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17 Property, Plant and Equipment (Details Narrative)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
MW
Dec. 31, 2018
BRL (R$)
MW
Nov. 28, 2014
R$ / shares
Oct. 31, 2014
R$ / shares
Disclosure of detailed information about property, plant and equipment [line items]        
Borrowings and debentures | R$ R$ 4,295 R$ 4,229    
Average interest rate 0.11% 0.11%    
Total investment | R$ R$ 2,523,179 R$ 2,368,234    
Cutia and Bento Miguel Wind Farms [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Pre-tax discount rate 7.24% 7.13%    
Power Plants Of Parana [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Pre-tax discount rate 5.45% 5.36%    
HPP Colider [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Pre-tax discount rate 5.45% 5.36%    
Cutia Complex [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Auction final price per megawatt hour | R$ / shares       R$ 144.00
Restated price due to variation of IPCA 180.6      
Revision of assured power of project | MW 71.4      
Installed capacity of hydroelectric plant | MW 86      
Bento Miguel Complex [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Auction final price per megawatt hour | R$ / shares     R$ 142.03  
Restated price due to variation of IPCA   179.84    
Revision of assured power of project | MW   54.8    
Installed capacity of hydroelectric plant | MW   132.3    
Copel [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Pre-tax discount rate 6.57%      
Impairment losses | R$ R$ 87,399      
Write-offs | R$ R$ 124,067