I lost power once in February a few years back when I first started my tank. The power was out for almost 24 hours. I never even gave a thought to circulation (duh). I was most worried about the temp. I wrapped the tank in newspaper and then bubble wrap because this was all I could think of at the spur of the moment. I then took all the warmest comforters and drapped them over the tank. Sure enough, the tank stayed fairly warm! Every now and then, I would stick a wooden spoon in there and stir things a little. Incredibly, I didn't lose a single thing! Power came back on and just like that things came back to life in there! I know I was super lucky. The tank only had a few fish, inverts and a couple of hardy corals in addition to gobs of liverock and livesand.
Now I have a generator....
Ohioballer...bummer about your loss. Where in Ohio are you? I know there were some fierce storms lurking about the state yesterday. Did one of these hit your area? Is a back up generator a possibility for you? Ohio doesn't get weather like Oklahoma or Texas or Kansas but we do seem to get enough bad weather to make the addition of a generator a real security item!
at least you got $75 to replace stuff with 
