Suction Anchors for Ocean Energy

Driving Down the Cost of Offshore Clean Energy

The US has set ambitious targets for deployment and cost reduction of offshore clean energy to help reach its net zero emissions goals. Sperra has developed a patent-pending 3D-printed concrete suction anchor that is estimated to be 63% less expensive than steel, utilizing 100% domestic content.

Key Advantages of Sperra Suction Anchors

Reduced Cost

Sperra suction anchors reduce the levelized cost of offshore wind and solar when compared to steel anchors.


3D printed concrete materials for suction anchors can meet or exceed the performance of cast concrete materials in marine applications.

concrete suction
rusty corrosion

Corrosion resistance

Concrete is inherently resistant to corrosion, unlike steel, which can corrode in marine environments. By eliminating the steel shell and incorporating corrosion-proof, non-metallic reinforcement, our concrete suction anchor offers enhanced durability and longevity in marine applications. ​

rusty corrosion

Manufacturing Efficiency

Manufacturing suction anchors using the concrete extrusion/spraying method eliminates the need for formwork and increases production rates, reducing manufacturing time and costs.

Increased domestic content and local jobs

Utilizing ubiquitous concrete as the primary material reduces reliance on imported steel and promotes the use of local materials and workforces, creating jobs and economic benefits.

Machine work

Did you know?

Steel anchors are among the top three most expensive components in a floating wind plant due largely to the higher cost of steel materials, which are also susceptible to supply chain challenges. Using low-cost concrete that is available locally reduces these costs.

How do they work?

Suction anchors for floating offshore wind are a relatively recent innovation based on similar technologies used for offshore oil and gas foundations. Suction anchors utilize the suction or negative pressure created within the hollow anchor to secure it to the seabed. ​ ​The suction is created by removing water or soil from inside the anchor, creating a low-pressure zone. This causes the anchor to be pulled into the seabed, creating a strong holding force. The mooring line, which is connected to the anchor, transfers the load from the floating offshore wind turbine to the anchor, ensuring stability and preventing the turbine from drifting.

Funding Provided by

US National Science Foundation logo
scottish government logo
Colorado office of economic development logo
California energy commission logo
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