True from a historical perspective. The real question is, then, why is it STILL an energy bonus instead of trade?
I mean, I can justify in my head why psionic aliens might make good technicians. The jobs which populate generator districts presumably represent the guys who maintain and repair the generators, and one can see how some level of extra-sensory perception or precognition would help with that. Telekinesis could help with interacting safely and precisely with high-voltage and radioactive components.
But here we're getting into another issue: what sort of psions are your species? Do they all possess the full range of mental powers? I think it would be interesting if you started off with a baseline psionic trait that you could grow expand to include different bonuses by researching psionic "technology". Maybe telekinesis could be a buff to your worker jobs, ESP would represent your research boost, telepathy might include a trade bonus.