You can go completely off grid & Go Solar,that would eliminate that worry!You could install a Parallel panel,it works mainly for Spikes(Up surges) but would have no effect for a down surge. Both would be Very costly at present,& each have their own Bugs to work with.You could buy a Gas fired Refridgerator that requires no voltage,it does have to be vented though,check out a store named Lehmans,they have supplied the Amish & Rural folks for a long time,Good Luck!