One of the pictures in the article shows one of those giant mirror arrays. They have one in the Eastern CA desert near Vegas. They reflect all the energy in a big circle into a single point, which when you look at it is at like, a near-sun-level of brilliance, where it (presumably) boils lots of water to run turbines or whatever.

Perhaps they're going to use those instead of all the rare earth complexity that is photovoltaics.