Project Description

Mayflower Wind is 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.  No final decisions on site locations for project facilities will be made until a full routing analysis has been completed. 

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 Commonwealth a national hub for offshore wind.

In December 2018, Mayflower Wind was awarded the federal offshore lease area OCS-A-0521, which is located 
over 30 miles south of Martha’s Vineyard and 20 miles south of Nantucket.  The lease area has the potential to generate over 1,600 megawatts (MW) of low-cost clean energy, or enough to power over half a million homes.   

Mayflower Wind executed a 20-year power purchase agreement in January 2020 for 804 MW with the Massachusetts electric distribution companies, after successful selection under the Commonwealth of Massachusetts Section 83C II solicitation.  We expect to deliver clean energy from the project by the mid-2020s. 

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Project Description map

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.