Background
The next generation of Offshore Wind Turbine Generators (WTGs), with capacities ranging from 20 to 30 MW, is expected to become widely available between 2029 and 2030.
These turbines will be installed in water depths of 30 to 60 meters, with estimates suggesting that 80% will be supported by monopile foundations world wide.
These larger WTG units will require next-generation XXXXL monopiles with dimensions and weights reaching 100 to 130 meters in length, 12 to 15 meters in outer diameter, and weights of up to 3,000 to 5,000 metric tons.
However, many existing wind farm installation vessels are unable to safely perform the transportation and installation (T&I) of XXXL monopiles exceeding 3,000 metric tons. While new and larger crane vessels are needed for offshore installation, vessel contractors and owners are hesitant due to the risk of these expensive assets becoming obsolete before they can generate returns. Therefore, future-proof designs capable of handling monopiles up to 5,000 metric tons are essential.
Current solutions involve building larger monohull installation vessels with single crane units, but these face significant technical and operational limitations in safely handling XXXL monopiles. These monopiles require additional support points during transport, lifting, and installation, further complicating the process. Additionally, the cost of these monohull vessels, including mission equipment, is approaching $600-$800 million USD.
In contrast, our simplified vessel design, combined with a fast-track construction approach, offers a cost-efficient alternative. Our solution is at least 40-50% more cost-effective than new monohull crane vessels and operates at significantly lower OPEX. This design enables vessel owners to build multiple vessels in series to meet global demand for the CAPEX of one single Monohull Vessel.
Key Cost-Saving Factors for a Positive Business Case:
- No need for heave-compensated pile grippers.
- No need for up-ending tools.
- No need for lifting spreader beams.
- No need for additional monopile support cradles and sea fastening.
- No need for onshore or offshore cranes.
- Significantly lower CAPEX (approximately 40% reduction) and OPEX (approximately 25% reduction).
- Reduced onshore logistics costs due to the vessel’s unique roll-on system, no need for SPMT units.
- Simplified load-out process in floating condition with legs up, saving time and improving workability.
Our innovative approach ensures a future-proof, cost-efficient solution for the installation of next-generation XXXL monopiles, addressing the challenges of the evolving offshore wind industry.