In Depth: Building a US offshore transmission backbone

Landmark first marine surveys along the route of a proposed $5bn transmission system off the eastern coast of the US are due to begin this autumn.

The Atlantic Wind Connection (AWC) is a long-distance, subsea electricity “super-highway” that would connect future wind projects in the waters off New Jersey, Delaware, Maryland and Virginia to the mainland grid.

The high-voltage direct-current (HVDC) trunk­line, with several spurs designed to take 7GW of electricity from offshore wind developments and feed it into the four states’ distribution networks, would provide the infrastructure to supply wind energy to two million homes in the region.

Despite support from heavyweight “sponsor” investors including internet behemoth Google, Swiss green-energy private-equity firm Good Energies,…

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