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20 Accounts payable to suppliers
 12 Months Ended
Dec. 31, 2019
Accounts Payable To Suppliers [Abstract]  
Accounts payable to suppliers

20  Accounts Payable to Suppliers

  12.31.2019 12.31.2018
Energy supplies   1,085,777   819,792
Materials and supplies 520,647   384,300
Natural gas for resale 79,174 95,478
Charges for use of grid system   187,595   169,629
  1,873,193 1,469,199
Current    1,685,280 1,419,243
Noncurrent    187,913 49,956