Largest offshore grout pour to date delivered at Yeu-Noirmoutier Wind Farm
Project overview
Project name
Yeu-Noirmoutier Offshore Wind Farm
Location
Bay of Biscay, France, 16.5 km offshore
Developer partners
DEME
Solution
XL Monopile grouting solution
Menck*, Acteon’s Marine Foundations business line, delivered its largest offshore grouting operation to date for DEME, supporting the installation of 61 turbine foundations at the Yeu-Noirmoutier Offshore Wind Farm.
Navigating a critical phase
To keep pace with DEME’s rapid installation schedule, we executed large annulus grouting operations at previously unmatched pumping rates, achieving exceptionally fast turnaround times between pours and enabling fast consecutive foundation installations.
Our solution
High-volume monopile grouting solution
Building on experience from the Saint-Nazaire project and leveraging new equipment innovations, we deployed our XL Monopile Grouting Package to meet Yeu-Noirmoutier’s scale and speed requirements.
The package featured two automated planetary batch mixers, auger-fed from four 125 tonne silos. With over 500 tonnes of grout stored offshore and additional Sika Grout 9650 transferred to silos during operations, continuous mixing was maintained throughout each pour. An integrated automated wash system enabled a reduction of cleaning and preparation time between operations. Strong grout installation results were achieved through a high mixing rate, innovative implementations and consistent reliability.
The solution integrated seamlessly with DEME’s MODIGA installation process, supported by jointly developed procedures and offshore service readiness. This enabled the installation of two turbine foundations within five days. The performance demonstrated Acteon’s capacity to deliver large-scale marine foundation projects reliably and efficiently.
Innovations in action
- 100 m³/hr XL Twin Pan automated batch mixing system
- Four 125-tonne grout silos (500-tonne total capacity)
- Continuous SG9650 grout transfer during pumping
- Two high-flow offshore grout pumps
- Automated mixer and hopper wash-down system
- Offshore lab with temperature-controlled sample storage
- Dedicated offshore service and maintenance workshop
The result
We delivered our largest grout pours to date with unmatched mixing speed, reliability, and operational readiness. The XL Monopile Grouting Package enabled DEME to maintain high foundation installation rates, completing two turbine foundations in just five days. The equipment sets new benchmarks for offshore grouting performance and reinforced Acteon’s position as a leader in marine foundations technology.
*originally contracted through LDD
Acteon’s performance on the Yeu-Noirmoutier Offshore Wind Farm project was outstanding. Their ability to deliver high grout volumes with exceptional reliability and speed was critical to maintaining our fast installation rate. The XL Monopile Grouting Package, jointly improved for this job based on Saint-Nazaire, is unmatched in the market and again integrated seamlessly with our MODIGA installation process. Their team's professionalism and technical expertise made a real difference, and we’re extremely pleased with the results.
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