Terra: well he's working on a device that can harvest energy from stars by destroying them. He says it'll only be used on stars that have one or two small exoplanets but even then it'd decimate any life in that solar system. And that's not even mentioning what it could do to larger ones.
He'd honestly be better off manufacturing dyson spheres since they aren't harmful to the solar system they inhabit, and are a more long term energy source.