Your comment is too long and conflates high and low frequencies. There are very few natural high frequency sources, all of which would come from outside the solar system. The likelihood is close to zero. The low frequency events, whether manmade or solar, are only going to affect long lines and mainly transformers. The manmade high frequency sources are difficult to create, and unlikely to be done effectively.
My post #33 was only too long for those with a short attention span.
As for conflating high and low frequencies, I’m no engineer, let alone an expert in the area of EMP. However, I carefully laid out my sources and let them speak for me.
The Carrington Event speaks for itself. So does Starfish Prime and Soviet Test #184. Is our electrical grid different than in 1859 or 1962? Yes, certainly. In some ways it is more vulnerable, in some ways less so. We are also FAR more dependent upon electrical and electronic devices than at any time in history, so any pulse (from whatever source) that would effect transformers, long lines OR electronic devices would have effects - perhaps devastating effects. What I cannot stand here (and in society in general) is the Normalcy Bias (which I incorrectly listed as “Confirmation bias” in my Post #33) that says that such effects are impossible - people need to get informed before shooting off their mouths (or keyboards).