I support the development of any promising variety of nuclear power, but all indications are that the ecat is as bogus as the thorium car and that Rossi is a just an ordinary scammer. He’s been doing these demonstrations for “independent” observers for years, and if he’d actually reached the levels of output claimed, he’d have had no problem getting into production long ago.
If you want the real deal in microscale nuclear, the most promising project at this time is Eric Lerner’s focus fusion reactor (Lawrenceville Plasma Physics). That’s still considered a low-odds long shot, and he hasn’t reached parity energy return yet, but at least his approach is thoroughly grounded in established physics. It all comes down to how precisely he can control plasma behavior.
If he does succeed, that would rapidly revolutionize global energy. The only catch would be that his reactor consumes boron, which is a relatively rare element, so it would only buy us a few centuries. We would still have to develop other energy sources eventually.