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15. Receivable from Related Parties (Tables)
 12 Months Ended
Dec. 31, 2018
Receivable From Related Parties Tables Abstract  
Receivable from Related Parties
     
  12.31.2018 12.31.2017
Controlling shareholders    
State of Paraná (15.1)  -  130,417
     
Joint Ventures    
Voltalia São Miguel do Gostoso (15.2)  -  38,169
Structure sharing  -  405
   -  168,991
Current  -  38,835
Noncurrent  -  130,156