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MIT's Pathway to Fusion Energy - Zach Hartwig

tl;dr: it's a matter of funding

ARC, the design that would require 40% of the world's annual production of beryllium to make a single 500 MW(th) reactor.

> Total world reserves of beryllium ore are greater than 400,000 tonnes.[27]

https://en.wikipedia.org/wiki/Beryllium

Seems like there's just not enough demand yet.

Total world estimated Be resource would make ARC reactors capable of supplying just 1% of current world primary energy demand (using the USGS estimate of 100,000 tonnes.)

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