LOL, I was waiting for DM's explanation about how atom bombs also work.

The energy is there boobaa, there's actually a LOT of energy stored at the atomic level. Its difference from chemical energy, tho, which is what DM described. Conservation of energy is a basic physics law in this universe (so far, anyway). It would be a HUGE deal if it wasn't, lol.

I think the issue w/electric motors (vs. fuel cells) is one of heat production. There's a LOT of wasted energy/heat with EMs.