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Financial Instruments (Details 3) - Currency risk [Member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
BRL (R$)
Disclosure of financial liabilities [line items]  
Financial liabilities, Baseline R$ (162,198)
Financial liabilities, projected probable 5,037
Financial liabilities, projected scenario 1 (34,253)
Financial liabilities, projected scenario 2 R$ (73,543)
Itaipu [Member]  
Disclosure of financial liabilities [line items]  
Financial assets and liabilities risk USD appreciation
Financial liabilities, Baseline R$ (162,198)
Financial liabilities, projected probable 5,037
Financial liabilities, projected scenario 1 (34,253)
Financial liabilities, projected scenario 2 R$ (73,543)