I've been following developments in solar energy since the seventies and I've never heard of this before. For those in the Northern climes this makes far more sense than roof mounted solar cells.

You may be wondering as I was how do they get the power to the ground? Here's an article than explains the technology:

https://en.wikipedia.org/wiki/Space-based_solar_power

What it doesn't say is what amount of power is lost getting transmitted back to earth. Anyone have an idea?