New Report from Schatz Energy Research Center Examines Electrical Transmission Challenges for Regional Offshore Wind Development - Lost Coast Outpost
New Report from Schatz Energy Research Center Examines Electrical Transmission Challenges for Regional Offshore Wind Development | Lost Coast Outpost | Humboldt County News
A 9.5-megawatt floating wind turbine deployed at the Kincardine Offshore Wind project, located off the coast of Aberdeen, Scotland. Photo: Principle Power.
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Press release from the Schatz Energy Research Center at Cal Poly Humboldt:
A new report from the Schatz Energy Research Center at Cal Poly Humboldt evaluates potential scenarios for electric grid transmission development to support floating offshore wind along the northern coast of California and the southern coast of Oregon. The scenarios include onshore and offshore (undersea) transmission systems, with interconnections ranging from 7.2 to 25.8 gigawatts of generation capacity. The study encompasses multiple possible wind farm sites between Coos Bay, Oregon and Cape Mendocino, California, including the two currently awarded lease areas located 20 miles off California’s Humboldt Bay, and two Draft Wind Energy Areas near Brookings and Coos Bay, Oregon.
Because the existing transmission infrastructure in these rural, coastal areas is very limited, major investments will be required to support offshore wind development. This report estimates that transmission infrastructure costs could range from $7.5 billion for a 7.2 gigawatt wind farm to as much as $41.3 billion for a 25.8 gigawatt buildout. For the 7.2 gigawatt scenario, annual system-wide benefits are estimated to be roughly $1.2 billion, when compared to a base case without offshore wind generation. These savings include both production cost savings and greenhouse gas emissions savings; the latter is valued at $72 per metric ton of avoided emissions, based on the EPA’s projected social cost of carbon.
The report examined combinations of onshore and offshore transmission solutions, utilizing both high-voltage alternating current (HVAC) and high-voltage direct current (HVDC). Estimates also included the costs to deliver wind power to nearby coastal communities. The analysis indicated that coastal communities near wind farms could be connected to the new transmission infrastructure, thereby increasing the reliability and available capacity of electricity in those areas, for only 0.4% to 2.4% of the overall cost of the transmission upgrades.
This study also includes a preliminary assessment of anticipated permitting challenges related to environmental impacts, land use conflicts, and undersea cable routing. The findings indicated significant variations in permitting difficulty, ranging from low to very high among the various possible routes.
Because the Pacific offshore wind buildout will take decades to accomplish, the report emphasizes that infrastructure investment decisions made in the early phases must be informed by expected long-term strategies—both to minimize cost and impact, and so that developments do not become stranded. Proactive, regional transmission planning is critical. Likewise, technologies installed today must be designed to adapt to future solutions.
Recommended next steps include taking a more detailed look at near-term transmission needs for the first phase of offshore wind development; a detailed analysis of transmission routes, land ownership, and rights-of-way; and an assessment of the potential to couple battery energy storage with offshore wind.
This study was funded by the California Energy Commission and the Office of Local Defense Community Cooperation of the U.S. Department of Defense, and developed in close collaboration with the Oregon Department of Energy. Technical project partners included the National Renewable Energy Laboratory, Quanta Technology, H. T. Harvey & Associates, Mott MacDonald, and Conaway Geomatics.
The Schatz Energy Research Center is located in Arcata, California on the campus of Cal Poly Humboldt. Since 1989, the Schatz Center has led innovative research and design programs in offshore wind, microgrids and resilience, clean transportation, emissions and air quality, and off-grid energy access.
Related Knowledge Center: Offshore wind energy
Over the next decade, U.S. offshore wind power is expected to grow from a single 30-megawatt wind farm off Rhode Island to more than 2,000 MW of capacity along the Atlantic Seaboard. There are contracts for wind power off the coasts of Massachusetts, Connecticut, New York, Maryland, New Jersey, Rhode Island, and Virginia.
The National Renewable Energy Laboratory has estimated the United States has over 4,000 gigawatts (GW) of offshore wind potential, enough to power the country four times over.
The growth in part being spurred by state solicitations, including in New York, where then-Gov. Andrew Cuomo (D) set a commitment of 9,000 MW of offshore wind by 2035, and in Connecticut, where in June 2021, Gov. Ned Lamont (D) signed legislation authorizing the construction of 2,000 MW of offshore wind by 2030.
The offshore development is also being driven by an investment tax credit set to end in December 2019 and is equal to 12 percent of expenditures. U.S. Sens. Susan Collins (R-Maine) and Tom Carper (D-Del.) have introduced a bill to extend the tax credit for up to eight years.
The Interior Department has held eight competitive lease sales that resulted in 15 offshore wind leases over 1.7 million acres that has the potential for 21 GW of capacity. In February 2022, the Bureau of Ocean Energy Management completed a bidding process that realized $4.37 billion for 488,000 acres across six lease areas in federal waters off New York and New Jersey.
Projects have also been proposed off the Southeast coast, off California and Hawaii, and for the Great Lakes.