A gas-powered portable generator is the most basic backup generator and can get you through a short-term blackout, according to AccuWeather. Place it in your yard and plug it into your home using extension cords.
Portable generators often cost between $500 and $1,500 depending on the model.
A standby generator is much more powerful and convenient. It immediately turns on when the power goes out, but your wallet will take a hit. They cost between $5,000 and $15,000 dollars.