What if this fusion power thing actually pans out? The ITER is on track, and the scale model test in China earlier this year looked very promising. If we had access to (what from our perspective seems like) infinite clean energy what could we do with it? Transmute elements? Desalinize seawater? Drive a rotating magnetic field the size of the planet for wireless global electric power? What are the limits?
When they say net positive, they are referring specifically to the plasma reaction (Q) and not the ability to extract energy. Total electrical output will be near 0. The tech is sadly still 20 year away.