Siemens Energy Awarded Contract for Key Elements of UK’s Eastern Green Link 4 Project

Siemens Energy has secured a contract to deliver two high-voltage direct current (HVDC) converter stations for the Eastern Green Link 4 (EGL4), one of a series of major subsea electricity connections planned between Scotland and England.

The award follows the company’s selection as preferred bidder in July 2025.

EGL4 is a 2GW subsea transmission link that will connect Fife in Scotland with Norfolk in England via a 530km cable running beneath the North Sea. Once operational, the link is expected to carry enough electricity to supply the equivalent of around 1.5 million UK homes.

Under the agreement with SP Energy Networks and National Grid Electricity Transmission (NGET), Siemens Energy will design and deliver converter stations at both ends of the link. These facilities will convert electricity from alternating current (AC) to direct current (DC) for transmission offshore, and then back to AC for integration into the national grid.

The wider EGL4 project comprises several key components, including substations in Fife and Norfolk, the offshore HVDC cable, and underground landfall connections linking the marine cable to onshore infrastructure. Italian cable manufacturer Prysmian is responsible for supplying both the subsea and underground cabling under a separate contract valued at around £2bn.

Financial backing for the scheme includes approximately £600M secured by ScottishPower, via its parent company Iberdrola, from the UK’s National Wealth Fund.

Industry stakeholders have described the project as an important step in strengthening the UK’s electricity transmission network. By increasing capacity between Scotland and England, EGL4 is expected to support the movement of renewable energy, reduce network constraints and contribute to overall energy security.

The project forms part of a broader programme of five subsea links planned along Britain’s east coast, aimed at improving resilience and enabling more efficient distribution of clean power across the country.

Subject to planning approval, construction is anticipated to begin in 2028, with completion targeted for 2033.