The Basel Agency for Sustainable Energy (BASE) is a Swiss Foundation and Specialised Partner of United Nations Environment. BASE develops innovative ideas and tailored market-driven solutions to drive investment in sustainable energy and to meet the challenge of climate change.
A hybrid electric vehicle (HEV) is a type of hybrid vehicle and electric vehicle that combines a conventional internal combustion engine (ICE) propulsion system with an electric propulsion system (hybrid vehicle drivetrain). The presence of the electric powertrain is intended to achieve either better fuel economy than a conventional vehicle or better performance. There are a variety of HEV types, and the degree to which each functions as an electric vehicle (EV) varies as well. The most common form of HEV is the hybrid electric car, although hybrid electric trucks (pickups and tractors) and buses also exist.