Can thermal solar energy be stored until wintertime? Within a European research consortium Empa scientists and their colleagues have spent four years studying this question by pitting three different techniques against each other.
Power from wind farms prevented the creation of almost 36 million tonnes of greenhouse gas emissions from sources such as coal and gas in Britain, in a six-year period - the equivalent of taking 2.3 million cars off the road, analysis of nationwide output shows.
Researchers are scaling up a prototype iron-flow battery to provide cleaner and cheaper power when renewable energy sources are ebbing or demand is peaking. The battery would also efficiently store excess electricity when use is low.