When you're dealing with solar (or any renewable really), you have to think about the generation of electricity and storage of that electricity.

Solar thermal plants can be used to generate energy, but they're not great at storing it for dispatch at later times. Even the link you provided has thermal storage as a component of the system-- you need to figure out how to dispatch electricity at night.

What's proposed is a cheaper storage solution, and they state it can still provide power after 10 hours.