#USA #Seattle #Geothermal #Endurance Energy #subsea power

Endurance Energy's Historic Subsea Achievement

Endurance Energy, a Seattle-based startup, has made a groundbreaking advancement in renewable energy with its recent successful demonstration of subsea geothermal power. This remarkable achievement took place at the Axial Seamount, located approximately 300 miles off the coast of Oregon, where the company drilled and completed the world’s first subsea geothermal well alongside the operation of a corresponding power plant, situated nearly a mile deep in the Pacific Ocean.

The Adélie Test Plant

The deployment, referred to as the Adélie test plant, marks a stunning progress in geothermal energy utilization. For three weeks, the team focused on proving the feasibility of subsea geothermal energy systems, successfully generating more electricity than was consumed, tapping into the heat from an active underwater volcano. Andrew Redd, the founder and CEO of Endurance Energy, stated, “On September 27, we put a power plant on an active underwater volcano and made power,” indicating the extraordinary nature of their accomplishment.

What Was Achieved

During the dynamic testing, Endurance Energy proved several critical points:
1. Subsea Well Drilling: The successful drilling and completion of a geothermal well on the ocean floor demonstrated the technology's viability. The well reached depths of around 5,000 feet, encountering hydrothermal fluid, and was capped appropriately to harness geothermal heat effectively.
2. Remote Operations: The Adélie power plant was expertly controlled from Seattle via a seafloor fiber-optic network, showcasing the potential for remote management of subsea energy systems.
3. Net-Positive Electricity: The test yielded net-positive electricity generation, with the power system reaching speeds of approximately 26,000 revolutions per minute, validating the concept that subsea geothermal systems can produce more energy than they consume.

Learning and Future Goals

Despite the successes, the testing phase also highlighted challenges, as the geothermal well delivered hot fluid that occasionally restricted the plant’s operation. The positive run achieved was curtailed temporarily due to system protections but provides crucial data for refining the subsea geothermal system. The insights gained will inform the development of future systems aimed at commercial viability.

Environmental Considerations

Endurance Energy took proactive steps to monitor environmental effects throughout the deployment. The team initiated an environmental oversight program that involved mapping the seafloor before equipment placement, sampling water, and documenting marine life surrounding the test site to ensure minimal disruption to the natural habitat.

Looking Ahead

With the success of Adélie, Endurance Energy plans to launch an upgraded version named Gentoo in winter, aiming for higher power generation capabilities. Their sights are set on expanding operations with deeper wells to achieve sustained electricity generation. In parallel, they are in the process of developing a 2-megawatt commercial generator named Leopard.

The company is also advancing its first commercial project in Tonga, targeting to deliver clean energy directly to the grid by 2027.

Conclusion

Endurance Energy is not only pioneering subsea geothermal technology but is also shaping the future of renewable energy generation in coastal regions and around the globe. Their revolutionary methods hold the promise of a more sustainable energy landscape, combatting climate change through innovative solutions. As they proceed towards commercialization, the future looks bright for subsea geothermal energy initiatives.