Nautilus Interconnector
UPDATE November 2024
In great surprise news, reversing Ofgem’s previous decision (below) of March 2024, it was announced on 12 November by National Grid’s Ben Wilson, President of National Grid Ventures that if Nautilus proceeds, it will connect at the Isle of Grain, Kent after all. This followed on from Ofgem’s announcement that it had approved the Initial Project Assessment for the Nautilus interconnector (Offshore Hybrid Asset) to connect at Isle of Grain, Kent.
READ the full story in our Blog HERE
UPDATE August 2024
In March 2024, the regulator Ofgem rejected National Grid’s proposal to move the Nautilus Interconnector connection to the Isle of Grain, due to high network upgrade costs. As a result, Ofgem has reverted to the original plan for the connection to be at Friston and launched a public consultation, which closed on 15 August 2024. SEAS submitted a formal objection as part of this consultation (Read SEAS Response HERE). The decision was expected in Autumn 2024.
THE BACKGROUND STORY
The recently published proposals by National Grid Ventures (NGV) concerning Nautilus Interconnector (to connect up to 1.4 GW of offshore wind in the UK to Belgium) combined with the planning applications for ScottishPower Renewables (SPR) East Anglia One North (EA1N) and East Anglia Two (EA2) offshore wind projects reveal the hard evidence that Suffolk Coast and Heaths is in grave danger of mass industrialisation. The onshore devastation can be seen all too clearly on the map above which shows kilometres of additional cable corridors gouging through our protected landscapes and a further converter station looming 24 metres high and concreting over an additional 12 acres of greenbelt land. This could impact on additional communities including Theberton, Kelsale, Leiston, Sternfield, Snape and Saxmundham. (To be clear, SEAS are not in favour of any of the onshore routing and converter siting options that have been presented by NGV. If NGV is truly committed to protecting rural coastal communities then they must bring forward a grid connection on a brownfield site.)
National Grid Ventures has finally published an interim Consultation Summary following their engagement with the community and local authorities in the consultations of October 2021 Nautilus Interconnector, Non-Statutory Consultation Feedback Summary, June 2022
THE LARGEST COMPLEX OF ENERGY INFRASTRUCTURE IN THE UK
The harsh reality is that this is just the beginning. There are currently eight offshore wind energy projects and interconnectors that are widely believed to be planned to connect to the National Grid substation at Friston to form an Energy Hub. With the addition of Sizewell C Nuclear Power Station, this will be the largest complex of energy infrastructure in the UK. Effectively the industrialisation of Suffolk Coast and Heaths.
NEEDLESS DESTRUCTION
It is unclear why a currently unspoilt protected rural area, rich in wildlife and with an important nature-based tourism economy (including nearby Thorpeness and Aldeburgh) was chosen over a brownfield or industrialised site.
The destruction caused to the onshore environment, local tourist economy and coastal communities is devastating. Each cable corridor will gouge a motorway sized scar 9km inland, through the fragile cliffs north of Thorpeness, across the Suffolk Coastal Path, the Suffolk Sandlings and the Suffolk Coast and Heaths Area of Outstanding Natural Beauty (AONB) to arrive at the principal substation site, the medieval rural village of Friston. This Energy Hub at Friston is being planned on a massive scale. The substations planned for SPR’s projects alone are nearly 3 times the size of Wembley Stadium.
HOLD BACK THE FLOOGATES
The foundation of this Energy Hub and the multiple cable corridors cutting through these protected landscapes are SPRs two offshore wind projects.
If we can’t stop Scottish Power’s EA1N and EA2’s application or obtain a ‘Split Decision’ it will open the flood gates, Nautilus being the first to follow on.
As you know doubt will be aware, as of March 31st 2022, these two projects have now been consented. However, we have not given up. SEAS has now issued an application for judicial review seeking that the decisions of the Secretary of State are quashed on the basis that they were taken unlawfully. This is likely to be decided by the courts later this year.
If the onshore works of EA1N/2 are reconsidered then plans for the onshore infrastructure for Nautilus will at least have to go back at the drawing board.
WRITE TO THE SECRETARY OF STATE
Ultimately, the decision as to whether to reconsider the Applications of EA1N and EA2, after judicial review, lies with the Secretary of State. It is therefore vital to make the government aware of our grave concerns. Please help and write now.

Nautilus Timeline
2020 – 2021
– Initial desktop studies and informal engagement
2021 – 2023
– Feasibility studies and consultation on siting and routing options
2021 – 2023
– Community consultation and Preliminary Environmental Information
2023
– DCO application submitted to the Planning Inspectorate
– DCO application examined by the Planning Inspectorate
2024/2025
– Decision on the DCO application provided by the Secretary of State
2025
– Final investment decision made
– Construction commences
2028
– Commercial operation begins
What SEAS Say about Nautilus
Nautilus Key Documents
Nautilus Interconnector, Non-Statutory Consultation Feedback Summary, June 2022
Nautilus Interconnector Update, National Grid Ventures, September 2021
FAQs, National Grid Ventures, September 2021
Information Sheets, National Grid Ventures, September 2021
Maps, National Grid Ventures, September 2021
Nautilus Interconnector FAQ, National Grid Ventures, May 2020
Nautilus Interconnector Briefing Pack, National Grid Ventures, July 2019
Nautilus in the Press
The Rt Hon Therese Coffey MP response to Nautilus Interconnector Public Consultation, 26 October 2021
National Grid in talks over plan for energy island in North Sea, The Guardian, 6 October 2021
New energy project could ruin precious coast and heaths, claim campaigners, East Anglian Daily times, 27 September 2021
‘Greener’ solution tabled to replace ‘destructive’ Suffolk energy plans, New Civil Engineer, 20 September 2021
National Grid Ventures has reclassified two interconnector projects off east England as Multi-Purpose Interconnectors, reNEWS.BIZ, 7 October 2020
Cumulative Impact - SEAS Submissions into the EA1N/2 Examination
- SEAS Submission Final Submission Re: Cumulative Impact, 6 October 2021
- SEAS Supplementary Submission on Cumulative Impact Deadline 13 – 5 July 2021
- Cumulative Impact, Evidence from National Grid, SEAS Deadline 11 Submission
- Cumulative Impact, SEAS Deadline 9 Submission
- Cumulative impact, SEAS Deadline 8 Submission
- Norfolk Vanguard and cumulative impact, SEAS Deadline 6 Submission
- Cumulative Impact, SEAS Deadline 5 and Deadline 1 Submission
- Cumulative Impact, SEAS Deadline 4 Submission
- Cumulative impact, SEAS Deadline 3 Submission
- Cumulative impact, SEAS Deadline 2 Submission
- NGESO and NGETS, Deadline 2 Submission
The Way Forward - A Split Decision
SEAS has called on the Examining Authorities to recommend to the Secretary of State a ‘split decision’ so that:
- The offshore turbines are recommended for consent.
- The onshore infrastructure is rejected in favour of full consideration of better locations for this infrastructure where the adverse impacts are minimised at a brownfield or industrialised site.
Campaigners call for ‘split decision’ over Suffolk windfarm projects, East Anglian Daily Times, 19 July 2021
SEAS Further submission with regard to a ‘split decision,’ A ‘Split Decision’- A Positive Way Forward, 5 July 2021
SEAS Submission to the Planning Inspectorate Re: The ‘Split Decision’ February 2021
Therese Coffey MP campaigns for a ‘Split Decision’ and to reject the Friston Substation site February 2021
The Way Forward - Offshore Integration
The benefits of an integrated offshore transmission network far outweigh any benefit gained from continuing with a radial transmission system.
Key Documents
Crossed Wires: Maintaining public support for offshore wind farms, Policy Exchange, July 2021
The Offshore Co-ordination Phase 1 Final Report, NGESO, 16 December 2020, NGESO: “Adopting an integrated approach for all offshore projects to be delivered from 2025 has the potential to save consumers approximately £6 billion, or 18% in capital and operating expenditure between now and 2050”. Importantly, footnote 5 states, “This means applying an integrated approach to all offshore projects that have not yet received consent”.
Energy White Paper, Powering our Net Zero Future, December 2020
On 6 November 2020, in response to Mr Duncan Baker’s adjournment debate, the then Energy Minister, and now the newly appointed Secretary of State for the Department of Business Energy and Industrial Strategy (BEIS), Mr Kwarteng, made a very encouraging response and said, amongst other things:
- The offshore wind industry had evolved since 2015;
- There was a shift in the industry towards integration.
- Point to point transmission was recognised as having severe detrimental impacts onshore
- Technology was available to build an offshore integrated network
- Industry was engaged through the OTNR
- The argument for some form of offshore network has been won
In July 2020 the Department of Business Energy and Industrial Strategy announced a major Review, the Offshore Transmission Network Review to address the barriers it presents to further significant development of offshore wind, with a view to achieving net zero.
The findings of the Integrated Offshore Transmission Project (East) 2015 Report concluded that an integrated offshore solution was in the interests of the UK as a whole.
It is illogical for further radial connections to the grid to be approved. The acutely detrimental impacts of radial connections must now be properly recognised in the Planning Balance.
What is a 'MOG'? Is it the answer?, SEAS, June 2020
In the Press
UK
UK National Grid in talks to build an energy island in the North Sea, New Scientist, 11 October 2021
'Money can't compensate' for disruption caused by offshore wind, campaigners say, EADT July 2021
Prime Minister says coast could be the 'Riyadh of offshore wind' in PMQs, EasternDaily Press, 24 February 20021
U.K. Power Grid Moving Offshore to Support $27 Billion Wind Boom, Bloomberg, December 2020
Outdated regulation is slowing investment in onshore electricity grid, The Guardian, 1 November 2020
Offshore Wind in UK – Roadmap Required, Offshore Wind, October 26 2020
Change the way offshore wind farms connect and save billions - report finds, Eastern Daily Press, September 20 2020
Offshore wind blows hole in case for National Grid electricity role, The Times, October 8 2020
Modular Offshore Grid (MOG) - Can these ideas stop the countryside being dug up? Eastern Daily Press, June 27 2020
Norfolk MPs lobby Kwasi Kwarteng, Energy Minister at BEIS, SASES, 11 June 2020
Greenpeace suggests taking a more 'strategic approach' to offshore wind grid infrastructure, including increasing the number of grid connections to land shared between several projects, ReNEWS.BIZ, June 4 2020
Offshore Ring Main (ORM) feasibility study announced after Norfolk MPs met with Energy Minister Kwasi Kwarteng to discuss their concerns, Eastern Daily Press, June 2 2020
NORTH SEA INTEGRATION
North Sea EU countries step up plans to harness wind power, Financial Times, 20 May 2022
Plans for Offshore Wind-to-Green Hydrogen Energy Islands in Germany and Denmark Offshorewind.biz, 20 May 2022
Denmark maps seas for future offshore wind farms and energy islands, Recharge, June 8 2020
Denmark confirms massive wind plans for 'world's first energy islands' in North Sea and Baltic , Recharge May 20 2020
Denmark eyes 10GW offshore wind 'islands' in $45bn plan, Recharge, December 2019
North Seas ministers seek rules for meshed offshore wind grid, Recharge, December 4 2019
The USA
Growing chorus’ endorses multi-user transmission system, Riviera May 2020
Multi-user US offshore grid could 'save $1bn' ReNEWS.Biz, May 2020
Report Finds $1B in Grid Upgrade Savings, Other Benefits in Planned Transmission Approach to Offshore Wind, Yahoo Finance, May 2020
Campaign With Us
We are asking you to write, to the Secretary of State for the Department of Energy Security and Net Zero (DESNZ), see full details HERE
A National Grid Converter Station under construction (Viking Interconnector). Nautilus converter station is planned to a height of up to 24 metres over a site of 12 acres. Unnecessary destruction if it doesn’t go to a brownfield site.