I'm not an American, but Australia has a comparable number of power outages. A big factor is cost, and population density is what causes cost to be a concern. The EU has a population density that's three times higher than the US; underground lines are three times more expensive than overhead.

Australia is of course ten times less dense than the US, comparable to Idaho, but we have a unique combination of moderately dense land in the east and south west plus shockingly sparse areas with little to no infrastructure at all.