That last doesn't seem that obvious, nor does it seem entirely relevant, though. Do you mean doing a variety of things with that energy, or accomplishing them more efficiently?
Because the first one I can sorta concede, simply because most Star Trek Federation ships are not ships of war (Star Wars does, in fact, have stealth technology, albeit not 'make the ship literally invisible' cloaking (actually I think it might, I'm not so sure on that)). At least officially.
But it's not about sheer energy output, either. 40k wins a lot of things because it's just about as over-the-top as you can get, and they did it intentionally, and they did it in every possible theater. I'm usually arguing against the ludicrous numbers presented for it, but Star Wars still definitely loses to it. Star Trek is a much more peaceful universe, which is I think why most of the time people see it as weaker. I think it's mostly the engagement range and the strike craft that push it into Star Wars favor. Different methods of shielding and the like, too. Complaining about inconsistencies in stats between ships is another thing entirely.
Star Wars ships of equal size to a given Star Trek ship probably have lower energy use/needs. But it's hard to tell, and most Star Wars ships are much bigger, and are going to put out more energy. They're also purpose built for war, in the vast majority of cases.
EDIT: The economy thing is super obvious to me. Everything I've seen from the games and additional canon stuff says that Star Wars is basically over the entire galaxy. Federation isn't. And if you're comparing Star Trek as a whole, then Q and company makes discussion useless and shunts everything up to around 40k because Q may as well be a Chaos God. If you're just doing the stuff that isn't obscene and higher dimension being related, then it becomes about the Borg, not the Federation.