There's a version of the energy constraint story that's been told many times: data centers need more power, the grid can't keep up, and hyperscalers are signing unprecedented offtake agreements. It's true, and it matters, but it's also the most visible part of a much larger structural shift.
The global energy system was designed for a world where power is generated in a handful of vast, fixed locations and transmitted across long-haul grids to wherever it's needed. That architecture worked when demand was diffuse and predictable. It breaks down when you need gigawatts of firm power delivered fast to coastal data centers, or when you're a Pacific Island nation that imports diesel at $0.40/kWh because you have no alternatives, or when you're a naval installation that cannot afford to depend on a fuel supply chain that runs through contested waters. Now layer on top of that a new category of demand that didn’t exist five years ago: AI data centers consuming power at a scale and concentration the grid was never designed to absorb. The old architecture isn’t just straining under this pressure — it’s the wrong tool for the problem.
That's what Endurance Energy was founded to solve, and it's why we're proud to announce our investment in their Series A alongside Founders Fund, Point72, Riot, and others.
Endurance's insight is deceptively simple: most of the planet's accessible geothermal energy sits under the ocean, and they are the first to build the infrastructure to reach it. Along mid-ocean ridges — the 60,000 km of underwater mountain ranges where tectonic plates pull apart and the Earth's interior comes closest to the surface — superheated water flows naturally through cracks in thin ocean crust at temperatures up to 450°C. Endurance drills very shallow wells — 5x shallower than traditional land-based enhanced geothermal — to access this heat, which they then use to spin turbines inside standardized generator units they maintain on the seafloor. The electricity from that process travels to shore through submarine cables, delivering firm power.
Endurance has figured out how to industrialize access to this energy, and the architecture of how they've done it matters as much as the resource itself. The generator units are modular and factory-built, and the deployment process is designed to be repeatable along ridge segments that stretch for thousands of kilometers. The scaling logic is closer to how you'd think about a satellite constellation than a traditional power plant: manufacture identical units, deploy them continuously, and let the fixed infrastructure costs amortize across a growing base.
At gigawatt scale, Endurance would make subsea geothermal the cheapest and most reliable clean power on Earth.
The market this unlocks is broader than the hyperscaler headline. Pacific Island nations like Tonga, Guam, Fiji, and dozens more collectively spend billions annually on imported diesel because they have no alternative to meet the minimum demands of their respective grids. Coastal military installations in the Pacific face real strategic vulnerability in any scenario where fuel supply chains are disrupted. Industrial sites like desalination plants, which are almost universally located on coastlines and are among the most energy-intensive industrial processes in the world, have nowhere to turn as water scarcity accelerates. These are high-value, supply-constrained markets where Endurance's combination of modularity, clean power, and fast deployment has no current competition.
The Endurance team is ultimately what makes us believe this can be built: Andrew Redd, the founder and CEO, led critical systems development for Starship at SpaceX before starting Endurance.
Endurance deployed its first hardware to the seafloor in August 2025. The next milestone comes later this fall when the conversation shifts from physics to deployment as their 100 kW generator becomes the first subsea geothermal electricity generation in history. The opportunity here isn't just the AI power demand that everyone is talking about. It's the chance to rewire how energy resilience works for the parts of the world that the existing grid was never designed to serve. That's a once-in-a-generation infrastructure problem and Endurance is the team to solve it.
Endurance is hiring across engineering and operations. Learn more at enduranceenergy.com.