Transmission & Interconnection

Offshore

How did Mayflower Wind decide the route for the export cables?

Through technical analysis of the available grid connection points, Mayflower Wind identified Falmouth and Somerset, Massachusetts as the optimal delivery points to maximize the potential of the lease area capacity. We are pursuing dual export cable routes to deliver the power to electricity customers via two interconnection points.

Route alternatives are currently being evaluated according to environmental, technical, and commercial factors, and will be presented in the project’s Construction and Operations Plan (COP). No final decisions on site locations for project facilities will be made until a full routing analysis has been completed. Baseline surveys are currently underway to gather data on-site and assess the suitability of alternative sites for a complete and reasoned analysis of the alternatives.

Onshore

Where will the project make landfall?

Mayflower Wind is pursuing dual export cable routes to deliver the power to electricity customers via interconnection points at Falmouth and Somerset, Massachusetts.

We are examining two alternative landfall locations along Falmouth Heights Beach in Falmouth.

For the route to Brayton Point, landfall locations are being evaluated adjacent to the Sakonnet River on the northern portion of the Town of Portsmouth, Rhode Island as the cable makes it way to Somerset, as well as the southwestern side of the Brayton Point commercial site itself.

No final decisions on site locations for project facilities will be made until a full routing analysis has been completed. Baseline surveys are currently underway to gather data on-site and assess the suitability of alternative sites for a complete and reasoned analysis of the alternatives.

How did Mayflower Wind decide the route for the underground cable and overhead transmission line?

Transmission route options are currently undergoing evaluation as part of the Mayflower Wind Construction and Operations Plan (COP). Routing analysis for the onshore transmission infrastructure takes into consideration multiple factors, such as feasibility for construction, environmental resources, social impact, cultural resources, and other local concerns. The objective is to minimize impacts while aligning with safety, cost, and engineering considerations. Routing along existing linear infrastructure (such as existing utility right-of-way (ROW) and roads), previously disturbed areas, and existing cleared land are widely accepted as best practices.

No final decisions on site locations for project facilities will be made until a full routing analysis has been completed. Baseline surveys are currently underway to gather data on-site and assess the suitability of alternative sites for a complete and reasoned analysis of the alternatives.

What safeguards and practices will be deployed to avoid, minimize, or mitigate impacts to the coastal and near-shore environment from the cable landing?

Mayflower will be working with federal, state and local environmental agencies to avoid and minimize environmental impacts to the coastal and near-shore environment. The most effective method is to avoid direct impacts using construction methods, such as horizontal directional drilling (HDD) and time of year restrictions during seasonally important time periods. Potential impacts on the coastal and near-shore environment and environmental protection measures will be analyzed through the project’s Construction and Operations Plan (COP).

Interconnection

What is the project’s Point of Interconnection (POI)?

The Mayflower Wind project will interconnect into the regional electric grid through two distinct POIs in Falmouth and Somerset, pending ongoing interconnection studies.

What studies have been conducted to determine whether the project can safely and reliably interconnect into the regional grid?

Mayflower Wind is progressing through the Independent System Operator- New England (ISO-NE) study process to determine how the project can safely and reliably interconnect into the New England transmission system. This includes conducting a Feasibility Study and System Impact Study, which are performed to ensure that system reliability criteria and standards for no adverse impact are met.