At a glance they appear to be trying to do solar-thermal chemistry to generate fossil-fuel free cement directly[1], rather than solar power generation via e.g.

At a glance they appear to be trying to do solar-thermal chemistry to generate fossil-fuel free cement directly[1], rather than solar power generation via e.g. molten salt. I'm not familiar enough with the space to weigh in on utility/difficulty of their approach. [1] Probably normally natural gas fired burners/kilns