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October 28, 2021

Siemens Energy to deliver HVDC transmission system to Sunrise Wind project

Once completed, Sunrise Wind will be the first offshore wind project in the US to use HVDC technology.

By Umesh Ellichipuram

Siemens Energy has secured a contract to supply a high-voltage direct current (HVDC) transmission system for New York’s first utility-scale offshore wind project, Sunrise Wind, in collaboration with Aker Solutions.

The project, which has a capacity of approximately 924MW, is located nearly 50km east of Long Island and is developed by a joint venture of Ørsted and Eversource.

Renewable energy generated by the facility will be sufficient to power nearly 600,000 New York homes while supporting the state in meeting its goal of 100% clean electricity by 2040.

The project will help bring clean energy from the offshore facility to the mainland.

Siemens Energy will deliver the transmission system, which will include offshore and onshore converter stations, on a turnkey basis.

Through an inter-array cable system, the offshore converter station will receive 66kV alternating current (AC) power from the offshore wind farm, which will be converted into 320kV direct current (DC).

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Upon conversion, the DC will be transmitted to the onshore converter station, located at Holbrook on Long Island, with the help of a 160km export cable.

The onshore substation will convert the DC electricity back to AC in order to supply the power to the distribution grid.

Upon completion, Sunrise Wind will become the first offshore wind project in the US to use HVDC technology.

In addition to the HVDC system, Siemens Energy has agreed to provide onshore civil works by partnering with the local companies.

The onshore converter station installation works will be executed by local companies, and the final deliveries are planned for the second half of 2025.

Aker Solutions will provide a platform with a steel jacket substructure as well as a topside platform deck to house the electrical equipment for the project.

Siemens Energy executive board member Tim Holt said: “To date, we have connected the offshore grid to the mainland 21 times, bringing more than 12GW of wind power to households in Europe.

“Carbon-neutrality goals will not be met without wide-scale deployment of renewable energy projects like Sunrise Wind.”

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