Their "generator" in this case appears to be the reactor which generates helium-3 fuel by fusing deuterium fuel. Their eventual endgame is a first stage D->3He (dont know the exact process) fusion generator followed by the second stage D+3He->He+p (or 3He+3He->He+p+p) fusion reactor. They claim that even the precursor process of fusing Deuterium into He3 is net-electricity-positive overall, which is a claim that kind of works on a napkin as long as there is a physicist nearby engaging in some wild hand waving. It will be quite amazing if true.