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The Tufts University Power Systems and Markets research group
provides public information on the global transition to renewables.
This information supports decision making in the long-term
interest of society. In recognition of the Massachusetts Department
of Energy Resources (DOER) 2020 requests for information
regarding Offshore Wind Transmission, this report focuses on the
Massachusetts and Rhode Island Wind Energy Areas and their role
in ISO New England’s transition to renewables.
2020 DOER Timeline
January 15: Request for Round 1 Comments
February 18: Responses Submitted
March 3: Technical Conference
March 19: Request for Round 2 Comments
April 21: Round 2 Comments Due
May 12: Tufts Final Report Complete
Major Themes:
1. Long-Term Health of OWE Industry
2. Grid Reliability, Resilience, and Redundancy
3. Environmental Impacts
4. Social Impacts to Coastal Communities
Impacts toEnvironment
Impacts toCoastal Communities
Ocean
Land
Focus Area
Proposed Generation by Type in ISO-NE Queue.
Offshore Wind Transmission in New England
12729MW
13250MW
14800MW
20573MW
20927MW
2016 2017 2018 2019 2020
Offshore Wind Procurements
Proposed Offshore Wind
Proposed Land-Based Wind
Other Proposed Generation
464
3779
8486
2054
3795
7401
8004063
4489
6248
1600
9500
3955
7118
1600
13500
756
6671
Vineyard Wind I Procured Mayflower Wind I Procured
Scenario Comparison:
• Scenario 1 causes more seafloor disturbance in critical resource areas than Scenario 2
• Scenario 2 requires more intense regional coordination and larger up-front investment than Scenario 1
• Scenario 2 requires added expense from HVDC inverter stations (depicted as square grey nodes where offshore cables converge)
• Scenario 2 may have grid balancing benefits not realized in Scenario 1. Further analysis is forthcoming in a whitepaper entitled, Networked Transmission vs. Generator Lead Lines: A Comparative Study of Offshore Transmission Approaches for the Massachusetts and Rhode Island Wind Energy Areas, which the Tufts research group plans to publish in May.
Key Assumptions:
• Policy and technical limitations are drawn from information available in March 2020
• DC transmission is used for export cable length longer than 80 mi unless developers specify otherwise.
• Turbines are situated in a 1 nautical mile grid
• Each black node in Scenario 2 represents a location where one or more 1,200 MW HVDC substations can be sited to service multiple transmission lines
• Each turbine has a capacity of 12 MW, unless otherwise noted
• Each block is approx. 800 MW, unless otherwise noted (or wind energy area cannot be divided into even 800 MW projects)
Scenario 1: Generator Lead Lines
Developer Project Name Project Capacity (MW)
Turbine Capacity (MW)
Substation # of Cables
Voltage (kV)
Type
Orsted/Eversource South Fork Wind 120 8 Buell Lane (East Hampton, NY)
1 138 AC
Orsted/Eversource Revolution Wind 704 8 Davisville (North Kingston, RI)
TBD TBD AC
Orsted/Eversource Sunrise Wind 880 8 Holbrook (Ronkonkoma, NY)
TBD TBD AC
Vineyard Wind Vineyard Wind 1 798 9.5 Barnstable Switching Station (Barnstable, MA)
2 220 AC
Vineyard Wind Park City Wind 804 12(assumed)
West Barnstable Substation (Barnstable, MA)
TBD TBD AC
Mayflower Wind Mayflower Wind 1 804 12(assumed)
Bourne Switching Station (Bourne, MA)
TBD TBD AC3
Existing ProjectsScenario 2 depicts existing projects with HVAC transmission as specified by the developers. Due to current limits on technology, an 800 MW project requires two 400 MW AC cables. Hence, AC transmission is represented by two parallel lines.
Scenario 2: Independent Transmission Network
Contributors:
Samuel Lenney is a master’s student studying electrical engineering at Tufts University. He focuses on trends in developing technologies related to offshore wind transmission and the challenges and opportunities they bring.
Oliver Marsden is an electrical engineering senior. He specializes in technical knowledge, public speaking experience, and financial proficiency for budding interdisciplinary fields within renewable technology.
Sean Murphy is a civil engineering senior. He specializes in water, transportation, and energy systems. Sean has worked on energy from government, utility, and academic perspectives.
Kelly Smith is a master’s student studying offshore wind energy engineering at Tufts University. Kelly is a licensed Professional Engineer in Massachusetts as well as a Certified Floodplain Manager and Envision Sustainability Professional. She currently serves on the board of New England Women in Energy and the Environment.
Chisaki Watanabe is a master’s student at the Fletcher School. Her research focuses on climate change diplomacy and energy security. She was an energy reporter for Bloomberg News in Tokyo and covered power markets and renewable energy in Japan and other Asian countries.
Eric Hines, Ph.D., P.E., F. SEI directs the offshore wind energy graduate program at Tufts University, where he is the Kentaro Tsutsumi Professor of the Practice in structural engineering. Dr. Hines has over 20 years of experience designing innovative infrastructure and large-scale structural tests.
Barbara Kates-Garnick, Ph.D. is a professor of practice at the Fletcher School. She recently served as Undersecretary of Energy for the Commonwealth of Massachusetts (EEA). Her prior work in public service includes Commissioner of Public Utilities (MA DPU)., Assistant Secretary of Consumer Affairs, and Director of Rates and Research (MA DPU).
Aleksandar Stankovic, Ph.D., F.IEEE, is the Alvin H. Howell Professor of Electrical Engineering. Dr. Stankovic has over 30 years of experience in power systems engineering and control.
Sources:
• Anbaric. (2019). Press Release: Anbaric Files with BOEM to Develop Independent Ocean Grid for Southern New England. Wakefield, MA.
• ESS Group. (2014, September). Offshore Wind Transmission Study Final Report. https://files.masscec.com/research/MassCECOSWTransmissionStudy.pdf
• ISO New England, Inc. (2018). ISO New England System Diagram.
• ISO New England, Inc. 2016-2020 Regional Electricity Outlook. https://www.iso-ne.com/about/regional-electricity-outlook/
• Land Transmission Data: The Homeland Infrastructure Foundation-Level Data (HIFLD) Substation Update 10/7/2019; Line Update 9/24/2019
POWER-USMASSACHUSETTS
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