You might even say it will ultimately require at least 51% of worldwide electricity production, to ensure no actor (including nation-states) can suddenly on-lin

You might even say it will ultimately require at least 51% of worldwide electricity production, to ensure no actor (including nation-states) can suddenly on-line additional capacity to seize control. And then if that's true, one might dream of a power plant arms race, where two competing nations build additional power plants as fast as possible to prevent the other from gaining enough electrical capacity to attack the network...