The latest in eco-friendly car technology has been on display at the Low Carbon Vehicles 2009 event at the Millbrook Proving Ground test track in Bedfordshire.
Manufacturers of all sizes are working on greener vehicles - but how do they perform on the road?
The BBC's Jason Palmer tried out three of the latest electric cars: The Mitsubishi i-MiEV, the Mini E and the Tesla Roadster Sport Signature 250.
