In Florida we use portable generators (lightning, hurricanes, etc.). Obviously, it wouldn't work in an upstairs office in a large building, but if you are on the ground floor, you can roll it outside, start it up, and run some essential lights, refrigerators, computers, even a small AC unit, with a 3,000 to 5,000 watt unit. Some of the Honda generators are super quiet. You need an electrician to install a "transfer switch" on your fuse box, so you can hook up the line from the generator to selective circuits of your inside wiring, rather than running extension cords.