Also it depends where your from in the states. If your from DC or NYC metro areas your already use to the high prices here. Also if you are from the Southwest where you either have to run your AC or die then its easy to save a lot of electricity here. Just in case you dont know Shud, electricity per Kwh here is like four times as much as in the states. So I would strongly advise that not only turn things off but you actually unplug them. Also speaking of electricity you need surge protectors on all your electronics that you dont want to have to rebuy. The fluctuations can be so bad here that they can actually destroy your surge protector but better to destroy your surge protector that destroy your $3K TV.
But Candidly tho, you and your family need to do a Pre-move Visit (PMV). I never had to raise kids on the island, but I have had grandkids on the island for extended visit, really small town atmosphere, and great neighbors, but know zilch about the schools.
I do however, wonder if a move here for a 12 month job is really worth it. I think you have to legitimately love the islands to live here.