Subsea geothermal test plant that demonstrated net-positive electricity at Axial Seamount in September 2026.
Adélie is Endurance Energy’s subsea geothermal test plant, deployed for a three-week demonstration at Axial Seamount, about 5,000 feet beneath the Pacific. The team drilled and completed a geothermal well, landed and remotely operated the plant from Seattle, and tested it with hot fluid from a nearby natural vent. During one 8.7-second run, the system generated more electricity than it consumed. The test was intended to expose engineering challenges and gather data for future systems; the company describes Adélie as a test article, not a commercial-scale power plant.
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