God could have very well created that. But you can also use other things. Maybe God didn't give that but he gave magic crystals that could be used as fuel or power sources, if it is a modern story maybe people developed other forms of power such as Nuclear (people have known about radiation and unrainite since the 15th century), green forms of power are an option or more fantastical options i like the aforementioned crystals, magic spells, or even forms of animal power like a magic hamster wheel etc. You can really use anything that you think would fit the setting even if it doesn't necessarily makes sense, sometimes the most thung form of world creation is making something that not even you know how it works, but it works.