Kevin, power outages are always a real issue, however generators are not needed. Many back-up systems are avaliable for homeowner at relatively low-cost especially in comparison to a generator. Back-up systems utilize a seperate pump powered by a battery similar to that of a car battery and can be purchased at most hardware stores including your big-box chains.
Randy, yes that's all well and good, but usually the power goes out when the storm comes in. And if you don't have a generator then the sump pump is useless. So many people don't consider that aspect.