Storms have knocked out power and you don't know if it's going to be for an hour, days or weeks. Portable generators are just what you need to bring power back while the power company works to restore your local power.
Generators have other uses too. Besides being ready for storms, you can use them while camping or tailgating. It's there to help run microwaves, electronic devices and charge your RV's battery. Inverter generators are quieter so you are less likely to disturb nearby campers.