How Mirrors Could Solve our Energy Problem

Fun fact: Using mirrors to concentrate light is not mutually exclusive with using photovoltaics. Concentration photovoltaics is also a thing, where you use PV cells that are optimized for far more light than conventional photovoltaics. For that matter, there are photovoltaic/thermal hybrid systems out there that use a thermal transfer fluid to cool the PV cells.
There are many many flavors of solar power :)