HIBT Lab! Quaise Energy: Carlos Araque

Episode Summary

Executive Summary: Carlos Araque, CEO of Quaze Energy, explains how his MIT-based startup aims to unlock globally available geothermal power by replacing conventional drill bits with microwave energy that vaporizes rock. The conversation traces his path from oil-and-gas drilling to clean energy, arguing that deep geothermal could repower existing plants, cut emissions, and scale into a major source of firm, carbon-free electricity.

Main Topics: Carlos Araque’s background and engineering mindset (Priority: 4/5): Araque describes growing up in violence-stricken Medellín, discovering an aptitude for engineering by taking apart bikes and motorcycles, and being guided toward MIT by his father. Career in oil and gas drilling technology (Priority: 4/5): He recounts his years at Schlumberger designing downhole tools and learning the full commercial and technical stack behind oil extraction, which later informed his geothermal venture. Why geothermal, not just solar and wind (Priority: 5/5): Araque argues that land use and power density limit solar and wind at civilization scale, while nuclear, fusion, and deep geothermal are the only scalable long-term options. Quaze’s microwave drilling approach (Priority: 5/5): The core technical idea is to use high-intensity electromagnetic waves, specifically microwaves via a gyrotron, to vaporize rock instead of using mechanical drill bits that wear out. Repowering existing power plants (Priority: 5/5): Rather than building entirely new infrastructure, Quaze aims to drill deep wells near existing plants and feed them geothermal steam, making decarbonization faster and cheaper. Scale, cost, and commercialization challenges (Priority: 4/5): The discussion covers funding, projected drilling costs, timelines, regulatory and engineering hurdles, and the potential for oil-and-gas firms to participate in the transition. Global energy potential and urgency (Priority: 5/5): Araque positions deep geothermal as practically inexhaustible and capable of providing a large share of future global energy demand within decades.

Key Arguments: Energy transition has largely stalled because of a technology gap, not just politics; new drilling technology could solve part of that gap. Wind and solar can supply energy, but at global scale their land footprint and lower power density make them less sustainable than commonly assumed. Only three energy sources can realistically scale to civilization-level demand for centuries: nuclear fission, fusion, and deep geothermal. Mechanical drilling becomes inefficient at greater depths because drill bits wear down and must be replaced; microwave drilling avoids that bottleneck. Rock vaporized by microwaves can form a glass-like wall that helps stabilize the borehole. Existing coal or gas plants do not need to be scrapped; they can be repowered by geothermal steam if deep wells are drilled nearby. The oil-and-gas workforce, infrastructure, and investor base can be repurposed for geothermal, preserving jobs and accelerating deployment. Deep geothermal is portrayed as practically limitless because the Earth already leaks more heat than humanity consumes. Quaze believes it can drill 20-kilometer wells in weeks rather than the years or decades needed by prior record-setting drilling projects.

Data Points: Earth core temperature: Over 9,000°F - Used to illustrate the theoretical scale of geothermal energy beneath the surface. Human energy use in 2022: About 23 terawatts - Araque cites this as the current global consumption baseline. Deepest historical borehole: 12.5 kilometers - Referenced as the Soviet-era scientific drilling record. Target geothermal drilling depth: 20 kilometers (12 miles) - Depth Quaze believes is needed to unlock global geothermal access. Drilling time goal: Weeks - Araque says microwave drilling could reach 20 km in weeks rather than years. Oil and gas drilling depth: 2 to 3 kilometers - Typical depth range for oil and gas extraction compared with geothermal targets. Quaze funding raised: $70 million - Amount raised by the company roughly four years into development. Estimated cost per well: $20 million - Projected cost to drill a 20-kilometer geothermal well. Power price target: 1 to 3 cents per kilowatt hour - Araque’s estimate for competitive geothermal electricity costs. Existing power plants worldwide: 10,000 - He says these plants could potentially be repowered rather than retired. San Francisco electricity demand: 14,000 megawatt hours per day - Used to estimate how many geothermal wells might be needed for a city. Wells needed for San Francisco: About 12 - Araque agrees that roughly a dozen 50-MW wells could cover the city’s needs. Well diameter: 8 inches - He says wells are narrow enough to drill in urban or constrained settings. Potential output per well: 50 megawatts - A single geothermal well’s approximate power output in Araque’s example. Current fossil-fuel jobs: 3 million jobs - He cites existing oil-and-gas employment as a workforce that could be leveraged for geothermal. Earth heat leakage: 40 terawatts - Araque argues the planet already loses far more heat than humans currently consume. 2050 global geothermal target: 1 to 5 terawatts - He suggests this could represent about 20% of world energy use by mid-century.

Pivotal Quotes: "The energy transition will happen in our generation. It has to happen." — Carlos Araque: Explaining why he left oil and gas to pursue cleaner energy. "We’re using electromagnetic waves, we’re using microwaves, more precisely, to literally vaporize a hole to rock." — Carlos Araque: Describing Quaze’s core drilling technology. "How about we just repower them with clean geothermal steam?" — Carlos Araque: Arguing that existing power plants can be converted instead of dismantled.

Implications: If Quaze succeeds, geothermal could become a major, dispatchable clean power source that uses existing energy infrastructure, reduces land-use conflicts, and preserves jobs. It would shift decarbonization from a generation-build problem to a drilling-and-repowering problem.