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Intangible assets (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning R$ 10,277,727  
Intangible assets, ending 11,170,089 R$ 10,277,727
Generation Concession Agreement In Service [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 1,530,777 1,759,286
Amortization of quotas - concession and authorization (228,513) (228,509)
Capitalizations for intangible in service 894  
Intangible assets, ending 1,303,158 1,530,777
Generation Concession Agreement In Progress [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning
ANEEL grant - use of public property 894  
Capitalizations for intangible in service (894)  
Intangible assets, ending
Generation Concession Agreement Concession Authoriztion Rights [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 721,838 714,572
Effect of acquisition of control 614,958 23,982
Technical goodwill arising from the business combination 204,443 8,154
Amortization of quotas - concession and authorization (42,695) (24,870)
Intangible assets, ending 1,498,544 721,838
Generation Concession Agreement [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 2,252,615 2,473,858
Effect of acquisition of control 614,958 23,982
Technical goodwill arising from the business combination 204,443 8,154
Amortization of quotas - concession and authorization (271,208) (253,379)
ANEEL grant - use of public property 894  
Intangible assets, ending R$ 2,801,702 R$ 2,252,615