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HydroWing - Tidal Device

Our HydroWing tidal device is designed to tackle the challenges that have hindered the industrialisation of the tidal sector to date.

Our patent pending solution incorporates a full system approach integrating installation, operations and maintenance at the core of the design in order to reduce operating costs.

Tidal Challenges

The tidal industry has struggled to drive down its Levelized Cost of Energy since its birth over a decade ago, preventing it from becoming competitive and thriving within the open electricity market. The two main issues lie in turbines complexity and reliability and expensive offshore maintenance.

The engineering drive to optimise energy extraction has led to many developers encountering issues with device reliability. Reduced reliability results in increased down time and loss of revenue. To add to these associated costs the requirement of large and specialised vessels has incurred cripplingly high costs on developers.

Inyanga's solution

The HydroWing solution combats these issues via a holistic and simplistic approach which reduces the cost, improves reliability and time and effort of O&M.

See the device outline here:

The device has been designed to provide ease of maintenance and ensure maximised reliability with precedence over maximised capacity.

The HydroWing consists of two main components

1 x Permanent Gravity Based Structure

1 - 3  x Retrievable wings with 3-5 small turbines (100 -200kW)

This simple arrangement enables reduced CapEx and reliable power generation through:

  • Reduced cost and greater reliability of non-yawing and bi-directional turbines
  • Turbines constructed from reliable of the shelf components enabling wide supply chain and reduced lead times to be accessed
  • Multiple turbines enable maintained power production in the event of individual failure
  • Support structure constructed from standard cross sections
  • Smaller turbines (5-10m diameter), reduce wake effects enabling increased power density and revenue potential of sites
  • Small turbines distribute loads evenly through support structure prolonging fatigue life
  • Single export cable for each a single HydroWing structure

O&M Procedure

The retrievable wing arrangement creates, low weight modular generating capacity enabling significantly reduced Installation and O&M cost over device life. O&M of turbines consists of simple process:

1 - Barge vessel with simple twin davit lifting arrangement arrive at site with LARS

2 - LARS lowered down to HydroWIng using in built cameras and guidance systems

3 - LARS hydraulically engages with wing and wet mate connections released as lifted

4 - LARS and wing returned to surface for infield maintenance or return to port

The Installation and O&M procedure has been central to the HydroWing design and is a result of the years of experience performing marine operations. The procedure ensures ease of accessibility, reliability and availability of the HydroWing to bring about significant lifetime operational cost reductions through:

  • Modular design enables standard shipment of all components
  • Utilisation of low-cost barges
  • Simple, low weight lifting arrangement that can be retrofitted to hired barges
  • Maximised power availability due to rapid response times of readily available maintenance vessels
  • Staggered wings enabling unobstructed access to each wing in all configurations
  • LARS eliminating necessity for expensive and cumbersome ROV
  • All turbine electronic components accessible in single location for infield maintenance
  • Wet mate connected stab plates enabling recovery and reinstallation procedure to be complete in a single slack tide

HydroWing Ambition

With the ever growing demand for clean, reliable and low cost energy tidal energys unique predictable nature all but guarantees its place in the energy mix once a competitive Levelized Cost of Energy is realised. We are confident our innovative HydroWing device will succeed in providing this and we strive to target this source of energy and become like for like in competitiveness to offshore wind over the next decade.

We strive to achieve this through a steppingstone process learning from those tidal developers that have come before.

Stage 1 – Community Scale Projects

We aim to prove our technology at lower energy sites to provide power for small communities, such sites will configure as:

Low energy – < 3.2 m/s max velocity

Single HydroWing - ~ 0.6 MW

Number of turbines – 6 turbines (100 kW each)

This approach enables proof of the low-cost potential of the HydroWing at the reduced risk low energy sites whilst still enabling the inevitable learning that has been experienced by all large-scale developers.

Stage 2 – Commercial Array Scale

The technical and operational learning from low energy community scale projects will enable significant cost savings at higher energy sites and upscaled deployment. Following stage one we endeavour to upscale to realise further cost reductions through increased HydroWing size and economies of scale. This will be achived by increasing the number and capacity of turbines on each wing (5 x 200 kW) as well as increasing the number of wings on a single structure to 3.

Medium Energy –3.2 - 4  m/s max velocity

30MW installed capacity - ~ 15

Number of turbines – 150 turbines (200 kW each)

Stage 3 – Industrial Scale

Beyond stage 2 having driven down the LCOE and undergone significant learning we see the HydroWing being deployed at low, medium and high energy sites across the globe providing low cost, reliable and easily maintained energy to populations across the globe.