It's very high, but what I experienced in Newport too, unfortunately. I was in Newport ~5 years ago in a small 1br, and those winter electricity bills were double what I'm currently getting charged in a good sized 2br over in downtown (Columbus towers). They definitely had much worse insulation in my Newport apt.

So to your question, they can be high in JC but not THAT high everywhere. Newport was higher than other high-rises in jc in my experience.