Hybrid power systems use both renewable energy and fossil-fueled electricity generation techniques. A hybrid power system combines a renewable energy system - typically based on photovoltaics or wind generation - with battery energy storage, an inverter, and an engine-driven generator set fueled by diesel, gasoline, or another fuel.

Hybrid power research is an expanding area of research within the CASE section of the Mechanical Engineering Department of Imperial College of Science, Technology and Medicine. Based on the expertise of high-speed electrical machine design, the group focus is now on specialised electric machines for hybrid power application and system simulation and optimisation.