Panthalassa, a renewable energy and ocean technology company, has closed $140 million in Series B financing to advance its platform for generating electricity from ocean waves and using that power to run AI inference computing at sea.
The round was led by Peter Thiel, with participation from John Doerr, Marc Benioff’s TIME Ventures, Max Levchin’s SciFi Ventures, Susquehanna Sustainable Investments, Hanwha Asset Management (USA)’s venture fund, Anthony Pratt, Fortescue Ventures, Future Positive, WTI, Nimble Partners, Super Micro Computer, Sozo Ventures, Dylan Field, Planetary VC, Leblon Capital, Resilience Reserve, Portland Seed Fund, and the Intrepid Oregon Fund. Returning investors include Founders Fund, Gigascale Capital, Lowercarbon Capital, Unless, and WovenEarth.
Ocean-Based Infrastructure
The company’s Ocean-3 nodes are autonomous floating systems mass-produced from plate steel in coastal factories. Deployed in distant ocean regions where wave energy density is highest, the nodes generate electricity continuously and use it onboard to power AI chips rather than transmitting power back to land. Inference output is relayed to shore by satellite. Seawater provides passive cooling, reducing one of the primary engineering and operational costs associated with land-based data centers.
Panthalassa has been developing its core technology stack—power generation, propulsion, autonomy, and at-sea computing—for roughly a decade. Ocean-1, Ocean-2, and Wavehopper prototypes were tested at sea in 2021 and 2024. Ocean-3 pilot nodes are planned for deployment in the northern Pacific in 2026, with commercial operations targeted for 2027. Proceeds from the Series B will complete a pilot manufacturing facility near Portland, Oregon.
Positioning
The company frames the open ocean as one of three energy sources with tens of terawatts of untapped capacity, alongside solar and nuclear. The pitch to investors and potential customers is structural: land-based data center expansion is constrained by grid interconnection queues, cooling water availability, permitting timelines, and community opposition. Panthalassa’s model sidesteps each of those bottlenecks by relocating both power generation and compute to international waters.
Whether the economics hold at commercial scale—manufacturing, maintenance, and satellite bandwidth across open-ocean deployments—remains the central question. The investor roster suggests the concept has cleared a credibility threshold. The engineering proof comes in 2026.
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