A lot of people have trees growing over, or very close to, power lines; during storms, high winds or ice accumulation cause many branches to break. Around here, utility crews periodically prune trees back from the wires, but a significant storm will still see hundreds of thousands without power. After a day or two they get it down to tens of thousands; fixing all of those can take many days. One downed power line can be repaired in an hour, but 1000s take a while. Some of the tail-end of repairs are more complicated, too.
Hurricanes, long-track tornadoes, and earthquakes are even worse.
It's not that technology is lacking, it's that the cost of making infrastructure resilient to very bad weather (worse than Australia sees) is too high. Most people who want to do something about it buy a generator, which solves most of their problem even though in aggregate it's terribly inefficient.