The search for an automotive power source to replace the Otto and Diesel engines used today has yielded few concrete results to date. One alternative which has long been considered is the gas turbine, another is electric drive. Now, the combination of these two in a hybrid system presents new opportunities and drives of this type are currently under trial in vehicles such as the Volvo Environmental Concept Car. The development of high-speed generators and efficient electric motors has played a decisive role in the success of this new concept. The Volvo hybrid drive and its characteristics are described along with another unique key component: the combustion system. Minimum emission levels have been a high priority and a unique low-emission design has been developed. The combustion chamber employs the lean-premixed-prevaporized technique, which means that the fuel is vaporized and mixed intimately with air prior to combustion, lowering the flame temperature and minimizing the NOx formation. The gas turbine emission levels are so low that it will be possible to build a high speed generation drive with lower emission levels than the ULEV limits applicable in the USA.