Based on this study, we were able to quantify -in a more reliable, accurate manner and at a lower cost than with the
traditional survey method- self consumption levels in the EDC substations. This also allowed for a more accurate calculation
of electrical losses in the power system. Random sampling techniques were successful in determining a subgroup of substations which, because of their characteristics, could be used to infer the Total Energy Consumption resulting from the use of substation equipment, also known as S/S Self Consumption.