If you read the article it is talked about and explained.
I have no idea if we will be hit by another Carrington Event or not, My goal when I post such is to make people realize just how much our modern society relies of electrical power. Rather it EMP, a Carrington Event, hackers, or saboteurs, all of which have capacity to bring our electrical gird to its knees. As be pointed out by myself and many others our capacity to replaces most of the largest of transformers is very limited and spares of these are almost non-existent. A major event caused by any of this things could leave vast swaths of the country without electrical power for months and months. That means no clean water, not sewage treatment and so on and so on...
Oh guilty. (got sidetracked)