The paper considers situations of the impact of various natural disasters on the electricity generating system as part of the energy system of a city or region. The impact of natural disasters in large part change the electricity consumption patterns, which makes it necessary not only to restore the power supply system, but also to conduct a complete review of its operation (reengineering). The paper discusses information technologies that provide a procedure for the reengineering of the electric power system when it is restored after an aggressive external influence, for example, a natural disaster.