Siemens Energy selected for National Grid converter stations in Suffolk and Kent
National Grid has chosen Siemens Energy as its preferred bidder to build two converter stations for the Sea Link project, a major electricity transmission upgrade connecting Suffolk and Kent
National Grid has named Siemens Energy as the preferred bidder for two high voltage direct current (HVDC) converter stations in Suffolk and Kent, marking a key milestone in the development of the Sea Link electricity project.
Sea Link is a proposed 2-gigawatt subsea transmission system designed to carry electricity between Pegwell Bay in Kent and a point on the Suffolk coast between Aldeburgh and Thorpeness. The 138km, 525kV cable will run mainly under the southern North Sea and across the Thames Estuary.
The converter stations will connect the subsea cable to existing onshore transmission infrastructure, enabling the transfer of renewable and low-carbon power to homes, businesses and public services in both regions. Construction of the project is expected to begin in 2027, subject to planning consent.
Adrian Pierssene, Project Director for Sea Link, said:
“This is a major milestone for Sea Link – a vital part of Great Britain’s energy network, designed to meet rising demand and strengthen energy security. Siemens Energy, a leader in advanced energy technology, brings specialist expertise that will support the delivery of the infrastructure needed for the UK’s future energy network.”
HVDC technology is being used in the project to efficiently transmit large volumes of electricity over long distances. The converter stations in Suffolk and Kent will play a central role in integrating the cable with the wider network.
Mark Pilling, Vice President of Grid Solutions Europe at Siemens Energy, said:
“Sea Link is another crucial step in our efforts to meet the UK’s expanding electricity needs, delivering security of supply and reinforcing our grid – a key part of our energy transition. We’re looking forward to continuing our strong working relationship with National Grid.”
The preferred bidder announcement follows a competitive procurement process and allows Siemens Energy and National Grid to begin planning for the project. However, it does not affect the outcome of the ongoing Development Consent Order application, which is still under consideration by the Planning Inspectorate.
Sea Link is part of The Great Grid Upgrade – a large-scale infrastructure programme by National Grid aimed at improving electricity capacity across England and Wales to support the UK’s transition to clean energy.