The sunshine that hits the Earth in a single hour could meet the world's food and energy demands for an entire year. If only we could make use of it, that is. Solar power is not just about turning sunlight into electricity - we also need a way of capturing and storing it, of moving it around to where it's needed. Of providing power during the night. In short we need a way of bottling sunshine so we can have as much of it as we want, wherever and whenever we like.