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The article says that a 100-mile 765kV transmission line loses 1.5% to 0.5%. Let's be optimistic and assume we can get closer to the latter and deliver 99.5% of original power over 100 miles. NYC-LON is 3,466 miles on the shortest possible path. Let's call it 3,500 miles. Over that distance, we'd deliver 99.5% ^ (3,500 / 100) = 83% of our original power.

The circumference of the earth at the equator is 24,901 miles. Halfway around the world, we'd deliver 29% of original power.

Local kinetic storage like pumped hydro have an efficiency advantage over batteries (at least with current tech)

at that scale, thousands of miles, and enough power to drive a continent, maybe superconducting cables are worth it.