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17 Property, Plant and Equipment (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Oct. 18, 2020
Aug. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]          
Borrowings and debentures     R$ 1,046 R$ 4,295 R$ 4,229
Average interest rate     0.04% 0.11% 0.11%
Total investment     R$ 2,729,517    
Jandaira Wind Complex [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Total investment     R$ 411,610    
New plants under construction led to sale of 14.4 MW mean in regulated contracts at the original price of R$ 98.00/MWh.   with installed capacity of 90.1 MW and physical guarantee of 47.6 MW mean    
Power Plants Of Parana [member] | Figueira Thermoelectric Plant [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Pre-tax discount rate     5.70% 5.45%  
Power Plants Of Parana [member] | Other plants [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Pre-tax discount rate     5.70% 5.45%  
Cash-generating units that have suffered no impairment [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Pre-tax discount rate     5.00% 10.00%  
UHE Colider [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Pre-tax discount rate     5.70% 5.45%  
Cutia Complex and Bento Miguel Complex [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Pre-tax discount rate     7.08% 7.24%  
UEG Araucaria [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Pre-tax discount rate     7.87% 7.76%  
SHPP Bela Vista [member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Total investment     R$ 220,000    
New plants under construction   led to sale of 14.7 MW mean in regulated contracts at the original price of R$ 195.70/MWh. installed capacity of 29.81 MW and physical guarantee of 18.4 MW mean