Offshore Wind
Renewable Energy Installations, Engineered for Intertidal and Shallow Water Challenges
OCS brings deep marine construction experience into the renewable energy sector, offering turnkey solutions for offshore wind developments in some of the most demanding marine environments. We provide clients with an integrated service spanning concept design, construction engineering, equipment planning, barge rig-up, and full offshore execution.
Our foray into the offshore wind space began with the Tra Vinh Offshore Wind Project in the Mekong River Delta, Vietnam. Appointed by Vestas, OCS served as the lead contractor for the installation of wind towers in intertidal waters ranging from v2 to 6.5 metres in depth. This project showcased OCS’s strength in adapting oil & gas marine methodologies to the renewable energy sector.
Scope of Work & Engineering Execution
OCS’s multi-disciplinary team managed the entire offshore construction lifecycle, including:
- Concept Engineering & Crane Selection: A thorough lift study concluded that a single boom crane with a 126m boom length was optimal due to both lifting and transport constraints. The heaviest lift was the nacelle and hub assembly, weighing 170 metric tonnes, lifted to 110 metres above sea level.
- Barge Selection & Rig-Up: OCS selected and engineered the Crowley HDB 402 barge (400ft x 120ft x 25ft) for this intertidal zone. The barge was chosen for its unique combination of:
- High freeboard to accommodate water depths up to 6.5m
- Capability to ground safely when required
- Ballastable design with side sea chests to aid grounding
- Sufficient deck space and stability for long boom crane operations
- Mooring System: OCS designed, procured, and installed a robust 8-point mooring system tailored for the dynamic and tidal conditions of the Mekong Delta.
Support Vessel: Multicat "Miss Bee"
Complementing the barge was OCS’s very own shallow-draft Multicat Support Tug, Miss Bee, capable of performing anchor handling operations in water depths as low as 2.5 metres. This significantly reduced tide-related delays and enhanced barge positioning flexibility throughout the installation campaign.
OCS continues to support offshore wind projects across Asia, offering bespoke marine engineering and installation solutions. Our experience working in intertidal zones, with heavy lifts, in difficult weather and seabed conditions, makes us a trusted partner in the clean energy transition.
Looking to power your next offshore wind installation?
Contact OCS to discuss tailored, constructible solutions for renewable energy projects.
