Oh look, someone invented Cold Fusion (again)

It's not that easy, solar energy doesn't work at night or on cloudy days and electrical power has to be generated at the same time it's consumed (same logic goes to eolic).
Not to mention you can't fill the your car's tank with sunlight.

Taking advantage does not necessarily mean using only solar power for every industry/every means of creating electricity. I am assuming he means to put it on buildings and areas where it can generate electricity when the sun is out and when it isn't, use either fossil fuels or oil to get electricity from a power company. You can use the solar panels to generate electricity for yourself/your business or whatever you need it for and then sell back the excess electricity to the power company.