Calling for entries from companies and consortia interested in undertaking a study to understand and evaluate onshore and afloat concrete substructure fabrication technologies to determine their feasibility and operating limits.

The Floating Wind JIP Partners would like to investigate the use of concrete as a primary material for floating offshore wind (FOW) substructures and potential advantages when compared to steel alternatives, such as durability, cost, scalability, sustainability and opportunities for local content.

To fully realise the benefits of concrete floaters, regardless of the construction method, the FOW industry must validate the potential cost-effectiveness of material supply, manufacturing, and assembly processes  

Objectives

• Assess the available technologies for both onshore and afloat fabrication of concrete substructures, evaluating their technical feasibility and the potential operating conditions under which they could be deployed.
• Develop relevant representative concrete substructure designs for use in FLW JIP projects.
• Enhance understanding of concrete substructure typologies, core fabrication and assembly methodologies and potential for delivery at large scale.
• Assess the operating conditions under which afloat fabrication may be possible and thereby consider the feasibility of this as a solution in different markets.
• Conduct case studies of robust construction programmes and define reliable cost estimates.

The deadline for clarification questions is 29 January 2026.

The closing date to receive tender submissions is 6 March 2026.

All clarification questions and tender submissions should be sent electronically, by their respective deadlines to arturo.andersen@carbontrust.com, with floatingwind@carbontrust.com in copy.