A system of guaranteed power supply constructed on a new principle by using the automated diesel engine – electric station, a source of uninterrupted power and monitoring system of electric power quality is submitted. Singularity of such electrical power system consist in availability of the monitoring system of quality of the electrical energy, intended for continuous monitoring and registering its parameters in real time on an input and output of a source of uninterrupted power. The application of such system will allow to supply reliable electrical power supply of customers of space rocket complexes.