TS-FLOW™ – JIP – Celtic Sea

Celtic Sea – Temporary Storage, Floating Offshore Wind


The wet storage challenge was thought to be most acute in the Celtic Sea area (due to the limited number of sheltered bays and estuaries) and hence the Celtic Sea was the first area of focus for the first iteration of the TS-FLOW™ JIP.

Focussed on supporting the upcoming Celtic Sea licencing round and project delivery, the JIP is supported by The Crown Estate. 5 developers participated in the JIP, with a further 2 signing-up following completion of Phase 1. As the licensing round heats up then more developers are expressing an interest to participate in future phases.

It is expected that developers plans and details for temporary storage must form an integral part of their project execution plan that is presented with their licence application.

Phase 1 of the JIP commenced mid 2022 with completion and delivery of the results to participants in December 2022. The detailed results are confidential to the participants (find out how to obtain the result by contacting OSG), however the key learnings and outcomes are discussed in the Celtic Sea JIP Whitepaper.

Phase 2 will be commencing in Q3 2023.


The Celtic Sea JIP focusses on supporting Celtic Sea developments, with the search area indicated below. The area investigated extended from Southampton in the south of England, up to Ayr in Scotland and included the East cost of Northern Ireland and Ireland.

The temporary storage locations could also support FLOW developments in the Irish Sea and Southern Ireland.