This is highly variable. When I lived in rural Alabama, power outages sometimes would happen after strong thunderstorms but that was about it. More recently I lived in downtown Atlanta and power outages were pretty much a monthly occurrence. This was just down the street from the power company's headquarters and next to tourist attractions like the World of Coca-Cola and CNN. It still amazes me how fragile the power grid is in the central business district of a major city. How rural Alabama keeps power on better than the middle of a metro of nearly six million is a mystery.