On this side of the pond, the marquee alternative-energy sports car is the electric-powered Tesla Roadster. In the U.K., it's the Morgan Lifecar, which uses hydrogen fuel cells, though apparently they don't generate nearly the power of your average street-legal internal combustion engine. So Morgan Motor has also incorporated a bank of ultracapacitors to help with acceleration and hill climbing, and it's keeping things light(weight) with an aluminum chassis, wooden seats, and a lack of certain modern amenities ranging from a stereo to airbags.
Yes, for now it's just a concept car (backed by everyone from the British government to defense contractor Qinetiq to Oxford University)--but it looks good, anyway. Morgan plans to show off the car at the Geneva auto show later this week.
For more, see this story, and the pictures, at BBC News: "Green sports car set for launch"