I’m going off my college physics and astronomy classes here. And I’m old. So things may have changed, and I may have forgotten things. But if I remember correctly, quantum foam, or the basic level of quanta is roiling with “wormholes” that appear and disappear like bubbles in a soda. My professor said it would be cheaper (from an energy consumption perspective) to catch one and manipulate it than it would be to create one fresh. Even then, the targeting, tracking, then trapping 1 end (Nevermind both ends), holding on to it, expanding the orifice to a useable size and then stabilizing it. Well, it isn’t just a matter of available energy. You would also need energy to produce the needed exotic particles and anti matter on an ongoing basis needed to feed and control this one end of the wormhole. I think we, as a class, calculated a guesstimation that you would need millions’s of Dyson spheres (around a red dwarf, meaning 100% of a star’s output) worth of energy just to produce exotic particles (that we haven’t discovered yet) to use to manipulate and stabilize the entry. Nevermind feeding it enough exotic particles and antimatter to make it large enough to use, or build a tunnel of safe passage for travelers. And you would still have the other end whipping around the quanta trying to evaporate. But it can’t because your dumping all this energy into it. so it’s constantly shedding all the energy, exotic particles, and antimatter that you are pouring into it, out the other end. This would require more energy at an ever increasing pace. There would be no way to recover all that energy as we understand physics today. I also remember that the interior of a wormhole would be lethal to human life as well? Again, I’m old and so is my information. A good book about this, even though it may be a bit dated now, is “Blackholes and Timewarps” by Kip Thorne. It was a great read.