Based on the analysis of the data of the housing stock in Kazan, the following diagram of distribution by the number of floors for apartment buildings commissioned since 2010 in the city of Kazan was obtained, as shown in Fig. Significant differences were distinguished, which resulted in the identification of three groups of residential buildings : the 1st group -residential buildings without elevators and with gas stoves, this category included 1-5 floors' apartment buildings the 2nd group -residential buildings with elevators and gas stoves, this group included 6-10 floors' apartment buildings the 3rd group -residential buildings with elevators and electric stoves, this group includes apartment buildings with the number of floors above 11 as it is impossible to install gas stoves in buildings above 10 floors without the implementation of additional measures requiring approval in accordance with the procedure established by law. The study group included several thousand houses with evidence of the representativeness of the sample. To solve this situation, it is proposed to monitor electric loads with subsequent updating of standard documents in terms of calculated specific electric loads, which will bring the calculated values closer to the actual ones to increase economic efficiency in the construction and operation of the power grid complex. Low load of power transformers leads to an increase in losses in them by comparing those working with a load of 70% an inefficient use of investments. The capacity of power transformers is selected according to account 70% of the total maximum load in the rated mode. The Association “Roselektromontazh” conducted research of TS loading of 0.4/10 kV in several cities of the Russian Federation, the results of which determined that about 80% of TS work with a maximum load of less than 30% during the year. The constructed cable networks and transformer substations of 0.4 / 10 kV are actually underloaded. The practice of operating power supply systems has shown that in most cases the actual load is 1.5 – 2.5 times less than the calculated load. Design organizations use standard specific load values to calculate the power consumed by residential and public buildings.
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