Mayflower forges gigascale 'SouthCoast Project' offshore giant from US Atlantic project pair

Merger of Shell-Ocean Winds joint venture's 800MW and 400MW Massachusetts developments aims to leverage contracted 'offshore wind ready' power transmission assets at former coal-fired power plant at Brayton Point

Joe Biden.
Joe Biden.Foto: GPA Photo Archive/White House / Adam Schultz https://creativecommons.org/publicdomain/mark/1.0/
Massachusetts-based developer Mayflower Wind has jumpstarted the process of merging its two active offshore wind projects off the coast of the New England state into a single complex to take advantage of transmission grid capacity at the site of the former coal-fired power plant at Brayton Point, where produced power from the combined 1.2GW plant will come onto the US grid.
The plan is to dovetail Mayflower’s 804MW flagship, to be built on acreage awarded by Massachusetts in 2019, and its second, a 400MW project won last year, into one mega-development, dubbed SouthCoast Project, which would share a single ‘point of injection’ (POI) into the onshore power network.

Mayflower, a joint venture (JV) of Shell New Energies and Ocean Winds – a tie up between Engie and EDPR, had originally slated its first project to make landfall at Falmouth on Cape Cod.

The move by Mayflower was sparked by a transmission study from the New England Independent Systems Operator (ISO-NE) that found that the Falmouth location would requires costly and time-consuming upgrades to handle incoming wind power production, which in turn would delay the project from beginning to deliver power onto the grid on schedule.

The former 1.6GW Brayton Point site was targeted for redevelopment by renewable energy grid solutions provider Anbaric as an offshore wind POI due to its high-specification grid interconnectivity infrastructure, making it able to accommodate Mayflower landing its full production of its offshore wind power with little new investment.

“Our interconnection site at Brayton Point is ready to take that power and feed it to the grid,” Daniel Hubbard, director of external affairs at Mayflower told Recharge. “The transmission system on Cape Cod [at Falmouth], however, will require significant grid upgrades to be able to accept the offshore wind power planned to connect there.”

The developer filed an application with the Massachusetts Department of Public Utilities to merge its two 20-year power purchase agreements, too, approval of which will clear the way for the JV’s $119.8m investment in ports and infrastructure along the state’s coast, as well as training and education for workers, applied research and marine science, and support for low-income electricity consumers.

Mayflower Wind CEO Michael Brown underlined that the commitments made by his company were “tangible” investments. “Mayflower has binding agreements with more than ten organisations in the region,” he said.

“Mayflower’s economic development commitments will be distributed throughout the Southcoast and beyond to help deliver positive economic change and social justice, foster local workforce and supply chain development, and meet [Massachusetts’] goals for clean, renewable energy.”

The JV will likely interconnect any further offshore wind development at Falmouth, Recharge understands. Mayflower has at least 1.2GW of remaining capacity in its lease holdings.

“While NEISO and the utility companies resolve the [grid transmission] issues, Mayflower will continue to pursue its landfall and infrastructure in the town of Falmouth so that for future procurements and when the grid is ready, we will be able to deliver our clean power to the people of Massachusetts,” Hubbard said.

Massachusetts is aiming to have 4GW contracted by 2027, and 5.4GW by 2035. The state already has 3.2GW under development, including the first commercial-scale project to begin construction, the 800MW Vineyard Wind 1. Vineyard Wind has already begun onshore construction and will move offshore next spring, sparking what the Biden administration hopes will be movement towards 30GW of offshore wind capacity off American waters by 2030.
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Published 27 May 2022, 19:58Updated 16 October 2023, 16:27
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