Gotland HVDC Link (1954)
Sweden commissioned the world's first commercial high-voltage direct current (HVDC) link, a 20 MW, 98-kilometer submarine cable connecting the island of Gotland to the mainland. It was built mainly to transmit surplus wind power from the island.
Gotland's wind power became sellable to the mainland, and the technology proved HVDC could cross open water efficiently.
HVDC became the standard for long-distance and submarine power transmission worldwide, with voltages and capacities rising steadily over seven decades.
The Heart of the Sea Wind is the direct descendant of this first link — same physics, same purpose, but 100 times the voltage and carrying far more power from dozens of turbines.
