There are occasional large scale electrical blackouts caused by solar flares.
My question is: what affects the severity of the problem?
It obviously depends on the energy of the flare, which we can do nothing about.
But does it also depend on the length of the power line, the material it is made from, and/or the current or voltage on the line, at the time of the flare?
Does it affect high tension transmission lines more than say, low current carrying telephone lines?
And, most importantly of all, what can utility companies do, if anything, to mitigate the effects of the flare?