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Schedule of generation concession agreements (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning R$ 6,929,456  
Intangible assets, ending 9,215,560 R$ 6,929,456
Generation Concession Agreement In Service [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 195,622 209,467
ANEEL grant - use of public property 63,446  
Amortization of quotas - concession and authorization   (17,527)
Capitalizations for intangible in service 1,823 3,682
Amortization of quotas - concession and authorization (72,148)  
Hydrological Risk Renegotiation 1,570,543  
Intangible assets, ending 1,759,286 195,622
Generation Concession Agreement Concession Authoriztion Rights [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 358,218 373,204
Amortization of quotas - concession and authorization   (14,986)
Effect of acquisition of control of Vilas Complex 277,120  
Goodwill arising from the business combination 94,221  
Amortization of quotas - concession and authorization   (14,987)
Intangible assets, ending 714,572 358,218
Generation Concession Agreement [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 553,840 582,671
ANEEL grant - use of public property 65,269 3,682
Amortization of quotas - concession and authorization   (32,513)
Effect of acquisition of control of Vilas Complex 277,120  
Goodwill arising from the business combination 94,221  
Amortization of quotas - concession and authorization (87,135)  
Hydrological Risk Renegotiation 1,570,543  
Intangible assets, ending   553,840
Generation Concession Agreement In Progress [Member]    
IfrsStatementLineItems [Line Items]    
ANEEL grant - use of public property 1,823 3,682
Capitalizations for intangible in service R$ (1,823) R$ (3,682)