The UK plans to open new seabed for up to 4GW of floating wind off southwest England and Wales, said the Crown Estate as it published details of proposals to lease areas of the Celtic Sea for enough capacity to power four million homes.

Britain's seabed landlord could by the end of 2023 award rights to spur a mixture of smaller-scale developments in the 300-350MW range and larger projects of up to 1GW.

The first projects would likely be built by 2030 and into the first part of the next decade, said the Crown Estate, which for the rest of this year and into 2022 will hold discussions with the industry and other stakeholders over its tender proposals.