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Subsequent events (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Assets acquired R$ 49,703,700 R$ 49,537,535  
Cash and cash equivalents 2,678,457 3,472,845 R$ 3,222,768
Recoverable taxes 355,065 151,912  
Other receivables 2,278,293 2,266,805  
Property, plant and equipment 10,069,468 10,142,591  
Intangible assets 10,277,727 9,215,560  
Suppliers 125,448 125,249  
Total of net assets acquired 801,116 R$ 397,933 R$ 403,183
Goodwill 204,057    
Consideration amount 1,005,173    
Fair Value [Member]      
IfrsStatementLineItems [Line Items]      
Assets acquired 301,102    
Cash and cash equivalents    
Trade accounts receivable    
Other receivables    
Property, plant and equipment    
Liabilities assumed 102,375    
Suppliers    
Loans and financing    
Other accounts payable    
Net assets acquired 198,727    
Santa Rosa And Mundo Novo Wind Complex [Member] | Book Value [Member]      
IfrsStatementLineItems [Line Items]      
Assets acquired 840,938    
Cash and cash equivalents 67,440    
Trade accounts receivable 23,961    
Recoverable taxes 5,747    
Other receivables 9,157    
Property, plant and equipment 734,633    
Intangible assets    
Liabilities assumed 625,811    
Suppliers 56,611    
Loans and financing 557,810    
Tax obligations 7,579    
Other accounts payable 3,811    
Contingent Liabilities    
Deferred income tax and social contribution     
Net assets acquired 215,127    
Santa Rosa And Mundo Novo Wind Complex [Member] | Fair Value Adjustment [Member]      
IfrsStatementLineItems [Line Items]      
Assets acquired 366,360    
Cash and cash equivalents    
Trade accounts receivable    
Recoverable taxes    
Other receivables    
Property, plant and equipment    
Intangible assets 366,360    
Liabilities assumed 131,100    
Suppliers    
Loans and financing    
Tax obligations    
Other accounts payable    
Contingent Liabilities 10,155    
Deferred income tax and social contribution  120,945    
Net assets acquired 235,260    
Santa Rosa And Mundo Novo Wind Complex [Member] | Fair Value [Member]      
IfrsStatementLineItems [Line Items]      
Assets acquired 1,207,298    
Cash and cash equivalents 67,440    
Trade accounts receivable 23,961    
Recoverable taxes 5,747    
Other receivables 9,157    
Property, plant and equipment 734,633    
Intangible assets 366,360    
Liabilities assumed 756,911    
Suppliers 56,611    
Loans and financing 557,810    
Tax obligations 7,579    
Other accounts payable 3,811    
Contingent Liabilities 10,155    
Deferred income tax and social contribution  120,945    
Net assets acquired R$ 450,387