India Business News: India and Saudi Arabia on Monday set out to transform their traditional oil buyer-seller relationship into an energy transition partnership by agreein
Currently the longest inter-connector is the NorNed cable between Norway and the Netherlands. At 580km, it is the longest submarine power cable in the world, with a capacity of 700MW. However, the very latest cable technology has the potential capability of reaching up to 1,500km.
So apparently there are some long ones
https://www.escaeu.org/articles/submarine-power-cables/