Hybrid vehicles contain two engines: (1) one electric motor, which uses the power to drive the vehicle and (2) one combustion engine (or a fuel cell), which supplies electric power to the electric motor or the batteries. In “parallel” systems the combustion engine also drives the vehicle.
Hybrids generally require smaller batteries than full-electric cars, because they also carry fuel. The energy content may be limited but the specific power (kW/kg) has to be high.
Hybrid vehicles only turn “renewable” if they use fuel (diesel, petrol, hydrogen) or power from renewable sources.
