Mazama Energy has secured $135 million in funding to advance its super-hot-rock geothermal technology, marking a significant milestone for the emerging clean energy sector. The funding round was led by Centaurus Capital and Doerr Capital, with participation from major energy players ConocoPhillips and Shell Ventures. Existing investors Khosla Ventures and Gates Frontier returned for this round, alongside new participants including SiteGround Capital, H. Barton Asset Management, and the Jeffrey and Marieke Rothschild Foundation. The company was originally incubated at Khosla Ventures.
The fresh capital will support Mazama’s development of horizontal wells that drill into super-hot rocks, with each well capable of generating 15 megawatts of electricity. This technology targets significantly deeper underground resources than traditional geothermal projects. Mazama has already drilled past 10,000 feet in just 15 days, heading toward a target depth of approximately 15,000 feet. At these extreme depths, the company can access temperatures reaching 750 degrees Fahrenheit, or 400 degrees Celsius.
At such high temperatures and pressures, water transforms into what scientists call a supercritical fluid, existing in a state that is neither fully liquid nor fully gas. This unique state allows the fluid to absorb far more energy than ordinary steam, making the technology remarkably efficient. According to Mazama, each of its wells can produce up to 10 times more power than traditional geothermal technologies, representing a substantial leap forward in geothermal energy generation.
The company’s first site in Oregon demonstrates the massive potential of this approach. Mazama now estimates the site is capable of producing 10 gigawatts of electricity, a dramatic increase from last year’s estimate of 5 gigawatts. The company plans to begin generating electricity sometime in 2027 and aims to complete the full development of its first site by 2030, at which point it should be producing 200 megawatts of electricity. Mazama has already secured land for a second development site, signaling its confidence in the technology’s scalability.
The global potential for super-hot-rock geothermal energy is enormous. Research from the University of Twente and the Clean Air Task Force suggests that tapping just 1 percent of super-hot rock worldwide could generate more than 63 terawatts of electricity. This positions enhanced geothermal technology as a potentially transformative solution for meeting growing electricity demands, particularly for power-intensive applications like data centers supporting artificial intelligence operations.
Enhanced geothermal startups like Mazama are emerging as unexpected contenders in the race to provide reliable, round-the-clock power for large-scale electricity consumers. While technology companies and data center developers have largely focused on natural gas to meet their energy needs, geothermal companies have been rapidly advancing their drilling and energy extraction technologies, positioning themselves as a cleaner alternative for constant baseload power generation.
