Some of it could be the efficiency of the hot water service and any heating or cooling that you have. in general older appliances use more power than newer ones, but Im guessing most of them are the same ones you would have had at the old house? If you have a different energy supplier at the new house that can come in to play as well.
We bought a new fridge when we moved here and have the old one on our verandah, so we were only running 1 fridge at the old place. At both places we have wood heating and an aircon. Except the aircon here is a split system which we only use in summer. All the other appliances are the same. I've gone from paying $70 a fortnight to $30 - I pay fortnightly by direct debit and this bill was $190 CREDIT!! So I called them and they refunded it to me in a cheque BONUS!

Funny thing is we have a unit attached to this house which has a tennant in it. THe bill is in my name, it just gets charged to her rent. The unit bill was $220. I was shocked that it was almost the same as our bill and our house is huge.

I won't complain though