Offshore Wind Jacket Foundation Fabrication: Global Supply Chain Overview
Steel jacket foundations are the preferred substructure for offshore wind turbines in water depths of 30–60 meters, where monopiles become uneconomical or technically infeasible. With 145 jackets installed globally in 2025 alone and the pipeline expanding rapidly across Europe, Asia-Pacific, and the US East Coast, procurement managers face a tightening fabrication bottleneck.
Market Landscape
The jacket fabrication supply chain is concentrated among roughly 30–40 active yards worldwide, though the number of qualified suppliers is expanding as demand grows. Key fabrication hubs include:
| Region | Key Yards | Strengths |
|---|---|---|
| Western Europe | Smulders (Belgium/NL), Harland and Wolff (UK), CRIST (Poland) | Proximity to North Sea projects, established logistics |
| Southern Europe | Navantia Seanergies (Spain), Windar Renovables (Spain) | Large yard capacity, 200+ jackets track record |
| Middle East | Lamprell (UAE) | Cost-competitive, serial production line since 2023 |
| East Asia | SK Oceanplant (Korea), CNOOC Zhuhai (China), Century Wind Power (Taiwan) | Massive yard expansion, floating foundation capability |
| Southeast Asia | CS Wind (Vietnam), PV Shipyard (Vietnam) | Rapidly scaling for export to European markets |
Critical Procurement Factors
- Yard Capacity and Lead Times
- Serial production capability varies widely. Top-tier yards like Smulders produce over one jacket per week, while newer entrants may need 4–6 weeks per unit. SK Oceanplant is building what will be the worlds largest substructure production base at 2.5 million square meters.
- Quayside and Logistics
- Jacket foundations weighing 500–1,500 tonnes require deep-water quaysides and heavy-lift crane access. Yards with direct sea access (e.g., Lamprell at Hamriyah, Navantia at Fene) reduce costly overland transport.
- Certifications
- EN 1090-2 EXC4, ISO 3834-2, and DNV-SE-0074 are baseline requirements. Buyers should verify welding procedure qualifications for the specific steel grades (S355–S460) and plate thicknesses involved.
Emerging Trends
The shift toward deeper water sites (60m+) and larger turbines (15 MW+) is driving demand for heavier, more complex jacket designs. Three-legged jackets are gaining ground over traditional four-legged configurations due to reduced steel weight and faster fabrication. Meanwhile, Chinese and Vietnamese fabricators are increasingly exporting to European projects, as demonstrated by CNOOC Zhuhai delivering the largest single-unit capacity jacket for a European wind farm in late 2025.