There are a number of technical errors in this article, including this absurd statement: "It is limited to 765 kilovolts (kV) per line, which is more than enough to fry an egg by itself ..."

What on earth does the frying of eggs have to do with high voltage? You can generate an enormously high voltage by rubbing a piece of amber across a piece of silk, but it will dissipate with a harmless spark when grounded. No eggs will be fried, guaranteed!

And the losses from AC transmission have a LOT more to do with the induction between the conductors than interaction with the insulation. But whatever.

A point I was waiting to see you discuss, and you didn't mention it, was the danger of DC vs. AC. Any human contact with a current-carrying DC conductor over about 100 volts will cause muscles to clamp around the conductor, lowering the resistance, which increases the current, creating a runaway situation leading typically to death (injuries and death come from current, not voltage). With AC, because the voltage is constantly passing through zero, it is possible to pull away when one feels a shock.

Obviously, this is not an issue in the case of transmission lines at hundreds of kilovolts, where any contact--or even proximity--will cause instant death in either case, but it seems to me it's worth noting in a discussion of the pros and cons.