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39 Additional information to the Statement of Cash Flows (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Contract Assets R$ 1,406,454 R$ 1,039,234 R$ 813,450
Property, plant and equipment acquisitions 273,823 551,162 1,455,318
Right-of-use assets 132,521    
Foz do Chopim Energetica Ltda [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Accounts payable to suppliers     19,461
Purchases made in installments and not settled [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Contract Assets 104,834 48,068 50,927
Property, plant and equipment acquisitions R$ 21,773 R$ 52,446 R$ 71,454