The National Grid Electricity System Operator(ESO) for Great Britain unveiled its strategic design to connect up to 4.5 gigawatts of floating offshore wind renewable energy capacity in a published report titled Beyond 2030: Celtic Sea.
According to the press release, the proposed network’s green power can power up to 4 million households.
The design proposed by the ESO connects up to 3 gigawatts into two locations in South Wales and up to 1.5 gigawatts in the South West of England.
Each of the three proposed offshore wind farms, referred to as Project Development Areas (PDAs), will have its own dedicated link to the onshore electricity network.
The plan includes one high-voltage direct current (HVDC) connection to a new potential South Wales Connection Node and two high-voltage alternating current (HVAC) connections to Carmarthenshire and North Devon.
A thorough evaluation of shortlisted designers was made based on four key objectives: impact on local communities and the environment, cost to consumers, deliverability, and operability. This comprehensive assessment enabled the ESO to select a recommended design that effectively balances these factors.
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The recommendation demonstrates a lower impact on the environment and local communities compared to other designs evaluated during the process, and it does not propose any new overhead lines for connecting the offshore wind farms.
The proposals also effectively utilize the existing transmission infrastructure more efficiently than other options.
This alignment with existing infrastructure requirements could facilitate a more coordinated approach to the placement of new substations.
The proposals support The Crown Estate’s Celtic Sea Floating Offshore Wind Leasing Round 5, a major initiative to generate 4.5 GW of floating offshore wind power, one of the largest projects of its kind globally.
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Unlike previous ESO network design efforts, the Celtic Sea project involves areas where developers have not yet submitted bids. This allows for more informed and lower-risk proposals based on network recommendations.
This approach will streamline the connection process once seabed lease agreements are awarded.
This assessment builds on the ESO’s Holistic Network Design (HND) publications, which outline plans to support up to 86 GW of offshore wind capacity through the 2030s.