This direction has more potential. There have been several comments on the tiny "E" within the plug. Perhaps it draws too much attention to one letter. Another thing that makes the entire concept appealing is the subliminal association of positive and negative energy implied by use of positive and negative spaces. I suggest taking it bit further. Why not actually plug the right half of the logo into the left? Also modify or come up with a font that looks like conduit or electrical cord.
It takes a great deal of humility to subject yourself to open criticism. Good work so far. Before getting married to any concept, do a bit of research to see how really unique it is (or isn't).