Power generators, is another element of the emergency power supply system that enables it to sustain longer work in the network equipment company. Unlike bezprzerwowych power supplies (UPS), which use electricity supplied by the electricity network, the role of the energy generator is - nomen omen - the production of electricity in a situation where there is an interruption in the supply of energy from an external supplier.

For energy production units use diesel or petrol engines. For this reason, the construction of facilities for electrical power is essential to ensuring adequate ventilation and exhaust system outside the building.

Due to the large costs related to the acquisition, maintenance and operation of aggregates, only large server rooms decide to purchase this type of equipment, however, and there are only aggregates complement the basic emergency power supply system consisting of power supplies bezprzerwowych. Typically, the system connects the unit and UPS, which provides the highest reliability in power supply devices that are inside the server room. The principle of its operation is very simple - as long as electricity is supplied from an external source, the unit is turned off, and the provision of security in the area of supply deals with UPS, where the shortage of energy from outside, through zasilaczowi bezprzerwowemu it is possible to maintain the entire system for a few minutes. When this break proves to be longer than initially expected, lower operating unit, which provides energy in spite of the lack of supply of energy from outside.