Hei has one of the best abilities around. Even though the power wasn't originally his, he utilizes it pretty well.
Hei can generate and discharge electricity through conductive objects. Not only can he short out electrical systems and barbecue people with ease, but he can alter particles on a quantum level. He is capable of special particle luminance, meaning he is able to change molecules similar to how humans are changed into contractors. He also destroyed a large portion of South America without breaking a sweat!
Rearranging molecules and destroying countries means some serious power in my book!