Oregon geothermal project reached 629°F underground and raised $135 million for deeper drilling
Miles beneath the high desert of central Oregon, an ambitious clean energy startup is drilling directly into the subterranean flanks of an active volcano, forcing specialized drill bits through rock hot enough to melt standard equipment.
Last October, Mazama Energy recorded a blistering 629°F (331°C) miles underground at its pilot site, setting a world record for the hottest enhanced geothermal system ever constructed. Armed with $135 million in fresh venture capital, the company is pushing deeper, chasing an extreme temperature threshold that could redefine clean baseload power across the United States.
A record drilled into volcanic rock
Mazama set its historic temperature mark at a depth of 10,350 feet near central Oregon’s Newberry Volcano. Supported by a U.S. Department of Energy grant, the achievement earned immediate praise from industry veterans.
Superhot subterranean rock yields exponentially more thermal energy per gallon of fluid, allowing operators to generate far more power with drastically fewer wells.
Dr. John McLennan of Utah FORGE—a federally funded geothermal laboratory—hailed the breakthrough as a proof of concept opening the door to deeper energy reserves across the American West.
In deep drilling, operational speed dictates commercial survival. With specialized rigs costing upwards of $100,000 per day to lease, every hour saved preserves vital capital.
Demonstrating rapid maturity, Mazama drilled its second well to the identical depth nearly 80 percent faster than its initial attempt. Now, engineers are extending those boreholes toward 752°F (400°C). Reaching that threshold would allow a single superhot well to harvest up to ten times the electrical output of a conventional 392°F geothermal well.
Why superhot rock changes the economics of geothermal
Traditional geothermal plants rely on rare natural reservoirs of underground steam and hot water—geographical anomalies that severely restrict where facilities can operate.
Enhanced geothermal systems bypass this limitation by drilling miles into hot, dry bedrock, fracturing granite to construct an artificial underground radiator, and circulating water to capture heat.
The fundamental economics depend entirely on temperature. Superhot subterranean rock yields exponentially more thermal energy per gallon of fluid, allowing operators to generate far more power with drastically fewer wells.
Because well construction accounts for most capital expenditure, maximizing output per hole dramatically lowers electricity production costs. Reaching 752°F represents the critical commercial tipping point for the entire industry.
Who is backing the bet — and why
Investor confidence in superhot rock is surging. Mazama’s $135 million Series B financing round was heavily oversubscribed, led by billionaire John Arnold’s Centaurus Capital alongside Doerr Capital, with continued support from Khosla Ventures and Gates Frontier.
Equally significant is the strategic presence of oil heavyweights ConocoPhillips and Shell Ventures. CEO Vasantharajan—a chemical engineer with deep experience managing high-pressure petroleum reservoirs—brings the exact expertise required to navigate extreme volcanic environments.
Arnold emphasized that superhot geothermal provides continuous, carbon-free baseload power with a minimal surface footprint, though scaling the technology requires aggressive technical innovation.
Project Ceres: The blueprint for scale
The newly secured capital will directly finance Project Ceres, a Department of Energy-partnered initiative marking Mazama’s transition from experimental testing to commercial viability.
By adapting horizontal drilling techniques perfected in the American shale revolution, Project Ceres aims to deliver 15 megawatts of clean electricity capacity from a single wellhead.
Field operations will accelerate later this year, with full multi-well testing targeted for early 2026. Mazama executives view Project Ceres as the foundational blueprint for a standardized, commercially scalable superhot energy platform.
A crowded race at the frontier of geothermal
Mazama is leading a broader American geothermal renaissance. Competitors across the West are attracting major capital: Fervo Energy inked a landmark power agreement with Google in Utah, Sage Geosystems demonstrated commercial power delivery in Texas, and Quaise Energy raised $180 million to test millimeter-wave drilling near Newberry Volcano.
Yet as these companies race to tap the hundreds of gigawatts sleeping beneath the American continent, the true revelation of the superhot revolution is finally emerging.
The massive oil and gas industry isn’t being displaced by geothermal—it is quietly becoming its parent engine. The specialized rigs, deep-water drilling physics, horizontal fracking methods, and subsurface engineering that built the petroleum economy represent the exact assets needed to harvest volcanic heat, turning fossil fuel infrastructure into the ultimate perpetual clean energy engine.
Kelly is an experienced writer with 15 years of experience exploring the big stories that shape our world, from tech breakthroughs and space exploration to climate, energy, and the fascinating quirks of science. She has a talent for turning complex ideas into sharp, memorable insights that stay with readers long after they’ve finished reading.
