The Center for Regional Disaster Resilience (CRDR) is supporting the King County Region 6 Critical Infrastructure Committee's 2019 Long-Term Power Outage Workshop.
Many emergency managers are not yet "skookum" on this hazard — which, in a worst case, could be a TEOTWAWKI (The end of the world as we know it) type of event. Think no electrical power for months or year(s).
On the website above there is a good PowerPoint Geomagnetic Storm Threat to the Electrical System that will give you the basics, and yes there have been these events in the not-too-distant past.
I encourage you to become better informed on the hazard. My question for you is this. If you got a four (4)-minute warning of a CME headed toward Earth, what would you do: