Procurement of several important Deep Green subsystems finalised
As we continue the process of developing and building our first Deep Green demonstrator in commercial scale, continuous progress in procurement of important subsystems is being made. Several such processes were completed in December.
The tether rope is the cord which anchors the wing of the Deep Green power plant to the bottom joint at the seabed foundation. Considering the movement, speed and design of Deep Green, the tether rope needs to withstand heavy loads on a low diameter. Minesto has chosen a rope from Dutch company FibreMax, made of a high-tech fibre called Dyneema. Dyneema ropes are as strong as steel-wire ropes on the same diameter, but offer significantly lower weight. They are commonly used in the offshore industry, for example to moor oil rigs.
The fairing is the outer casing of the tether, enclosing the tether rope as well as cables for communication and power transmission. The fairing is made of polyurethane and has a unique, hydrodynamic design to minimise drag. To be able to control the tether when the power plant is inactive, the lower part of the fairing will be buoyant. We have chosen UK-based Subsea Energy Solutions as supplier of the fairing.
For the first 0.5MW Deep Green demonstrator that will be installed in Holyhead Deep, we will use a micro grid system (MGS) buoy. The MGS buoy will contain a transformer and all other things related to the production, and disposal, of electricity generated by the Deep Green demonstrator. The buoy also acts as the point of communication between the offshore site and onshore operations. The MGS buoy will be manufactured by marine energy company Malin Group in Scotland.
We have also placed an order with Swedish Motala Verkstad Group for the rear nacelle. The nacelle is the “body” of Deep Green and the rear part holds the hydraulic system and the rudders. The front part of the nacelle will be delivered along with the turbine which Schottel is developing.