If you have a fish store near you -- NOT a chain like PetCo, or PetsMart -- they may be willing to take in your fish. This assumes they have back up power, and that you can get to them.
Back 17 years ago or so, I had tanks and was living in a large apartment complex. Construction at another building hit a gas line; all the buildings were evacuated, power shut down, and we were not allowed back for 5 days. The company paid for all our expenses, many of us had pets and had to stay 5 nights at a pet friendly hotel nearby (I had 4 cats).
The chain pet stores have all their tanks in along line, so if my fish had been sick, it would spread to the entire store, so they were not willing to help, and I got that. There were 2 small fish supplier shops in my area, and both had individual tanks, which were not connected to more than 1 or 2 other tanks. One shop owner willing took in my fish, in a nice tank that was already set up -- he moved the fish to another tank, which was in a series of 3. He held my fish for free for 2 weeks!
Once power came back on, I had to completely clean my tank (white vinegar) and get things started. The owner GAVE me all the water I needed (his tank where my fish were was larger than my 2 together) AND back when I took the fish in, he had asked me what I had for filters. Unknown to me (I was super anxious, having to find the hotel, get a fireman to escort me in to my apartment to get clothes, my cats into carriers and out, then the fish OMGOSH it was nuts!), he did this so he could get filter media going in HIS tank where my fish were, for me!
With the transfer of the water and filter media, along with the fish, everything went smoothly and I did not lose ONE FISH. That man was so helpful to me and never took a penny!
There ARE good people in this world!
Hope you do not lose power, or if you do, it is just for a short hour or so.