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30. Revenue from sales
 12 Months Ended
Dec. 31, 2018
Revenue From Sales  
Revenue from sales
     12.31.18     12.31.17     12.31.16 
Sales of electricity                 55,689,651                39,329,729                   25,576,978
Right of use on poles                     190,370                     212,265                        213,449
Connection charges                       51,105                       49,369                          30,893
Reconnection charges                       22,523                       11,505                            5,439
Total Revenue from sales                55,953,649                39,602,868                   25,826,759