Mazama Energy Raises $135M to Drill Super‑Hot Geothermal Wells
Geothermal startup Mazama Energy has closed a $135 million Series B round to advance its horizontal‑well technology in super‑hot rocks. The company plans to produce 15 MW per well and expects its first Oregon site to reach 200 MW by 2030. The funding, led by Centaurus Capital and Doerr Capital, sig…
By Felo News Desk · Published
Geothermal startup Mazama Energy announced on Thursday that it has closed a $135 million Series B financing round, a move that will accelerate the development of its horizontal‑well technology in super‑hot rock formations. The funding, which was oversubscribed, will enable the company to drill deeper wells capable of producing up to 15 megawatts of electricity each, a ten‑fold increase over conventional geothermal plants.
What the Funding Means for Mazama’s Technology
Unlike traditional geothermal projects that tap shallow, moderate‑temperature reservoirs, Mazama’s approach targets depths of 15,000 feet where temperatures reach 750 °F (400 °C). At these extreme conditions, water becomes a supercritical fluid that can absorb and release energy far more efficiently than steam. The company claims that this allows each well to generate up to ten times the power of standard geothermal wells.
With the new capital, Mazama plans to drill horizontal wells that will penetrate these hot zones, extracting the supercritical fluid and converting it into electricity. The company estimates that its first site in Oregon could eventually produce 200 MW of power by 2030, up from the 10 GW potential it announced last year. This represents a significant scaling of the technology and a bold step toward commercial viability.
Investor Landscape and Strategic Partnerships
The Series B round was led by Centaurus Capital and Doerr Capital, with participation from energy majors ConocoPhillips and Shell Ventures. Existing backers such as Khosla Ventures and Gates Frontier re‑invested, while new investors SiteGround Capital, H. Barton Asset Management, and the Jeffrey and Marieke Rothschild Foundation joined the table. The involvement of both venture capital and large oil & gas firms underscores the growing interest in geothermal as a clean, baseload energy source.
Vinod Khosla, the founder of Khosla Ventures and an early supporter of Mazama, has been vocal about the potential of enhanced geothermal systems (EGS) to meet the power demands of data centers and other large consumers. The company’s technology could provide a reliable, low‑carbon alternative to natural gas, which has been the preferred choice for many tech firms seeking to power their facilities.
Why Super‑Hot Geothermal is a Game Changer
Enhanced geothermal startups are positioning themselves as dark horses in the race to supply clean energy for high‑load applications. By drilling deeper and accessing hotter reservoirs, they can achieve higher efficiencies and lower operating costs. According to studies by the University of Twente and the Clean Air Task Force, tapping just 1 % of the world’s super‑hot rock could generate more than 63 terawatts of electricity—a figure that dwarfs current global renewable output.
While the technology is still in its early stages, Mazama has already secured land for a second development site and is working to complete the first site’s development by 2030. If successful, the company could set a new benchmark for geothermal power generation and provide a scalable, carbon‑free solution for the growing energy needs of the digital economy.
What’s Next for Mazama Energy?
Following the funding announcement, Mazama will focus on drilling the first horizontal wells at its Oregon site and begin electricity generation in the next calendar year. The company plans to expand its operations to additional sites once the technology proves commercially viable. Investors and industry observers will be watching closely to see whether the company can deliver on its ambitious targets and help shift the energy mix away from fossil fuels.
In the broader context, the investment reflects a shift in the clean‑energy landscape, where investors are increasingly backing technologies that can provide reliable, baseload power without the intermittency issues of solar and wind. As data centers and other large‑scale consumers demand more sustainable energy, enhanced geothermal could play a pivotal role in meeting those needs.
Key facts
- $135M Series B round led by Centaurus and Doerr Capital
- Technology targets 15,000‑ft super‑hot rock for 15 MW per well
- First Oregon site aims for 200 MW by 2030
- Investors include Khosla Ventures, ConocoPhillips, Shell Ventures
- Super‑hot geothermal could supply 63 TW if 1 % tapped
Why it matters
The funding marks a pivotal moment for enhanced geothermal, positioning it as a viable competitor to natural gas for large‑scale power generation. If Mazama’s technology succeeds, it could unlock vast amounts of clean energy from deep‑earth heat, supporting the transition to a low‑carbon grid.
Frequently asked questions
What is super‑hot geothermal?
Super‑hot geothermal refers to heat extracted from rock formations deeper than 10,000 feet, where temperatures exceed 700 °F. At these depths, water becomes a supercritical fluid that can generate electricity more efficiently than traditional steam.
How does Mazama’s technology differ from conventional geothermal?
Mazama drills horizontal wells into super‑hot rock, creating a supercritical fluid that can absorb more energy. This allows each well to produce up to ten times the power of conventional geothermal wells.
Who are the main investors in Mazama’s Series B?
The round was led by Centaurus Capital and Doerr Capital, with participation from ConocoPhillips, Shell Ventures, Khosla Ventures, Gates Frontier, SiteGround Capital, H. Barton Asset Management, and the Jeffrey and Marieke Rothschild Foundation.
Sources
- [1] techcrunch.com — originally reported as “Khosla-backed Mazama Energy just raised $135M to drill deeper into super-hot-rock geothermal”
