Most EMP strikes are trivial to defend against with a properly grounded Faraday cage. Many datacenters are protected against EMP's as well.
Can your power grid handle a Solar flare of X-Class higher than 40? Do you know, that it will happen one day, and will be aimed directly at us? Do you also know it has happened in the late 19th century, but thankfully back then we were not as advanced as we are now.
Well it is pointless to discuss in such a thread. Its purpose is to spread fear among the people who use Bitcoin. Some don't even understand what such a Solar flare would do. Some even made threads before asking what would happen to Bitcoin in such a scenario.
Interesting thing: it's very rare to see an older member (those who are here since the beginning) make such a thread (I myself haven't seen one).