Iberdrola, through its British subsidiary SP Energy Networks, has awarded contracts for the development of the Eastern Green Link 4 (EGL4) subsea electricity interconnector between Scotland and England. Siemens Energy will build two high-voltage direct current (HVDC) converter stations, which will convert alternating current to direct current for more efficient transmission at 525,000 volts over long distances.
The electricity will travel around 640 kilometres, mostly under the sea, before being converted back for integration into the onshore grid. Eastern Green Link 4 will have a capacity of 2,000 megawatts, linking Fife in Scotland with Norfolk in England, and will be able to supply enough renewable energy for more than 1.5 million homes. The converter stations will be located in these two regions. Main construction is scheduled to begin in 2028, with commissioning expected in 2033. The contracts are worth over £3 billion (around €3.5 billion). The project complements Eastern Green Link 1, another 2,000 megawatts link whose construction began in 2025 and which will connect Torness in Scotland with Hawthorne Pit in England. That link is expected to be completed in 2029.
