[ted_dunning]

Because with a heliostat you have to move the energy as heat and that isn't as efficient and definitely not as easy or cheap as moving it as electricity.

Do the numbers. Making the top of the heliostat isn't what matters. What matters is making the inside of a pile of dirt that hot.

[Straw]

They are pitching co-located PV, and they already have a system to move the heat inside the pile of dirt!