Developer Vineyard Wind has set the seal on a milestone deal with Massachusetts transmission system operator ISO New England that will enable its eponymous 800MW offshore wind project in the US Atlantic to export electric power into a regional grid in the northeastern state once online.

The transmission agreement is the fledgling sector’s first for a utility-scale array in federal waters, but also gives Vineyard a first-mover advantage to access one of a limited number of onshore grid-connection points on the eastern seaboard.