do you have a gas bill too? if not, and you have a decent sized house, i would say thats not too horrible...my house is a 3 level split, 1388 sq/ft, about 460 sq/ft on each floor, and our gas in winter is maybe 130-140 and electric is about 80-100.
also, go to wally world and pick up some of those window sealing kits, and make sure you go to the office supplies section and get a few rolls of scotch double sided tape, because the stuff that comes with it is utter junk. go around the perimiter of the window frame, cut film to size, stick on, hit it with a blow dryer until all wrinkles are gone...helps A TON, and you could do a house with maybe 3 boxes at like $10/each