It may be possible but it's very difficult: we can't afford to loose many of the neutrons or we won't be able to create enough tritium. Engineered geothermal i

It may be possible but it's very difficult: we can't afford to loose many of the neutrons or we won't be able to create enough tritium. Engineered geothermal is at an extremely early stage, so I wouldn't count it out based on a few early failures.