National Grid plc has entered into a series of major delivery contracts valued at close to £3 billion for its Eastern Green Link 3 (EGL3) electricity transmission initiative. The agreements represent a significant step in developing what the utility describes as the largest project of its kind in the United Kingdom.
Contract Awards and Project Scope
Hitachi Energy has been selected to supply the converter stations for the project, while cable specialist NKT has secured the contract for both subsea and underground cabling. NKT disclosed the value of its portion exceeds €2.2 billion, marking the single largest cable project award in the company's history. The system will be a 525 kilovolt High Voltage Direct Current (HVDC) link, a technology essential for efficient long-distance power transmission.
The planned route will stretch approximately 680 kilometers from Peterhead in Aberdeenshire, Scotland, to Walpole in Norfolk, England. Upon completion, the link is designed to have a maximum transmission capacity of 2 gigawatts.
Timeline and Approvals
Construction on the HVDC link is currently scheduled to commence in 2028, with a target for the system to be energized and operational by the end of 2033. This timeline remains contingent on receiving the necessary regulatory approvals. The sections of the project in England require a Development Consent Order (DCO), the key planning permission for nationally significant infrastructure.
In a statement, SSEN Transmission quoted National Grid's Mark Brackley, who called the contract signing a "major milestone." James Johnson of SSEN Transmission described EGL3 as a "vital investment," while Niklas Persson of Hitachi Energy highlighted the "central role" of its HVDC technology. NKT CEO Claes Westerlind labeled the contract a "significant milestone" for the firm.
Market and Regulatory Context
The project is strategically aimed at addressing high "constraint costs" within the UK electricity market. These are payments made to wind farms, particularly those located off the northern and eastern coasts, when they are instructed to reduce output due to a lack of transmission capacity to deliver the power to demand centers further south. EGL3 is intended to alleviate these grid bottlenecks, enabling more renewable energy to flow to where it is consumed.
The contract awards arrive as Britain's network operators prepare for the next regulatory price-control period, known as RIIO-3, which is set to govern revenues from April 1, 2026, through March 31, 2031. The project is being developed in partnership with SP Energy Networks, which is collaborating with National Grid on a separate but related link known as EGL4.
Risks and Challenges
Despite the advanced planning, the project's lengthy schedule introduces potential risks. Final permits from the Secretary of State for Energy Security and Net Zero have not yet been granted. Furthermore, large-scale subsea infrastructure projects can be susceptible to supply chain disruptions and cost inflation. Any significant delays would prolong the period during which the network continues to incur substantial congestion costs.
National Grid, a FTSE 100-listed utility, specializes in electricity and gas transmission and distribution across the UK and northeastern United States. The EGL3 project underscores its central role in the UK's transition to a cleaner and more resilient energy system.
