During power outages moving all reptiles into smaller temporary containers to a small well insulated room of the house, to keep them at a decent temperature (not necessary peak but warm enough to be above the minimum night time drop) will do, as long as they had not eaten within a few days before the power outage. If they had been fed, then provide extra eat to ensure a hot spot for them to be. Just make sure they don't risk overheating.
the long lasting shipping heat packs are always good to have on hand for such an emergency. Worse comes to worse, you can just put the snakes in bags and lay them on your stomach while lying down. Your own body heat is more than enough to keep the snakes warm. Good for a few hours, not so good if you fall asleep, don't want to roll ontop of your pets. Especially if you keep venomous snakes.
Watch for sales, as those black and decker gas generators do come on sale time to time. Depending on how big your collection is a small one may be all you need to keep heat pads running. It also doesn't hurt to contact friends or relatives who live other side of town or a nearby town which may be far enough away should the power outage be local (unlike say that major power outage about ten years ago or so which took out most of Eastern US and up into Canada.)
There was a guest chat last year or the year before about how to prepare for emergencies like power outages etc, which should be in the archives. It wasn't a reptile specific chat but for all pets. Useful transcript to listen/read.
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PHLdyPayne
Forum Princess