A prestressing unit which has a first ramp disk and a second ramp disk. The turbine then drives its motor in reverse to generate power to be supplied to the various components of the systems and to other appliances during emergency mode operation. Advantageously, the current invention may be implemented using currently available technology and integrated into a variety of different devices such as broad-band and narrow-band amplifiers, high-speed logic gates, mixers, oscillators, wireless local area networks, global positioning systems and modern communication systems.