What you'll find here is one of the most thorough resources available (for your own use and to pass along to your family and friends) about the threat to the power grid.
President Obama acknowledged the existential threat our vulnerable power grid poses to our civilization on October 13, 2016, by signing an Executive Order to prepare the Nation for space weather events. This is significant to me because I finished the first draft of my thriller Patriarch Run, which highlights the vulnerability of the grid in realistic and accurate detail, in 2010. At that time, people simply weren't taking the threat to the grid seriously. They are now!
If a Carrington-class or larger event were to hit, transformers would fail everywhere. Power at a global scale would be disrupted for weeks, months, possibly even longer.