Sea Link is a proposed new 2 gigawatt (GW) subsea high voltage direct current (HVDC) electricity connection, approximately 140 km in length and predominately offshore. This includes HVDC converter stations and high voltage alternating current (HVAC) connections onto the national electricity transmission system.
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 the use of renewable energy generation, to upgrading the existing transmission network to allow communities across the country to benefit from this clean energy.
By building Sea Link, we will increase the network’s capacity to manage new energy transmission in and out of Kent and Suffolk to meet local and national energy demands.
The majority of Sea Link will be offshore HVDC subsea cables, with onshore infrastructure at either end connecting it to the transmission network. The exact route of the line will be informed by onshore and marine surveys plus feedback from our non-statutory consultation, which took place between October and December 2022.
We will use the feedback received from our non-statutory consultation, and the results of further technical assessments and surveys to refine our proposals. We will present and seek feedback on our updated proposals during our statutory consultation in 2023.
Power is generated and consumed in all regions of the UK, however, some regions generate more or consume less than others, and surplus electricity is shared across the country. In addition, surplus power is traded with our European neighbours through electricity interconnectors. Reliance on interconnectors will increase as a means of balancing the peaks and troughs in our domestic electricity generation, as a growing amount will be intermittent due to it being increasingly weather dependent. For example when wind generation is high, surplus power will be exported, and when wind generation is low, some of our needs will have to be met by importing power.
To learn more about our proposals that we consulted on during our non-statutory consultation, you can watch a recorded presentation by the project team on each of the three topics:
Our proposals in Suffolk
Marine route proposals
Our proposals in Kent
Sea Link includes:
- Two HVDC converter stations, one in Kent and one in Suffolk
- Approximately 140 km of underground and subsea electricity cables between these two stations
- An underground cable connection to the proposed Friston substation in Suffolk
- An underground cable or overhead line connection to the existing Richborough to Canterbury overhead line in Kent