A NASA Satellite that could power the Earth?

NASA Institute for Advanced Concepts (NIAC) is working on the idea of a satellite that could power the earth. Dr. Mankins, the leader of the study claims that 'A single solar power satellite would deliver power to on the order of a third of humanity—not all at the same time, but any of that market could, in principle, be addressed,'. He also says that the satellite could be built and launched as early as 2025 depending on funding. Read more: http://www.dailymail.co.uk/sciencetech/article-2402141/Plugged-sun-Solar-panel-satellite-beam-THIRD-humanitys-power-Earth-2025-claims-Nasa-engineer.html#ixzz2dohvhMIV
Also see this article/video for a simpler explanationhttp://mashable.com/2013/08/29/nasa-satellite-solar-power/ What are your thoughts about such a project?