Endurance Energy Tests the World's First Subsea Geothermal Well: What the Axial Seamount Demonstration Really Proved What if geothermal energy did not need a power plant on land? What if electricity could be produced directly from the Earth's heat beneath the ocean, with generators sitting on the seafloor and sending power to coastal grids? On October 19, 2026, Seattle-based startup Endurance Energy announced a major step toward that idea. The company said it had drilled and completed the world's first subsea geothermal well and placed a 3-ton test power plant nearly a mile beneath the Pacific. It also reported net-positive electricity from heat at an active underwater volcano, according to its announcement on PR Newswire. The headline numbers are modest. The Adélie prototype produced more electricity than it used for about 8.7 seconds. During that time it delivered a median net output of about 2 kilowatts and a peak of 16.5 kilowatts. One detail matters more than any other...
Croatia Signs Grant Agreement to Drill Four Geothermal Wells for Urban Heating Croatia has approved a major new investment to expand the use of geothermal energy for district heating in four cities. Velika Gorica, Osijek, Vinkovci, and Zaprešić are set to receive an additional EUR 35.3 million for geothermal development, including the drilling of four new wells that could support urban heating systems by 2030. The funding marks the second phase of a broader geothermal program designed to convert Croatia’s underground heat resources into reliable, domestic energy for homes, public buildings, businesses, agriculture, and industry. Across the two phases, the total investment in the four locations is expected to reach approximately EUR 86 million. The project is significant because it moves Croatia’s geothermal strategy beyond exploration. The country is now preparing the infrastructure needed to create production-and-injection well pairs, establish closed geothermal systems, an...