There are several things that you can do in the event of power loss.
1. You can do this every 3-5 minutes at a time. Fill up a bucket with tank water and pour it back into the tank slowly. It should generate bubbles as it pours back in. I usually do this about 3-4 times each time.
2. Buy a battery operated air pump and run them inside the tank during power loss, this should generate small water movement and aerating the water.
If there's no hope of having the power back on wihtin 4-5 hours, I'd pour all livestock into a rubbermaid container (granted you can catch them all..) and take them to someone's house with power. You can run a skimmer, lights and air pump and they should be fine.
This is also my biggest nightmare, it's one thing to be home when things like this happen, but I am so afraid that this will happen one day when i am not home or out of town(I travel quite a bit for races). I have lost my freshwater setup due to power loss before and it wasn't a happy feeling. More like devastation seeing something that have grown in front of you for years and lose it all within a day.
Things that I have in preparation for pwoer loss.
1. Sea Clone skimmer - pretty cheap to keep around, don;t work too well with huge bio load, but works fine for emergency.
2. Battery operated air pump
3. 20 gallon rubermaid container with lid- I drilled about 20 small holes.
4. UPC - Battery back up mentioned above. It's not much but it will buy you about 1-2 hours with small electrical load
It's not one thing you hope, but better to be prepare than not.
stan