The companies that are licensing the tech. Unfortunately that'll be the big names so you're already pretty heavily priced out of a serious buy. There will be small startups around the world to working on smaller, less-sexy applications (medical implants come to mind since the power requirements for batteries would bottom out) that you very well could make a lot of money in, but there won't be an Edison here, the world is too diversified already and this is a new version of existing tech, not something new.

Who knows though, maybe we'll be able to finally launch ships into space without rockets?