The 800MW Vineyard Wind One offshore wind farm, located about 15 miles (24 kilometres) off Massachusetts, has reached full commercial operations.
Vineyard Wind spokesperson Craig Gilvarg confirmed the date to local news outlet WBUR. Full commercial operations means every turbine has completed commissioning and is operating, with individual units taken offline as required for maintenance.
The US$4.5 billion project, a joint venture between Avangrid and Copenhagen Infrastructure Partners, comprises 62 GE Haliade-X turbines rated at 13 MW each.
The turbines are spaced one nautical mile apart in lease area OCS-A-0501 south of Martha's Vineyard and Nantucket. Power is exported via two submarine cables to Covell's Beach in Barnstable.
The wind farm began producing electricity in January 2024, and offshore installation was completed on March 13, 2026, when the final blade was secured to the 62nd turbine. Power purchase agreements with Eversource, National Grid, and Unitil were activated in April.
On July 13, 2024, a blade failed on turbine AW-38, prompting the Bureau of Safety and Environmental Enforcement (BSEE) to halt additional blade installation and power generation. Limited tower and nacelle installation resumed that August, and the BSEE lifted its suspension on January 17, 2025.
The Bureau of Ocean Energy Management ordered a 90-day suspension of project activities on national security grounds on December 22, 2025. A federal court stayed the order on January 27, 2026.
In April, a judge ordered turbine supplier GE Vernova to remain on the project after the company had sought to terminate its agreement over US$360 million it said was unpaid. The parties announced a settlement on September 16.
The neighbouring 704MW Revolution Wind project announced full operation on Thursday, November 5.
"With the project at full commercial operation alongside Revolution Wind, offshore wind will bring down the price of electricity even further in New England," said Massachusetts Governor Maura Healey.
Operations and maintenance are based at Vineyard Haven, where Tisbury Marine Terminal can support up to three crewboats, alongside a helicopter hangar at Martha's Vineyard Airport.
Vessels assigned to the project include the 30-metre Windea Intrepid.
