UK Approves 2GW Sea Link Power Connection Between Suffolk and Kent
The UK government has granted development consent for Sea Link, a 2-gigawatt electricity transmission connection between Suffolk and Kent. Approved on 30 October 2026, the National Grid project is intended to increase the network’s ability to move electricity between East Anglia and the South East, supporting renewable generation and easing pressure on existing infrastructure.
The decision advances a significant grid reinforcement as Britain adapts its electricity system to changing generation patterns and growing demand. However, approval has also drawn objections from local authorities concerned about the effects of onshore infrastructure and overlapping energy developments.
A New Route for Electricity
Sea Link will extend approximately 138 kilometres, with most of the connection offshore. It will use high-voltage direct current, known as HVDC, and allow electricity to travel in either direction according to generation levels and demand. National Grid says this will provide a route around existing network bottlenecks near London.
The approved plans include approximately 122 kilometres of subsea cable. The Suffolk landfall will be between Aldeburgh and Thorpeness, while the Kent landfall will be at Pegwell Bay. Underground cables will connect the coastal sections to onshore infrastructure, including converter stations near Saxmundham in Suffolk and Minster in Kent. These facilities will connect the HVDC link with the surrounding alternating-current transmission network.
The Department for Energy Security and Net Zero describes the connection’s capacity as equivalent to the electricity requirements of around two million homes. This comparison illustrates its scale: Sea Link will transport electricity through the national network rather than generate power itself.
Why Additional Grid Capacity Matters
Britain’s electricity network is being adapted to serve a different geography of generation. National Grid explains that much of the existing system was developed to carry electricity from fossil-fuel power stations in the North, Midlands and South Wales. Increasing offshore generation requires additional capacity in other locations.
The company expects electricity demand to increase by around 50% by 2035 and double by 2050 as transport, heating and other activities become increasingly electrified. Sea Link forms part of its Great Grid Upgrade programme to address these changing requirements.
Network congestion can prevent available electricity from reaching consumers. The government says Sea Link should reduce the need to pay generators to reduce output when transmission infrastructure cannot accommodate their production. It also expects the project to improve resilience and reduce exposure to volatile fossil-fuel markets. These are anticipated system benefits, rather than a quantified guarantee of savings for individual households.
Planning Consent and Financial Scrutiny
National Grid Electricity Transmission submitted its development consent application on 27 March 2025. The Planning Inspectorate accepted it for examination on 23 April, and recommendations were submitted to the government on 30 July 2026.
The examination allowed residents, local authorities, statutory consultees and other interested parties to present evidence. The Inspectorate said the process was completed within the statutory timetable.
Planning approval is distinct from regulatory scrutiny of project expenditure. Ofgem is assessing Sea Link under its Accelerated Strategic Transmission Investment mechanism within the RIIO-3 price control framework. This assessment determines the revenue and delivery outputs associated with the project.
Ofgem’s consultation page lists the assessment as closed and awaiting a decision. The regulator identifies increased transfer capacity, reduced network constraints and support for offshore wind and other low-carbon generation as the project’s intended functions.
Suppliers Prepare for Delivery
Siemens Energy has been appointed to build the converter stations in Suffolk and Kent. Sumitomo Electric will manufacture the subsea cable at its new £350 million factory at the Port of Nigg in Scotland.
National Grid says the factory will directly create more than 200 skilled local jobs, with a wider projected employment impact exceeding 400 jobs across the UK supply chain. Those figures relate to the manufacturing facility and its wider activity, rather than employment attributable exclusively to Sea Link.
Subject to detailed construction planning, work is expected to start in early 2027 and finish by 2031. National Grid will now progress delivery preparations and environmental commitments.
Local Concerns Remain
Suffolk County Council opposed the project throughout its examination and criticised the approval. Its concerns include construction access, disruption, environmental effects and the cumulative impact of multiple major energy projects concentrated in the county.
The council said it would focus on holding National Grid to commitments made during the examination and securing the promised protections and mitigation for communities.
In Kent, Thanet District Council also expressed disappointment. Council leader Rick Everitt said the authority would examine the detailed decision to establish how its concerns had been addressed and what mitigation measures had been included.
The next delivery stage therefore includes practical requirements alongside engineering work. National Grid says it must agree final technical details and obligations with local authorities and other stakeholders, including traffic and environmental management measures. For businesses and residents along the route, these arrangements will help determine how construction affects daily activity as the project moves towards delivery.
Sources:
Cut through the green tape
We don't push agendas. At Net Zero Compare, we cut through the hype and fear to deliver the straightforward facts you need for making informed decisions on green products and services. Whether motivated by compliance, customer demands, or a real passion for the environment, you’re welcome here. We provide reliable information. Why you seek it is not our concern.