For one, solar power may be easier to harness in outer space. But there's a problem: it's in outer space. There is no reason why we should be resorting to such measures when we have the potential to harness solar energy here on the earth's surface.
There are energy demands that must be met, and it is true that our needs will grow exponentially. However, more earthlings than ever (percentage-wise) have a sufficient source of energy, and I believe this number will continue to climb.
This is not to say that this company's efforts are a waste of time. Far from it. We need overambitious entrepreneurs to at least attempt these solutions so that we can better gauge the difficulty of the problem at hand. While this technology may not be realistically implementable, it very may well lead to a newer, more efficient way of harnessing solar energy. If this technology works, more power to them. And to us.