[BostonEnginerd]

There's substantial wafer capacity in the US, from silane production, through polysilicon granule production and wafer making. There are several different wafer makers in the US with both 200mm and 300mm wafer capacity.

Some of the silane and polysilicon companies are US owned, but I don't think that any of the wafer makers are US headquartered anymore.

[throwawaymaths]

Isn't all high grade silicon derived from one place in the US?

[kurthr]

Spruce Pine - https://en.wikipedia.org/wiki/Spruce_Pine_Mining_District

It's the purest source, but lots of cheap PV poly is made from other stuff.