The way we generate electricity in the UK is changing rapidly, and we are transitioning to cheaper, cleaner, and more secure forms of energy like new offshore windfarms. We need to make changes to the network of overhead lines, pylons, cables, and other infrastructure that transports electricity around the country, so that everyone has access to the clean electricity from these new renewable sources.

The Government has set a commitment to reach net zero greenhouse gas emissions by 2050 and an ambition to connect 50 GW of offshore wind by 2030 – enough energy to power every home in the country.

To achieve this, offshore wind is being developed at scale and around 60% of the current offshore wind projects will come ashore along the East Coast.

Couple this with new nuclear generation proposed at Sizewell C and greater interconnection with countries across the North Sea, we expect to see a significant increase in the level of renewable and low carbon electricity generation connecting in East Anglia.

While our existing high voltage electricity network in East Anglia has been sufficient until today, it doesn’t have the capability needed to reliably and securely transport all the energy that will be connected by 2030 while working to the required standards.

In the first half of this decade, we are investing significantly in upgrading the existing network, but that still won’t deliver the capability that is needed. We need to reinforce the region’s network and to increase the network capability to carry the clean green energy that is proposed.

We are proposing to build approximately 183 km of new electricity transmission reinforcement between Norwich and Tilbury. This will be made up mostly of overhead line and pylons, along with some underground cables and a new 400 kV substation. Our proposals are part of The Great Grid Upgrade – the largest overhaul of the grid in generations.

Norwich to Tilbury will play a vital role in delivering electricity efficiently, reliably, and safely and will support the UK’s move to reduce carbon emissions.

We are committed to working with local communities as we develop our plans. We want local residents to have the opportunity to access the new jobs, business opportunities and positive biodiversity and environmental improvements that The Great Grid Upgrade can deliver.

We have changed the name of the project from East Anglia Green Energy Enablement (GREEN) to Norwich to Tilbury as part of The Great Grid Upgrade. All our projects that are part of The Great Grid Upgrade will include specific locations in their names to make it easy for people to understand what and where we are proposing to build new grid infrastructure. 

The name of our project may have changed but our focus remains the same – to bring new sources of renewable energy to homes and businesses across East Anglia and the UK. 

Norwich to Tilbury is a key part of our wider investment programme to upgrade our electricity transmission network in East Anglia to ensure we meet this future energy transmission demand.

More information

About Norwich to Tilbury

What we know so far and why the project is needed.

How we develop projects

Learn more about how National Grid develops projects

Information for landowners

Read information for landowners and persons with an interest in land related to the project.

Public consultation

Learn more about our second stage of consultation and view an interactive map of our proposals


View our development programme and next steps.

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Document library

View all documentation and materials for Norwich to Tilbury.

Frequently asked questions

Find answers to the frequently asked questions.

Contact us

Get in touch with our Community Relations team.