Plans for the United Kingdom’s first floating hydrogen production facility are moving forward in the Celtic Sea under the Milford Haven: Hydrogen Kingdom (MH:HK) project. The initiative will demonstrate offshore hydrogen generation using a combination of wind power and electrolysis to produce renewable fuel.

The MH:HK project is being delivered by a consortium of organisations committed to advancing clean energy in the Celtic Sea region. The partners include Celtic Sea Power, Dolphyn Hydrogen, Offshore Renewable Energy (ORE) Catapult, and Wales & West Utilities. Together, they have progressed both the technical design and consenting pathway, bringing the demonstrator significantly closer to construction at the Pembrokeshire Demonstration Zone (PDZ), a 90 km² offshore test area leased from The Crown Estate and managed by Celtic Sea Power as part of the Pembroke Dock Marine programme.

The demonstrator phase of MH:HK is expected to deploy a 10–15 MW floating hydrogen facility, with plans to scale up to over 135 MW. Once operational at full scale, the project could produce more than 10,000 tonnes of hydrogen annually, supporting the decarbonisation of key industrial clusters and transport hubs across South Wales.

“Milford Haven: Hydrogen Kingdom helps further lay the foundations for a large-scale, low-carbon hydrogen economy in Wales,” said Brad Davies, Survey and Consents Manager at Celtic Sea Power. “A key element of this pioneer project was to establish a consenting pathway that involved engagement with regulators and a wide range of stakeholders. CSP were delighted to play a role here to help strengthen the case for investment in South Wales’s clean energy future.”

The project directly supports UK Government hydrogen production targets, provides certainty for national pipeline initiatives such as Project Union and HyLine Cymru, and aligns with the ambitions of the Milford Haven Future Energy Cluster and Celtic Freeport.

By advancing Dolphyn Hydrogen technology, developing new consenting processes for faster deployment, and exploring wave energy co-location with hydrogen at the PDZ, MH:HK represents an integrated approach linking offshore generation with onshore hydrogen distribution.

The project is supported by Innovate UK through the Launchpad: Net Zero Industry South West Wales programme, alongside co-funding from the Swansea Bay City Deal’s Pembroke Dock Marine initiative.