The event showcased environmentally friendly transport and energy solutions. BMW claims to have been the first major car maker to introduce a working fleet of hydrogen-powered cars having used the alternative fuel in a fleet of previous generation 7 Series models in the late 1990s. The brand said it would launch its first commercially available hydrogen-powered 7 Series within the lifespan of the current version of its flagship model. Meanwhile BMW has this month introduced a new entry-level model to the Z4 line-up. The four-cylinder 16-valve engine derivative is the same unit featured in the BMW 1 Series and the latest 320i saloon. Prices start at £22,755 on the road and a higher specification SE version comes in at £23,465.