[samstokes]

The glowing tower contains molten salt, used to store the focused solar energy. [1] I never knew that was a thing until I too drove past it. It was one of the more memorable sights on a 3000 mile road trip.

[1] https://en.m.wikipedia.org/wiki/Solar_thermal_energy#Molten_...

[pmikesell]

Ivanpah uses water, not salts:

https://en.m.wikipedia.org/wiki/Ivanpah_Solar_Power_Facility