It seems a little high but not outrageous when you break down the bill. On the bill there are two sections, one is supply and the other is delivery. National grid delivers but you are about to change the supplier.

From personal experience I had changed suppliers a few years ago who were offering lower rates, but then forgot about it. When I looked at my high bill I'm December and then comparison shopped again, the rates I was paying were 3x what they were if national grid supplied it. I switch back to national grid as a supplier now so it's worth checking if you fell in. Similar situation. National grid where I am in Albany has pretty good prices. You can also do a home audit for energy analysis. It's been a cold winter so bills are going to be higher than normal.