I have to say that this is one of the dumbest ideas I've heard in a long time. Like "you have to be dropped on your head as a baby" dumb.
Let's say the cable is 5000 miles long. How much power dissipation is there going to be over this distance?
Let's say the cable is 5000 miles long. How much power dissipation is there going to be over this distance?
Not much, and it should be efficient enough to make economic sense.
Note that the article says it is 3700km, not 5000 miles.
Ultra high voltage lines lose about 3.5% per 1000km[1] (although this is improving). In China they have multiple 3000km+ lines, eg[2].
Some estimates indicate the US could reduce generation emissions by at least 80% with better long distance transmission capacity[3].
[1] https://en.wikipedia.org/wiki/High-voltage_direct_current
[2] https://spectrum.ieee.org/chinas-state-grid-corp-crushes-pow...
China already built a 12GW connection over 3000km for example. That was not a submarine cable, though. https://en.m.wikipedia.org/wiki/High-voltage_direct_current