If you have ever lost power for a couple of days at your home this is a great solution.
An integrated generator can be powered with natural gas which most homes already receive and can automatically come on only seconds after a power loss. A majority of your home appliances can be run simultaneously with a properly sized generator.
A great company to start with that provides these systems is Generac. They make a wide variety of products to fit every situation and have been around for over 50 years.