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Contract assets (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of fair value measurement of assets [line items]    
Contract assets R$ 7,210,906 R$ 7,605,061
Current 283,896 284,616
Noncurrent 6,927,010 7,320,445
Power Distribution Service Concession [Member]    
Disclosure of fair value measurement of assets [line items]    
Contract assets 1,701,448 2,201,958
Power Transmission Concession [Member]    
Disclosure of fair value measurement of assets [line items]    
Contract assets R$ 5,509,458 R$ 5,403,103