Deep Green Project: Installation Operations, August 2019

Mariners are advised that Minesto UK Ltd will be carrying out installation operations for their “Deep Green” tidal energy converter in the Holyhead Deep off the coast of Anglesey, North Wales, in August 2019.  Details of the operations are provided in a Notice to Mariners that can be downloaded here and which is summarised below.

Holyhead Deep Project

Holyhead Deep is the starting point for developing Minesto’s unique “Deep Green” marine technology at a commercial scale.  It will be the first low-velocity tidal energy project in the world.

The development of tidal energy production at Holyhead Deep is due to be done in phases.  The first step was the installation of one 0.5MW “Deep Green” demonstrator during 2018.  Following deployment and testing, the ambition is to install further Deep Green devices to a commercial demonstration array of up to 10MW installed capacity.

Further information about Minesto, the “Deep Green” technology and Holyhead Deep can be found on the Minesto website here.

Installation Operations, August 2019

The installation of a Deep Green DG500 tidal energy converter is due to take place approximately 6km west of South Stack off the coast of Anglesey in the Holyhead Deep.


The installation is due to take place during on the 5th August 2019.  Installation work will be weather dependent.  The expected duration of works will be 7 days.

Details of the work is provided in the Notice to Mariners which can be downloaded here.

Operations & Location

The installation operations in August will consist of the following operations:-

  • Mooring of a Micro Grid System (MGS) Buoy, MGS 1, Special Purpose Light Buoy, Fl(4)Y.15s to the Pre-laid anchor spread.
  • Laying of the Power Transfer Fastening (PTF) Assembly (Umbilical) along the sea floor.
  • Connecting the Kite System (consisting of the Kite, Tether, Bottom Joint Connector) to the pre-laid Gravity Base Structure (GBS) Foundation.

The location of these components is listed here:-

  • MGS Offshore Support Buoy: 53° 17.7957′ N 004° 47.7582’W
  • Gravity Base Structure: 53° 17.8309’N 004° 47.9558’W

The location is shown in a map in the Notice to Mariners which can be downloaded here.

A safety zone of 500m on the sea surface will be established on the MGS Offshore Support Buoy.  The moorings for this buoy will extend 800m from the buoy on the seabed.


The installation work will involve the vessels listed below.  A link to the Marine Traffic website is provided to provide more details about each vessel and also details about their current location.

A wide berth is requested at all times as the vessels may be restricted in the ability to manoeuvre.

Please contact Jim Andrews, Fishery Liaison Officer by e-mail or phone (+44(0)7908-225865) if you have any queries or concerns about this notice.

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