A generator that runs off of natural gas or propane with an automatic transfer switch is what you need for piece of mind. Prices vary depending on what you want to run in a power outage situation. Do a google search for Guardian generators, check out the guardian web site. I checked locally here in Northern Ohio, and I can have the 10k nat gas with transfer switch installed for around $3800.00. If you can get by with the 7k, it would be less and if you have the ability to install it yourself, much much less.