From https://en.wikipedia.org/wiki/High-voltage_direct_current https://en.wikipedia.org/wiki/High-voltage_direct_current : > HVDC transmission losses are quote

From https://en.wikipedia.org/wiki/High-voltage_direct_current https://en.wikipedia.org/wiki/High-voltage_direct_current : > HVDC transmission losses are quoted at [around] 3.5% per 1,000 km, about 50% less than AC (6.5%) lines at the same voltage 1000 km of HVDC has lower losses than a Tesla powerwall or almost any battery system I know of; likely less than the last 10km of transport to your device; also less than most AC->DC converters. Transport over 6000km would be about 20% losses, which is notable, but not too bad and could offset the need for quite a bit of storage. Though note that grid scale batteries are not workable. We need other solutions - create hydrogen, methane, ammonia/fertilizer, smelt aluminum, iron, cook concrete etc.