One woman on here hatched an egg that she carried in her bra for 21 days.
There are a bunch of good ideas on here. I've never used an incubator, so I'm not a good source, but have been amused at how inventive people can get, without going to the expense of a generator. If it's indoors and you climate is moderate, and the outage is short enough, a couple of blankets on the incubator may do the trick. For an hour or two outage, you may not need to do anything but leave it closed. ("Cedar Springs" doesn't tell much; a state or country would be better.)