As discussed in further comments in this thread , when a fusion power setup has generators whose output connects back into the input/output ports of a reactor, plasma can get lost and overall power production gets reduced. Deleting and rebuilding a generator can fix the issue, so the order of ...

I ran into the same problem, but I think it's caused when you connect the output of a generator back into a reactor. Something in the plasma fluid calculations doesn't like this, and it results in some plasma getting lost. Once I redid my setup to make sure that reactors' plasma ports only touched ...