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9 Revenue from sales and energy purchases (Tables)
 12 Months Ended
Dec. 31, 2020
Revenue From Sales And Energy Purchases  
Schedule of sales of electricity
    12.31.20   12.31.19   12.31.18
    GWh   $   GWh   $   GWh   $
Sales of electricity                        
Small demand segment: Residential use and public lighting (T1)    11,600     57,356    10,768     72,579    11,482     78,952
Medium demand segment: Commercial and industrial (T2)   1,341     10,544   1,549     15,975   1,668     12,658
Large demand segment (T3)   3,210     19,830   3,503     31,947   3,646     23,579
Other: (Shantytowns/Wheeling system)
   4,028    3,112   4,154    1,431   4,376    1,379
Subtotal - Sales of electricity    20,179     90,842    19,974   121,932    21,172   116,568
                         
Other services                        
Right of use of poles       421       386       398
Connection and reconnection charges       53       119       154
Subtotal - Other services       474       505       552
                         
                         
Total - Revenue         91,316       122,437       117,120

 

    12.31.20   12.31.19   12.31.18
    GWh   $   GWh   $   GWh   $
                         
Energy purchases (1)   25,124     (57,930)   24,960     (77,649)   25,906     (66,721)

 

(1) As of December 31, 2020, 2019 and 2018, includes technical and non-technical energy losses for 4,945 GWh, 4,986 GWh and 4,734 GWh, respectively.