Using the latest electric-vehicle technologies and new manufacturing techniques, Tesla sprang from Silicon Valley with an electric sports car. Fisker, another new Californian firm, is building a hybrid luxury car called the Karma. Other firms have projects under way ranging from electric commuter cars to conversions of existing vehicles. And yesterday a tiny company called Delta Motorsport unveiled not just one but five working prototypes of its 150mph (241kph) E-4 Coupe, developed and built with a minuscule £750,000 ($1.2m) budget.
