Whether you or a family member have a medical condition that you rely on medical equipment, you work from home, have a high profile job, security concerns, live in an area with frequent power outage you really should consider a back- up power generator. They are now affordable, easy to install, and automatically switch on when the power goes down.
The units run on natural gas or propane. They are hard wired into your electrical panel and detect a power outage and come on without you having to do anything or even be home. The average cost range is from $5,000 to $12,000. Depending on the size of unit you select and how much of your home and electronics you want to keep running when the power goes out.
For example at my house I selected a smaller unit. That was enough to power my heating, air conditioning, one water heater, refrigerator, microwave, computer, one TV, and three rooms of lights (kitchen, bedroom, and bathroom). Larger units are available to power the entire house. These are also very helpful in doctor/dentist and other small offices.