X1 Wind completes assembly for ‘downwind’ floating turbine

4C Offshore | Tom Russell
By: 13/10/2021 X1 Wind
X1 Wind has completed the rotor assembly for its floating wind platform. The firm’s X30 prototype is now fully assembled in Las Palmas, Gran Canaria, ready for installation at the PLOCAN test site.

The tripod-like platform features a lightweight and scalable design, aimed at minimising environmental impact on the ocean. Fitted with a specially adapted V29 Vestas turbine, the unique downwind system is designed to weathervane and orientate passively with the wind to maximise energy yields.

Construction of the X30 Platform was completed last November by DEGIMA in Santander, before being shipped in different segments to Gran Canaria. Structural assembly was managed entirely onshore at Hidramar Shipyard, Las Palmas, using LTM mobile cranes and local equipment.

“We are thrilled to complete this latest milestone as we move towards deployment,”
said X1 Wind CEO Alex Raventos. “The rotor assembly represents a symbolic moment in this project, fitting the blades which will ultimately harness the wind and demonstrate our downwind design. Strong summer trade winds in Gran Canaria brought minor delays after the initial load-out, but this exciting period brings the assembly process to fruition. In the coming weeks, we will engage in cable and anchor installations before the platform is stationed at a 50m water depth for final commissioning. From the outset, X1 Wind has been committed to find a more efficient structural approach for floating wind compared to more traditional systems. We believe we have now developed the technology to take full advantage of the marine environment, while respecting the future sustainability of the ocean. Our system will drive greater structural efficiency, reducing loads, especially the bending moments at the base of the tower, allowing for a lighter design.”

“With 100m plus blades becoming more prevalent in offshore environments, significant measures are needed to avoid tower strikes,”
said co-founder Carlos Casanovas. “This typically involves increasing the distance between the blades and tower applying a tilt and cone angle, and designing more costly pre-bent and stiffer blades, which also makes them heavier. However, these measures come with increased manufacturing complexity, cost and potential loss of power generation. Using a downwind configuration reduces the risk of tower strikes, opening up the possibility of using lighter, more flexible and therefore cheaper large-scale wind turbine designs. These are key characteristics which will enable the development of future ‘extreme-scale’ downwind structures with research already being conducted on 200m blades and 50MW power ratings.”

X1 Wind’s X30 deployment is being delivered in conjunction with the PivotBuoy Project backed by a pan-European consortium including EDP NEW, DNV, INTECSEA, ESM and DEGIMA and research centres WavEC, DTU and PLOCAN. Supported by €4 million from the European Commission H2020 Program, PivotBuoy aims to reduce the current Levelized Cost Of Electricity (LCOE) of floating wind.