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19. Trade payables (Tables)
 12 Months Ended
Dec. 31, 2018
Trade Payables Tables Abstract  
Trade payables
       12.31.18     12.31.17 
Non-current          
Customer guarantees                       140,968                     148,349
Customer contributions                       112,324                     118,095
Funding contributions - substations                         32,925                       89,262
Total Non-current                       286,217                     355,706
           
Current          
Payables for purchase of electricity - CAMMESA                     4,080,310                  4,499,302
Provision for unbilled electricity purchases - CAMMESA                    7,828,458                  6,715,431
Suppliers                    2,426,016                  1,995,697
Advance to customer                        196,485                     220,111
Customer contributions                         15,288                       27,706
Discounts to customers                         37,372                       55,182
Funding contributions - substations                         17,215                       12,380
Related parties   35.d                          7,833                       51,711
Total Current                  14,608,977                13,577,520