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35 Financial Instruments (Details 3) - Foreign Exchange Risk [Member] - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]    
Financial assets, Baseline R$ 98,433  
Financial assets, projected probable   R$ 13,903
Financial assets, projected scenario 1   14,181
Financial assets, projected scenario 2   42,265
Financial liabilities, Baseline R$ (410,588)  
Financial liabilities, projected probable   57,992
Financial liabilities, projected scenario 1   175,137
Financial liabilities, projected scenario 2   292,282
Loans and Financing [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets and liabilities risk USD appreciation  
Financial liabilities, Baseline R$ (108,983)  
Financial liabilities, projected probable   (4,578)
Financial liabilities, projected scenario 1   (32,968)
Financial liabilities, projected scenario 2   (61,358)
Suppliers - Eletrobras (Itaipu) [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets and liabilities risk USD appreciation  
Financial liabilities, Baseline R$ (222,431)  
Financial liabilities, projected probable   31,416
Financial liabilities, projected scenario 1   94,878
Financial liabilities, projected scenario 2   158,340
Suppliers - Acquisition Of Gas [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets and liabilities risk USD appreciation  
Financial liabilities, Baseline R$ (79,174)  
Financial liabilities, projected probable   11,183
Financial liabilities, projected scenario 1   33,772
Financial liabilities, projected scenario 2   56,361
Collaterals And Escrow Accounts - Stn [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets and liabilities risk USD depreciation  
Financial assets, Baseline R$ 98,433  
Financial assets, projected probable   13,903
Financial assets, projected scenario 1   14,181
Financial assets, projected scenario 2   R$ 42,265