In work offered common and theoretically substantiated approach service areas determine and placing of the perspective substations. The modeling of service areas of substations is executed to decide a task and the geometrical templates are offered to arrange substations on city building territory. Dimensions of templates are obtained depending on the technical parameters. The geometrical templates can utilize to place rationally the perspective substations in city territory and to adjust the places of the existing substations in a reconstruction case. In a result development of urban power supply system takes a place not chaotic, but purposeful.