Pumping units of the country use more than 300 billion kWh of electricity annually, i.e. more than 20% of the whole amount of electricity generated by the electric power network of the country (Leznov, Saving energy in pumping installations, 1991). In accordance with the requirements of the energy efficiency law, consumers should save energy in their companies. Water supply companies face a problem of low efficiency of the main technological equipment, such as pumping units supplying water into the network, and sewage pumping stations.