At the end of Enel's Great Space Operations, he seems to be satisfied with how things goes on the moon.
Looking around, Enel sees endless followers, and an enormous amount of "vearth", and decides that the "Fairy Vearth" was everything that he had wanted.
But what happen after that? Did he goes back to earth?
Enel becomes the ruler of the moon according the wikia http://onepiece.wikia.com/wiki/Enel
Originally, Enel met a few more recent ones who came from the planet below to avenge their fallen creator on Machine Island. First Lieutenant Spacey was the first automaton that Enel encountered on the moon. He survived his encounter with the Space Pirates who came there to dig up the ancient city located on the moon. After meeting Enel, he considered him his savior. After finding his true roots, Enel established a new empire on the moon with the automata as his followers.
He stays on the moon.
