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31. Revenue from sales (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue From Sales  
Revenue from sales
    2019   2018   2017
Sales of electricity          89,573,118          85,633,978          60,477,324
Right of use on poles              283,459              292,732               326,400
Connection charges                60,898                78,584                75,915
Reconnection charges                26,319                34,634                17,691
Total Revenue from sales          89,943,794          86,039,928          60,897,330