Nowadays, more and more devices are using solar energy: sunlight chargeable torch, phone whose batteries can be powered by light, and even some cars today use the electricity produced by the sun to work.

Anywhere in the world, we see the birth of power plant projects, based on the idea that solar power alone is able to provide electricity to the entire planet.

However the future of this energy resource depends on the control of other energy including electricity (that is to say, its transport and storage).