One that take several order of magnitude more energy to create that it can store? I am in!

The same could easily be said of the battery in your phone, your car, and your laptop. The difference is that energy can be replenished easily, it's storage that's always been the hitch.

yeah by 'possible' I mean 'it would be a stretch, but it's not impossible'. You don't know that there might be a really efficient nucleosynthesis of these guys that we haven't found yet. Plus, there are places where energy is really abundant but hard to capture and store, like, really close to the sun.