Scary that if one place goes all these places black
 

What if US is built this way all over.
So if a terrorist knocks out a few of these "hubs" maybe 50%
of the US is blackout ?!

The "cascade effect" across power grids is an extremely rare event. While always a possibility, the last time it happened in NY was over 30 years ago. It's nothing to worry your Swedish meatball over ...