Mazama Energy raises $135 million to drill ultra-hot rocks: deep geothermal competes with gas to power data centers

Mazama Energy raised $135 million in a Series B financing round that exceeded its target subscription, in a move aimed at accelerating horizontal drilling of ultra-hot rock wells capable of generating 15 MW of electricity per well. The company plans to start generating electricity next year, confirming that its first site in Oregon has a capacity to produce 10 GW of electricity, a sharp upward revision compared with last year’s estimates announced by investor Venod Hosla when he capped the site’s potential at about five gigawatts.

Enhanced geothermal startup companies are becoming the dark horse in the battle to power artificial-intelligence data centersand the massive electrical loads on transmission networks. While tech companies and compute-center developers have leaned on natural gas to fill the immediate gap, geothermal technologies are advancing rapidly, surpassing the constraints of earlier projects by targeting deeper and hotter rock layers.

The drilling depth achieved by the company exceeded ten thousand feet in just fifteen days, on its way to a depth of roughly fifteen thousand feet. These depths grant access to temperatures up to 750 F (about 400 C), an environment that turns water under extreme pressure into a supercritical fluid, an intermediate phase that is neither a pure liquid nor a full gas, giving it a superior energy-absorption capacity compared with conventional steam and allowing a single well to produce energy about ten times that of traditional technologies.

Betting on ultra-hot rocks goes beyond the limits of a single experiment to touch a continuous source of primary energy.Exploiting just one percent of these rocks worldwide could generate more than 63 TW of electricity, according to studies by the University of Tifenti and the Clean Air Task Force. Although the Oregon site remains in early stages with a target of reaching 200 MW by 2030, the company has already secured land to develop a second site. The financing round was led by Centaurus Capital and Duwer Capital, with notable participation from Conoco Phillips and Shell Ventures, along with existing investors such as Hosla Ventures and Gates Frontier, and new entrants like Site Ground Capital, the Jeffrey and Mariki Rothschild Foundation, and H. Barton Asset Management.

In my view, as editor-in-chief monitoring AI infrastructure shifts, this financing imposes an analytical change on computing plans in the Gulf and Egypt, where data-center operators face the dilemma of reconciling 24-hour power demands with sustainability commitments. The entry of major energy firms such as Shell and Conoco Phillips into this arena demonstrates that the skills required for this technology, horizontal drilling and reservoir engineering under extreme pressure and temperature, constitute the core of regional energy expertise. This trajectory allows operators and investors in the region to consider deep geothermal energy as a technical extension of existing drilling assets and a potential alternative that frees networks from full reliance on gas turbines, which consume fuel reserves and face supply-chain volatility.

These experiments show that the AI race will not be decided by model and chip efficiency alone, but by the ability to secure clean, stable power at the point of consumption. Monitoring deep-drilling economics today gives decision-makers a precise view of the path that the cost of megawatts feeding high-performance compute centers will follow over the current decade.