We had a major blizzard where I live a couple of weeks ago, and the newscast said we would likely be without power. So I planned ahead, fed my fish in advance, lit a heater in my room (to get some residual heat in there), and checked to make sure all of my wiring would be okay. Our power only ended up being out for 12 hours (and at night), and the next morning, as anxious as I was, my fish were perfectly fine. All of my setups were in working order, and so far, nothing ill has come from it.