A deeper wind and solar power complementarity could drive much wider renewable energy deployment than developing power projects which concentrate on either renewable energy source in isolation. That was one of the key findings of the Exploiting wind-solar resource complementarity to reduce energy storage need study by the Lappeenranta University of Technology, in Finland. The report – written by professor of solar economy Christian Breyer and his team and published in Aims Energy – stated the wider renewables adoption which could result from an increased complementarity of the two sources might reduce the current need for big advances in energy storage technology that would be required to integrate clean energy into grids. Solar and wind generation exhibit significant seasonal variability and resource quality from place to place, the researchers stated. For example, wind production peaks in spring in California and Saudi Arabia, and in winter in Finland. “Due to its tendency to show some periodic trend in terms of its daily generation, wind output is very spiky, showing several dips after reaching peak daily output,” stated the paper.