The Next Generation of Floating Offshore Wind

| Ultra light-weight, corrosion resistant, concrete hull using motion-mitigation to reduce cost and improve performance.


Building off of the success of the University of Maine’s patented VolturnUS concrete hull technology, VolturnUS+ provides a lighter weight hull, enhanced through motion mitigation technology.


  • Arpa-e phase I funding through Atlantis program
  • Arpa-e phase II funding received
    1:10 scale demonstration project off the coast of Castine, Maine anticipated for 2024
  • State of Maine – Gulf of Maine Research Array
    The Governor’s Energy Office submitted an application to BOEM to lease a 15.2 square-mile site in the Gulf of Maine for the nation’s first floating offshore wind research site in federal waters.


Concrete construction gives benefits over steel

  • VolturnUS+ streamlined concrete hull technology provides the same benefits as VolturnUS, with the added advantage of being lighter, less expensive, and easier to deploy.
  • Industrialized pre-cast bridge construction techniques that can be made anywhere in the world using locally sourced material and labor
  • Lower cost per ton; lower overall Levelized Cost of Energy (LCOE)
  • Higher corrosion resistance than steel; lower Operation and Maintenance (O&M) costs and longer design life
  • Heavier than an equivalent steel system; low center of gravity and high center of buoyancy yield excellent wave motion resistance

Optimized & Simple Design

  • Barge style hull uses less material with a simple geometric design allows VolturnUS+ to utilize motion mitigation technology unfeasible in more complex designs
  • Simple design also allows for faster construction and deployment.

Mobility & Ease of Deployment

  • Low tow-out draft allows for deployment in shallow water harbors around the globe. VolturnUS+ can be disconnected and returned to port for maintenance or turbine upgrades
  • Lighter, smaller design requires less infrastructure needs in deployment.

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