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Intangible assets (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Intangible Assets R$ 11,170,089 R$ 10,277,727  
Distribution Of Electricity Concession Agreement [Member]      
IfrsStatementLineItems [Line Items]      
Intangible Assets 8,317,327 7,257,827  
Generation Concession Agreement [Member]      
IfrsStatementLineItems [Line Items]      
Intangible Assets 2,801,702 2,252,615 R$ 2,473,858
Gas distribution [member]      
IfrsStatementLineItems [Line Items]      
Intangible Assets 726,107 96,145
Other [member]      
IfrsStatementLineItems [Line Items]      
Intangible Assets R$ 51,060 R$ 41,178 R$ 49,373