Project Description

In December 2021, Mayflower Wind was awarded a 400 megawatt (MW) power purchase agreement by the Commonwealth of Massachusetts and its three biggest utilities as part of Massachusetts’ 83C III offshore wind energy procurement.  Combined with its 804 MW PPA from the 83C II solicitation, the project will provide more than 1,200 MW of low-cost clean energy to electricity customers throughout Massachusetts and New England.   

The flexibility offered by pursuing dual delivery points– at Falmouth and Somerset, Massachusetts– enables Mayflower Wind to maximize the potential of the lease area generation capacity. 

We are currently focused on conducting baseline surveys, stakeholder outreach, and other activities that advance the initial design, engineering, and permitting of the project. The project will require local, regional, state, and federal permits and approvals for relevant onshore, nearshore, and offshore work. 

These efforts have been, and will continue to be, pursued with input from local communities to ensure a safe, reliable, and responsible project that meets the expectations of Massachusetts ratepayers and makes the SouthCoast region a hub for offshore wind. 

The work we are doing on the SouthCoast is convergent with our ongoing work on Cape Cod. From Falmouth to Fall River and surrounds, Mayflower Wind stands ready to bring the state’s clean energy goals to reality while supporting the people and communities who help bring the benefits of renewable offshore wind energy to our shorelines. 

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Brayton Point area export cable routing map
Project infographic
Wind Turbines – Wind turbines convert kinetic energy from the wind into electric power.

Offshore Station – The offshore substation enables the wind farm to operate more efficiently by stepping up voltage from 66 kV to 275 kV.

Landfall – The export cables connect onshore via an underground conduit tunneled deep beneath the beach.

Underground Cables – From the beach area, electric cables will be buried beneath town roads and transmit power to the onshore substation.

Onshore Substation – The onshore substation transforms the power to grid voltage, stepping up from 275 kV to 345 kV.

POI – The point of interconnection, or the point where Mayflower Wind’s facilities interconnect with the Transmission Owner’s facilities.

Interconnection Switching Station – The interconnection switching station collects power from the overhead lines and feeds into the transmission system.

Inter-array Cables – Electrical cables connect wind turbines to each other and transport power to the offshore substation at 66 kilovolts (kV).

Export Cables – Submarine cables buried beneath the seafloor transmit electric power from the offshore substation to the onshore substation.

Overhead Lines – An overhead 345 kV transmission line transports the power to an interconnection switching station.

Transmission System – An interconnected network of transmission lines that deliver electricity to end customers.