The main thing to worry about is induced DC currents causing transformer cores to saturate, which instantly makes them into heaters, dissipating all incoming power.

DC blocking capacitors can be installed, or circuits to detect the saturation or DC current, or... cheapest of all in terms of equipment.... Shut down the grid before the storm hits, turn it back on when it is over.

No equipment required, but lots of political courage. A "black start" event isn't easy, but plans exist for them.