For the townhouse I have a 650-watt gasoline generator - enough to run the fridge, freezers, a few lamps (with LED lights) the TV or a radio (to find out when the power is expected to come back) and the pellet stove (with the automatic igniter switched off so it's just a fan and a computer and gets lit manually).
Also: The self-contained travel trailer - which doubles as disaster-housing, has a propane fridge, furnace, stove, and water heater, along with white, grey, and black water tankage for a couple days with shower for me and the wife or a week without, and a couple kWhr of battery (that's kept charged and equalized off the line when it's available). If things are expected to go longer I have some solar panels in a box in the garage, the truck's feed-while-towing, or borrow-that-650-watt generator, that I could hook up to bring the batteries back up. TV is 120V but we have a 300W inverter that can run it while nearly idling. (AC and microwave oven are dead without line power - as they would be on a camping trip.)
For the ranch I have a several kW gasoline emergency generator - mostly so I can run the 240V well pump in a long outage. The propane "fireplace" stove has a milliwatt thermostat, so it gets enough power to run the flame valve from the pilot light. It's located in a corner of the "great room" so convection and infrared are enough to distribute the heat if the power, and thus the blower, are out. (This is a "don't freeze the house" backup for the propane main furnace - set to 50F and the main set to 55F when we're not present). Stove and water heater are propane, too, and we have several candle lanterns and lots of batteries for a big flashlight stashed in a known spot.
All this because I've been to over-employed to have the time to actually SET UP an R.E. system for either house, yet. B-b