The Government has approved a major undersea electricity connection between Suffolk and Kent despite objections from local authorities and residents concerned about the environmental impact and disruption caused by the project.
The Sea Link development, proposed by National Grid Electricity Transmission, received formal development consent on Friday 30 October 2026 following an examination by the Planning Inspectorate.
The project will provide a two-gigawatt electricity transmission connection between the two counties, primarily through an offshore cable route. Ministers say it will strengthen Britain's electricity network, improve energy security and allow more domestically generated power to reach homes and businesses. Suffolk County Council has criticised the decision, arguing that important concerns remain unresolved.
What is the Sea Link project?
Sea Link is a planned 138-kilometre high-voltage electricity connection between Suffolk and Kent. The development will include an undersea cable, underground onshore cables and converter stations in both counties, connecting the new infrastructure to the existing electricity transmission network.
The connection will be capable of transmitting up to two gigawatts of electricity, equivalent to the power requirements of approximately two million homes. That comparison describes transmission capacity rather than a promise that the project will generate electricity or directly supply two million additional households.
National Grid says the project will help move electricity between different parts of the country, relieving pressure on existing transmission routes. It forms part of the company's wider Great Grid Upgrade programme.
Government says project will strengthen energy security
The Department for Energy Security and Net Zero says Sea Link will help Britain make better use of domestically generated electricity, including power from renewable sources. The Government argues that congestion on the existing network can result in electricity generators being paid to reduce output when the grid cannot transport their electricity to where it is needed.
Additional transmission capacity could reduce those constraints and improve reliability. Energy Minister Michael Shanks welcomed the approval, linking the project to plans to modernise the electricity network and reduce exposure to volatile international fossil fuel prices.
However, the Government has not established that Sea Link alone will deliver a specific reduction in household electricity bills. Any eventual savings will depend on wider electricity market conditions, network costs and the performance of the upgraded system.
Suffolk County Council condemns approval
Suffolk County Council said it was deeply disappointed that the Government had approved the development despite sustained local objections. The authority maintained its opposition throughout the examination process and submitted evidence concerning the effects on residents, transport infrastructure and the environment.
Councillor Tristan Gale, the council's Cabinet Member for Planning, Devolution and the Fire Service, said the authority believed significant concerns had not been adequately addressed. The council raised objections about construction traffic, access arrangements, environmental effects and the cumulative impact of multiple major energy infrastructure schemes in Suffolk.
These are the council's stated objections; the grant of development consent means the Government has nevertheless concluded that the project can proceed under the applicable planning framework.
Residents face years of construction activity
The project will involve substantial construction work at both ends of the proposed cable route. In Suffolk, the infrastructure includes a converter station near the proposed Friston substation, together with underground connections and associated works.
National Grid expects construction to begin in early 2027, subject to detailed planning, with completion targeted for 2031. Local residents and businesses could face disruption from construction traffic, roadworks, site access and other activities.
Suffolk County Council says it will continue working with National Grid to ensure the company meets commitments on mitigation and environmental protection. The authority has also called for a more coordinated approach to major energy developments affecting the county.
Planning Inspectorate confirms examination process
The Planning Inspectorate confirmed that the Sea Link application was submitted in March 2025 and accepted for examination the following month. A six-month examination allowed local authorities, residents, statutory consultees and other interested parties to submit evidence.
The examining authority made its recommendation to the Secretary of State on 30 July 2026. Development consent was granted on 30 October. The Inspectorate says the examination considered the evidence and views submitted by affected communities.
The approval is therefore a formal planning decision, rather than the announcement of a consultation or an agreement in principle.
More than £2 million earmarked for local community funds
The Government says National Grid will provide community funding worth more than £1 million each for Suffolk and Kent. National Grid has identified community funds of approximately £1.06 million for each county.
The money could support local facilities, green spaces, skills development and other community priorities. It is separate from the environmental mitigation measures and planning obligations associated with construction. The availability of community funding does not remove the objections raised by Suffolk County Council.
Cable manufacturing to support British industry
National Grid has confirmed that the project's subsea cable will be manufactured in Scotland at Sumitomo Electric's new £350 million factory at the Port of Nigg. The company says the facility will directly support more than 200 skilled jobs, with further opportunities across the UK supply chain.
Siemens Energy has been appointed to construct the converter stations in Suffolk and Kent. National Grid says these contracts will contribute to engineering expertise, manufacturing capacity and skills development within Britain.
The employment figures associated with the Scottish factory should not be treated as jobs created exclusively by Sea Link, as the facility will support wider industrial activity.
What happens next?
National Grid will now examine the detailed requirements attached to development consent and continue preparations for construction. The company will work with local authorities and other stakeholders on traffic management, environmental safeguards and construction arrangements.
Work is expected to begin in early 2027, with the connection targeted for completion in 2031. For the Government, Sea Link forms part of a wider programme to expand electricity transmission capacity and support lower-carbon energy.
For local communities, the focus will be on how construction is managed and whether commitments made during the planning process are delivered. The approval settles the principal development consent decision, but the project's local impacts, costs and eventual contribution to the electricity system will remain subjects of scrutiny.