[iamthemonster]

Absolutely superb. The 'hot bricks in a box' concept of very high temperature thermal energy storage has been really coming into its own with the fall of solar PV costs, and it's quite suitable for industrial consumers of medium temperature heat. There's also a heated granite storage silo in Scandinavia that's recently gone into operation. The rate of heat transfer in the heat storage material is a classic constraint.

I think this niche of 'very long duration, very constant slow rate of discharge' is clever, and it would suit industrial heat consumers but could also suit district heating for buildings in a climate that's predictably in need of heating all winter long (Canada for example).

They seem to have a decent grasp of the fundamentals, both of the technology and how to commercially carve a niche. I wish them well, and thank you for the post.