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27. Accounts Payable Related to Concessions (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession R$ 584,163 R$ 554,954 R$ 565,542
Accounts payable related to concession, current 67,858 62,624  
Accounts payable related to concession, noncurrent R$ 516,305 492,330  
Use of Public Property      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Public property name (1) HPP Mauá    
Company Copel GeT    
Grant Jun. 29, 2007    
Signature Jul. 03, 2007    
Closing 07.2042    
Discount rate 5.65% p.y.    
Annual adjustment IPCA    
Accounts payable related to concession R$ 16,709 16,384  
Use of Public Property      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Public property name (2) HPP Colider    
Company Copel GeT    
Grant Dec. 29, 2010    
Signature Jan. 17, 2011    
Closing 01.2046    
Discount rate 7.74% p.y.    
Annual adjustment IPCA    
Accounts payable related to concession R$ 23,864 23,188  
Use of Public Property      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Public property name (3) HPP Baixo Iguaçu    
Company Copel GeT    
Grant Jul. 19, 2012    
Signature Aug. 20, 2012    
Closing 01.2047    
Discount rate 7.74% p.y.    
Annual adjustment IPCA    
Accounts payable related to concession R$ 7,412 6,977  
Use of Public Property      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Public property name (4) SHP Cavernoso    
Company Copel GeT    
Grant Jul. 11, 2013    
Signature Jul. 11, 2013    
Closing 07.2018    
Discount rate 7.74% p.y.    
Annual adjustment IPCA    
Accounts payable related to concession R$ 0 27  
Use of Public Property      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Public property name (5) HPP Apucaraninha    
Company Copel GeT    
Grant Jul. 11, 2013    
Signature Jul. 11, 2013    
Closing 07.2018    
Discount rate 7.74% p.y.    
Annual adjustment IPCA    
Accounts payable related to concession R$ 0 185  
Use of Public Property      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Public property name (6) HPP Chaminé    
Company Copel GeT    
Grant Jul. 11, 2013    
Signature Jul. 11, 2013    
Closing 07.2018    
Discount rate 7.74% p.y.    
Annual adjustment IPCA    
Accounts payable related to concession R$ 0 320  
Use of Public Property      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Public property name (7) HPP Derivação Rio Jordão    
Company Copel GeT    
Grant Jul. 11, 2013    
Signature Feb. 24, 2014    
Closing 02.2019    
Discount rate 7.74% p.y.    
Annual adjustment IPCA    
Accounts payable related to concession R$ 47 313  
Use of Public Property      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Public property name (8) HPP Fundão e HPP Santa Clara    
Company Elejor    
Grant Oct. 23, 2001    
Signature Oct. 25, 2001    
Closing 10.2036    
Discount rate 11.00% p.y.    
Annual adjustment IGPM    
Accounts payable related to concession R$ 536,131 R$ 507,560