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35 Financial Instruments (Details 3) - Foreign exchange risk [member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Disclosure of detailed information about financial instruments [line items]  
Financial assets, Baseline R$ 133,521
Financial assets, projected probable (1,200)
Financial assets, projected scenario 1 (34,280)
Financial assets, projected scenario 2 (67,360)
Financial liabilities, Baseline (467,551)
Financial liabilities, projected probable 4,202
Financial liabilities, projected scenario 1 (111,636)
Financial liabilities, projected scenario 2 R$ (227,473)
Loans and Financing [member]  
Disclosure of detailed information about financial instruments [line items]  
Financial assets and liabilities risk USD appreciation
Financial liabilities, Baseline R$ (140,337)
Financial liabilities, projected probable 1,261
Financial liabilities, projected scenario 1 (33,508)
Financial liabilities, projected scenario 2 R$ (68,277)
Suppliers - eletrobras (Itaipu) [member]  
Disclosure of detailed information about financial instruments [line items]  
Financial assets and liabilities risk USD appreciation
Financial liabilities, Baseline R$ (288,640)
Financial liabilities, projected probable 2,594
Financial liabilities, projected scenario 1 (68,918)
Financial liabilities, projected scenario 2 R$ (140,429)
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$ (38,574)
Financial liabilities, projected probable 347
Financial liabilities, projected scenario 1 (9,210)
Financial liabilities, projected scenario 2 R$ (18,767)
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$ 133,521
Financial assets, projected probable (1,200)
Financial assets, projected scenario 1 (34,280)
Financial assets, projected scenario 2 (67,360)
Financial liabilities, Baseline R$ (467,551)