Or, the grid operators could monitor space weather information. (Which they do.)
We have multiple satellite systems (ACE, SOHO, STEREO, etc.) that can detect CMEs nearly as soon as they happen. The travel time to earth, even for the Carrington Event was 18 hours.
With an even shorter warning, you can do a lot to minimize damage.
In that time, you can declare nationwide power emergencies, shed load and shut down vulnerable systems.
Yes, it's ugly and takes time to come back up, but it's a lot better than zapping the whole long distance transmission system.
Much of the really critical infrastructure can disconnect and run on internal generators.
Are there places that will get caught by it? Sure. Will it be a major pain in the kiester? Of course. But it'll hardly be the "Collapse of Civilization"(tm).