I have an 8,000W w/13,500W surge gasoline generator I set up in the garage and trenched into the back side of the panel, plenty of power to run the whole house. I looked into a propane unit, even had a crushed stone pad prepared to mount it on, but changed my mind. In the event of a big ice storm, or similar catastrophic event, it may be very difficult for the propane trucks to get in here (we live back in the woods) but I should always be able to get to town on my 4 wheeler for gasoline. Plus I didn't care for the amount of propane required for the exercise cycle.....seems like you could go thru a tank a year even if there were no outages.