About East Anglia GREEN

East Anglia GREEN is a proposal by National Grid Electricity Transmission (National Grid) to reinforce the high voltage power network in East Anglia between the existing substations at Norwich Main in Norfolk, Bramford in Suffolk and Tilbury in Essex, as well as connect new offshore wind generation. 

The UK Government has indicated its ambition to achieve net zero emissions by 2050. This means achieving a balance between the greenhouse gases put into the atmosphere and those taken out. The energy industry plays a key part in this transition, from developing renewable energy generation technology, to upgrading the existing transmission network to allow communities across the country to benefit from this clean energy.

The East Anglia Green Energy Enablement project (East Anglia GREEN) will support the UK’s net zero target through the connection in East Anglia of new low carbon energy generation, and by reinforcing the local transmission network.

Our proposals include building a new 400,000 volts (400 kV) electricity overhead transmission line, work at existing substations and building a new substation to connect new proposed offshore wind farms to the electricity transmission network.

What works are proposed for East Anglia GREEN?

The network reinforcement that East Anglia GREEN will provide would be achieved by the construction and operation of a new 400 kV electricity transmission line over a distance of approximately 180km and a new 400 kV connection substation.

The reinforcement would comprise mostly overhead line (including pylons and conductors – the ‘line’ part) and underground cabling through the Dedham Vale Area of Outstanding Natural Beauty (AONB) and a new 400 kV connection substation in the Tendring district.

The new substation site would be fenced and would contain high voltage electrical equipment, such as transformers, circuit breakers and shunt reactors, support structures, control buildings, a permanent access road and parking areas.

Works would be required at the existing 400 kV substations at Norwich, Bramford and Tilbury. Cable sealing end (CSE) compounds would be required to connect sections of underground cable with the overhead lines. Each CSE compound would be fenced, and contain electrical equipment, support structures, a small control building and a permanent access track.

Project Timeline

The indicative timeline below details our anticipated development programme, including when we will consult on our proposals and when you will be able to share your views.

What if?

What if there was enough green energy for everyone?  What if we became clean energy pioneers? What if you could play a part in the UK’s green recovery?     

Visit National Grid’s digital hub to find out more about why these critical updates need to happen. 

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