Deep Green for Holyhead Deep

Tue, 02 May 2017

Natural Resources Wales has given consent is for a 0.5 MW Deep Green tidal generating device to be installed in the southern corner of the Holyhead Deep in the UK’s Irish Sea. This will be the first time that the Swedish Deep Green underwater kite technology will be tested on a full size unit at sea and it is planned that this trial unit will demonstrate and prove the technology ahead of plans for installing a 10 MW array at the site.

The installation site is located 6.5 km off the coast of Anglesey and has been carefully selected to maintain separation from the busy shipping lanes in the area and to minimize the impact on other sea users. The Xodus Group delivered the Environmental Impact Assessment (EIA) and license application on behalf of Minesto, the company and this led to the consent being given by Natural Resources Wales.

The first phase of the project will include a single Deep Green device unit, the seabed foundation that will act as the mooring for the unit and a surface moored buoy, with installation planned this year. The in-depth EIA carried out by Xodus considered the potential impacts acts on fisheries, marine mammals, sea birds, marine archaeology and cultural heritage as well as shipping and navigation, which were concluded to be ‘not significant’.

Holyhead Deep marks the starting point of the industrialisation of the Deep Green technology and it is the first low-velocity tidal energy project in the world. Holyhead Deep matches all the site requirements by providing low-flow tidal velocities with 1.5 to 2 metres per second mean peak flow at a depth of 80 to 100 metres. Following successful deployment and testing of the first installed power plant, it is planned that more Deep Green devices will be installed to form a tidal energy array.

The Deep Green system uses a buoyant wing type structure with a turbine nacelle suspended below it. Moored by a single cable, the wing swings in the tidal flow thus effectively speeding up the flow of water past the turbine fitted in the front of the nacelle. This is connected directly to the generator with the power being taken ashore via a cable that is incorporated into the mooring system.

Minesto holds an Agreement for Lease from the Crown Estate for a 10MW installation. In February, Minesto announced its intentions of scaling up the commercial roll-out of its Deep Green technology in Wales. Xodus is supporting Minesto on a scoping report for the potential development of an 80 MW site which would include up to 160 devices installed in phases in the Holyhead Deep.

Source: Dag Pike

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