Sounds like too much. 4 of us with central heating throughout, and a washer and dryer that go every 2nd day at least..this month$391(and that is high for us in insulated house). Try contact, you can do smooth pay and get online discount and discount for payments ontime. Smooth pay spreads cost over yr and we are almost always in credit. Is the house well insulated? We are in Waikato so similar climate