Boskalis has brought the world's largest subsea rock installation vessel into service, doubling its capacity in the offshore wind support market and enabling fewer port calls for large-scale projects, according to Splash247.
The Dutch marine contractor's new vessel, Windpiper, will serve the growing demand for subsea rock installation as offshore wind farms move into deeper waters and harsher environments. The vessel was first announced in January 2025, with Boskalis stating that the addition would effectively double its subsea rock installation capacity and make it the largest player in the niche, Splash247 reported.
Vessel Specifications and Capabilities
The Windpiper has a rock-carrying capacity of 45,500 tonnes, making it the largest subsea rock installation ship in the industry. Key specifications include:
| Specification | Value |
|---|---|
| Length | 227 m |
| Beam | 40 m |
| Dynamic positioning | DP2 |
| Installed power | >31,000 kW |
| Thrusters | 7 |
| Rock-carrying capacity | 45,500 tonnes |
The vessel was developed by converting an existing newbuild under Boskalis' supervision. It is equipped with a moonpool for fallpipe rock installation and an inclined fallpipe system, allowing precise placement of rock on and around subsea structures, Splash247 noted.
Operational Impact on Offshore Wind Projects
Subsea rock installation has become increasingly critical as offshore wind farms expand into deeper waters, harsher environments, and more complex seabed conditions. Larger projects require vessels capable of carrying more material, reducing port calls, and installing protection with greater accuracy. The Windpiper directly addresses these needs by offering significantly higher capacity per voyage.
- Scour protection: Rock placement around turbine foundations to prevent erosion
- Cable protection: Burial and shielding of subsea power cables
- Seabed infrastructure: Stabilisation of pipelines and other structures
The vessel's 45,500-tonne capacity means fewer trips to load rock, reducing project timelines and logistics complexity for offshore wind developers and their contractors.
Implications for Shippers and Operators
For offshore wind project developers and marine contractors, the Windpiper's entry into service increases available capacity in a specialised market that has faced vessel scarcity. According to Splash247, Boskalis now holds the largest share in subsea rock installation after this capacity doubling. Operators can expect:
- Reduced scheduling bottlenecks for large wind farm installations
- Potential cost savings from fewer port calls and faster installation
- Greater reliability in project timelines due to vessel availability
However, the vessel is a niche asset and will primarily benefit large-scale offshore wind projects rather than general freight operations.
Watch List
- Offshore wind project pipeline: As more projects in deeper waters are approved, demand for the Windpiper and similar vessels may increase.
- Competitor responses: Other marine contractors may order or convert vessels to compete in the subsea rock installation segment.
- Utilisation rates: How Boskalis schedules the Windpiper across global projects will influence market pricing for rock installation services.
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