I should say that the no heat approach is generally thought to be easier on them earlier on in the development stage. if you can get back up power to them, I'd have it ready. If you find that they are actually hatching during the storm and the lights go out and you are not having to attend to more important things, you could try keeping them close to your body. our body temp is pretty close to the right temp and at that point they will be generating more and more of their own heat. once hatched, keeping them in something akin to a shipping box, which holds heat in and gives adequate ventilation, could just be enough to get them through a couple of days without heat. they can go 2-3 days without heat or food if kept in an box, that's how they can get away with shipping them. bless you and your friends and family during this difficult time!