It's not the kind of tech which people are largely interested in when they say fusion energy. But fusors are already built and used commercially, consuming ener

It's not the kind of tech which people are largely interested in when they say fusion energy. But fusors are already built and used commercially, consuming energy to produce something else. Helium could just be another derived product, along with fast neutrons, radioactive isotopes, etc. You could "renew" all you needed, if you had no choice... it wouldn't be cheap, or as cheap, just like he says in the video about dwindling supplies. You don't really run out, it just gets really expensive.