I haven't done the napkin math for this, but I don't think we'll need enough power from fusion to generate useful quantities of helium. I think we might get clo

I haven't done the napkin math for this, but I don't think we'll need enough power from fusion to generate useful quantities of helium. I think we might get closer with certain kinds of fission. (alpha radiation is helium, after it captures a few electrons. IIRC, where Earth's helium comes from)