According to current estimates, the electricity consumption worldwide will have almost doubled by 2030, due to economic growth and population increase. At the same time, fossil fuels will not be available without limitation and there is a need for alternatives. June's edition of VIAVISION gives you an overview of renewable energy sources in Germany and shows you the challenges tomorrow's electricity supply will have to meet. Furthermore: Is the fuel cell any good as an alternative type of drive? How much electricity do electric cars actually need?