Minesto are developing their Deep Green project off Anglesey with a 10MW array

Marine Power Systems


Developing the WaveSub, a second generation device designed to address the challenges of extracting wave energy.

Nova Innovation


Nova is developing a 1MW array at Ynys Enlli, building on the success of deploying the world’s first commercial tidal array in Shetland in 2016

Tidal Lagoon Swansea Bay


Tidal Lagoon Power are developing the world’s first, man-made, energy-generating lagoon in Swansea Bay


Deep Green produces electricity by a unique principle illustrated in the figure on the right. The water current creates a hydrodynamic lift force on the wing which pushes the kite forward. The kite is steered in an 8-shaped trajectory by a rudder and reaches a speed ten times the water current speed. As the kite moves, water flows through the turbine and electricity is produced in the gearless generator. The electricity is transmitted through a cable in the tether attached to the wing. The electricity continues in sub-sea cables on the seabed to the shore.

The benefits of the Minesto design include:

  • Site characteristics monopoly Deep Green is the only known power plant that cost-effectively produces electricity at sites with velocities between 1.2-2.5 m/s and depths between 60-120 meters.
  • High Efficiency Due to the unique characteristic of increasing the relative flow Deep Green is the most cost effective power plant on the market today.
  • Small in size and lightweight The plant weighs only seven tonnes which is 10-25 times less per MW than competing technologies which are designed for tidal flows above 2.4m/s.
  • Low-cost offshore operations Small boats and equipment are used for installation, service and maintenance. The offshore operations are minimised since only attachment and detachment has to done offshore.
  • Efficient manufacturing Size, weight and modularity of Deep Green offers the possibility of lean manufacturing
  • Utilisation of ocean currents The ability to be efficient at low velocities makes Minesto´s Deep Green the only technology to be cost-efficient in both tidal and ocean currents.
  • Predictable electricity production Tides are generated by the relative motion of the Earth, Sun and Moon, which can be calculated with almost 100% accuracy. Ocean currents are nearly constant
  • Minimal visual and environment impact Deep Green operates completely submerged at least 15 meter below the water surface

Site selection

The Crown Estate, manager of the UK seabed, has awarded an ‘Agreement for Lease’ for a commercial demonstration site for electricity production from tidal currents to marine energy company Minesto.  Minesto will prepare consent application for the site near Holyhead Island in Wales prior to the construction of a 10MW marine energy array in 2016, which will supply electricity to approximately 8,000 households.

Minesto will now further develop the project, which includes in depth environmental studies, detailed seabed mapping, cable routing and commercial activities. The Holyhead Deep site is located approximately seven kilometres from the shore where the water depth is 80-90 meters. The tidal currents are 1.5-2.5m/s. The area has been carefully selected to maintain separation from shipping lanes and to minimise the impact on other sea users.