And for folks saying this is someting no one is paying attention to. That is not the case. US DOD, DOE, DHS, NSA, FAA, and DOI all have programs looking at this seriously for at least 20 years. There are a number of transmission working groups trying to figure out the best place to put breakables, transformer makers are looking at increased shielding with new alloys and painted on coatings in certain key points. DOD has a purchasing guildines and Milspec transformers, DOE has financial assistance programs and testing sites, DOI and DHS track solar flares and send guidance to transmission operators. But most of the answers here are really boring so they dont get much publicity as we are talking about fuses, paint, operational resiliency best practices.

source: been in the energy biz for 20 years and currently work at a utility managing power supply. So, not an engineer or a lineman with direct operational experience. Ive just been around this stuff for a long time