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Contract assets (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Contract assets, beginning R$ 7,672,679    
Loss on disposal (16,728) R$ (8,829) R$ (7,155)
Contract assets, ending 7,605,061 7,672,679  
Power Distribution Service Concession [Member]      
IfrsStatementLineItems [Line Items]      
Contract assets, beginning 2,332,171 1,798,195  
Acquisitions 2,305,311 2,092,117  
Customers contributions (339,277) (243,916)  
Transfers to intangible assets (1,615,878) (1,137,324)  
Transfers to accounts receivable related to concession (451,250) (168,072)  
Loss on disposal (16,728) (8,829)  
Other transfers (12,391)    
Contract assets, ending 2,201,958 2,332,171 1,798,195
Power Distribution Service Concession [Member] | Assets Contract Assets [Member]      
IfrsStatementLineItems [Line Items]      
Contract assets, beginning 2,405,124 1,851,866  
Acquisitions 2,305,311 2,092,117  
Customers contributions  
Transfers to intangible assets (1,888,949) (1,332,118)  
Transfers to accounts receivable related to concession (507,401) (197,912)  
Loss on disposal (16,728) (8,829)  
Other transfers (12,391)    
Contract assets, ending 2,284,966 2,405,124 1,851,866
Power Distribution Service Concession [Member] | Special Liabilities [Member]      
IfrsStatementLineItems [Line Items]      
Contract liability, beginning (72,953) (53,671)  
Acquisitions  
Customers contributions (339,277) (243,916)  
Transfers to intangible assets 273,071 194,794  
Transfers to accounts receivable related to concession 56,151 29,840  
Loss on disposal  
Other transfers    
Contract liability, ending R$ (83,008) R$ (72,953) R$ (53,671)