In 2012, Glosten was selected by the Energy Technologies Institute to design an offshore wind floating platform system demonstrator. The goal of the project was to accelerate the market introduction of floating foundations for deep water offshore wind farms and to break down technical barriers for deployment. The result is a front end engineering level design of the PelaStar floating foundation supporting an existing full scale 6 MW wind turbine. PelaStar is now ready to disrupt the offshore wind industry with a breakthrough migration into deeper water.
Install a Cost Competitive 150 m Diameter Wind Turbine Offshore
The viability of offshore floating wind is based on demonstrating the lowest cost of energy of all conventional low-carbon power sources. This will be possible by reaching better wind resources with larger more powerful and efficient turbines, but also by incorporating lower cost foundations and reducing balance-of-plant costs. These costs are controlled by providing a floating foundation that maximizes turbine availability by minimizing turbine wear due to vessel motions. The system must also minimize maintenance costs by avoiding expensive interventions with large service vessels commanding dayrates exceeding $200,000.
PelaStar Tension Leg Platform
Glosten completed a FEED level design of the PelaStar tension leg platform to support an Alstom 6 MW Haliade 150 turbine. The Glosten-Alstom team worked closely to model the vessel motion interactions with the turbine and design a capable foundation. Teams of top-tier subcontractors were contracted to develop hull construction, anchor installation, tendon manufacture, site installation and operations, and maintenance plans. A full cost of energy study was also prepared that applied the detailed demonstrator project cost data to predict the future cost of energy of floating wind farms over a wide range of UK offshore sites.
Affordable Deep Water Wind is in Our Future
The final design was delivered in February of 2014, and results show that UK offshore wind energy costs could fall to below £85/MWh by the mid-2020s, with further reductions possible as this technology matures. The PelaStar 6 MW demonstrator has been designed for installation in the Celtic Sea off Cornwall. The designed structure reaches 180 m from blade tip to waterline and will operate continuously in the harsh conditions of the North Atlantic. Rock anchor systems, tendons and connectors, hull fabrication and transport, assembly, installation and operations have all been designed, planned, and costs estimated for the construction phase.
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