Scientist in the Star Wars universe

[noob]

I believe that in the star war expanded universe there was engines that made energy from nothing(due to how they do not want to have to manage fuels) which would mean that if there is ways to turn energy into matter(which might be possible in the star wars universe if physics is invariant by translation since it is supposed to happen in the real universe but very far away and a long time ago) then you could create unlimited amounts of matter with enough time.
However the star wars expanded universe had a lot of silly things(like how the dark emperor is able to create black holes)
Whenever the generators can run forever or not is impossible to guess in the Disney star wars.