification 0  
Intangible assets, ending 0 0
Generation Concession Agreement Concession Authoriztion Rights [Member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 1,498,544 721,838
Effect of acquisition of control   614,958
Technical goodwill arising from the business combination   204,443
Grant Bonus 0  
ANEEL grant - use of public property 0 0
Amortization of quotas - concession and authorization (44,383) (42,695)
Capitalizations for intangible in service   0
Reclassification 0  
Intangible assets, ending 1,454,161 1,498,544
Generation Concession Agreement [Member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets, beginning 2,801,702 2,252,615
Effect of acquisition of control   614,958
Technical goodwill arising from the business combination   204,443
Grant Bonus 4,073,915  
ANEEL grant - use of public property 205,201 894
Amortization of quotas - concession and authorization (275,063) (271,208)
Capitalizations for intangible in service   0
Reclassification (30,674)  
Intangible assets, ending R$ 6,775,081 R$ 2,801,702