If you are close to a LFS or wally world even, get a battery powered pump with an airstone (or two) until power comes back. Temp is another factor.
Also change the filter media, maybe run some carbon just to be safe as soon as you get power back.
We lost power for 6 hours about a month ago, all I did was change the filter media when the power came back on, and everything did fine. It was so warm out, the tank temp didn't even move a degree.
HTH,
Bobby