/Hybrid Hydrogen Bus

H2+2 is a hybrid bus driven by electric power obtained through a battery supplied by the grid and supplemented with energy produced aboard, by means of hydrogen fuel cells.   It is a silent and zero-emission vehicle, with energy efficiency greater than that of diesel buses. With 100% Brazilian technology, the vehicle was launched during the Rio+20, UN’s conference about sustainable development, in 2012, in the city of Rio de Janeiro.
The second version of the bus, the H2+2 is 40% more efficient in energy harnessing and has a manufacturing cost 30% cheaper than the former model, the H2, which was launched in 2010. Changes to the traction control system made it possible to reduce the power of the fuel cell and make it lighter without affecting the performance of the vehicle.   
Kinetic Energy
Coppe’s hydrogen bus has a fuel efficiency of more than 300 kilometers, which is the distance equivalent to the daily average displacement of urban diesel buses. As the Formula 1 cars, it recovers kinetic energy, which is produced with movements, but which is lost during deceleration and braking. In the H2+2 bus, the kinetic energy is transformed in electricity and it is reused.
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H2+2: Hybrid Hydrogen Bus (2012)