Mazama Energy Secures $135 Million Series B for Super-Hot-Rock Geothermal Development

Mazama Energy has successfully completed an oversubscribed Series B funding round, raising $135 million. This investment is earmarked for the development of horizontal wells designed to tap into super-hot rock geothermal resources. The company intends to begin generating electricity next year from its initial site in Oregon.

The startup secured $135 million in its Series B round. Its Oregon site is projected to generate 10 gigawatts of electricity, a notable increase from the 5 gigawatts estimated by investor Vinod Khosla last year. Mazama aims for the first site to achieve 200 megawatts of electricity production by 2030, with each well capable of generating 15 megawatts.

The investment round was co-led by Centaurus Capital and Doerr Capital. Other participants included ConocoPhillips, Shell Ventures, SiteGround Capital, H. Barton Asset Management, and the Jeffrey and Marieke Rothschild Foundation. Existing investors Khosla Ventures and Gates Frontier also contributed to the round. Mazama Energy was originally incubated by Khosla Ventures.

Enhanced geothermal startups, such as Mazama, are emerging as a crucial power source for AI data centres and other substantial grid requirements. Their technology targets deeper, hotter rock formations, enabling the creation of a “supercritical” fluid that absorbs considerably more energy than conventional steam. This innovative approach could allow each well to produce up to ten times more power than traditional geothermal methods.

Tapping into just one percent of super-hot rock globally could generate over 63 terawatts of electricity, highlighting the significant potential of this technology.

Mazama Energy is set to commence electricity generation next year, with the full development of its first Oregon site anticipated by 2030. The company has also secured land for a second development, indicating plans for future expansion in the enhanced geothermal sector.