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.
Glosten completed the front-end engineering and design (FEED) 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.
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.