A HYBRID bus combines conventional internal combustion engine propulsion system with an electric propulsion system. The internal combustion engines are the ones that use petrol or diesel to power the vehicle. The electric propulsion system powers electric cars like Reva, and are becoming increasingly popular due to its non-polluting nature.

Pic: Gaadi.com

Diesel-electric hybrid The propulsion uses diesel and electric motors together to power the vehicle. This ensures lesser consumption of diesel.

Diesel/electric hybrid: This propulsion uses either diesel or electric at any given time of driving. It helps keeping the other as back-up. Many such buses have been introduced by manufacturers in the US, UK, New Zealand and Japan, some claiming a cut in carbon dioxide emissions up to 31% and fuel savings of 40%.

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