SpaceX Alum’s Critical Energy Raises $22M to Transform Rocket Engine Tech into Modular Geothermal Power Plants for Data Centers

The Geothermal Dark Horse Emerges: SpaceX Alum Raises $22M to Turn Rocket Engines into Power Plants for Data Centers

By: Robert Buluma 

In the grand narrative of global energy transition, nuclear fusion often grabs sci‑fi headlines, while solar and wind bask in policy support and investor enthusiasm. Yet a force from deep underground is quietly rising, storming center stage as an unlikely contender. This week, Critical Energy—a startup founded by a SpaceX alumnus—announced a $22 million funding round to transform rocket‑engine technology into modular geothermal turbines, aiming to deliver steady, clean baseload power to the data centers that power the artificial‑intelligence age.

The capital injection is not merely a bet on a fledgling company; it is a signal that geothermal energy is emerging as the next “unicorn” sector in clean tech. With AI compute demand growing exponentially, Critical Energy appears precisely at the intersection of two massive waves: the tech industry’s insatiable hunger for reliable, carbon‑free electricity, and the application of advanced manufacturing to overhaul conventional energy hardware.

The Silent Giant: Geothermal’s Underestimated Potential

For decades, geothermal energy has lingered on the fringes of renewable‑energy discussions, overshadowed by the sexier appeal of fusion or the ubiquity of solar panels. This silence belies its staggering potential. According to the International Energy Agency (IEA), the world’s accessible geothermal resource base is at least 42 terawatts—more than double the total global energy consumption recorded last year.

The numbers lay bare a reality that has been largely ignored: Earth itself is a giant nuclear reactor, its internal heat practically inexhaustible. Even more encouraging, the IEA estimates that with current technologies under development, nations could cost‑effectively deploy over 800 gigawatts of geothermal generating capacity—equivalent to the combined electricity demand of the United States and India today.

Underinvestment has long been the primary obstacle to geothermal growth. But the wind is shifting. Technological breakthroughs, particularly in Enhanced Geothermal Systems (EGS), now allow developers to tap heat in regions previously considered geologically unpromising. At the same time, a new customer class with immense and urgent power needs has emerged: the data‑center industry.

AI’s Energy Anxiety and the Data Center Savior

The race for artificial intelligence is, at its core, a race for energy. The data centers that train and run massive AI models are ravenous consumers of electricity, and they demand round‑the‑clock reliability alongside strict carbon‑reduction commitments. Traditional wind and solar cannot deliver 24/7 baseload power due to weather and time‑of‑day variability. Nuclear energy, while clean and steady, faces hurdles of public acceptance, long construction timelines, and soaring costs.

Geothermal fills this gap perfectly: it is clean, firm, renewable, and always on. That is precisely why tech giants are turning their gaze below ground. According to recent analyses, advanced geothermal could meet nearly two‑thirds of new data‑center electricity demand before 2030.

Over the past two years, Google, Meta, Microsoft, and Amazon have signed a cascade of agreements with geothermal developers. In March 2026, Fervo Energy inked a landmark 3‑gigawatt framework deal with Google. The market has spoken with real dollars: geothermal is no longer a niche player but a vital piece of the AI‑energy puzzle.

Yet just as this “geothermal gold rush” gathers momentum, a critical bottleneck has come into focus—turbines are becoming the weak link.

The Turbine Gap: A Multibillion‑Dollar Supply‑Chain Problem

“A lot of projects are now specifying large turbines, but those units can take months or even years to assemble on site,” observed Spencer Jackson, co‑founder and CEO of Critical Energy.

This sounds like a routine supply‑chain hiccup, but it reflects a clash of two industrial paradigms. Traditional large turbines are built for massive, centralized power stations—they are enormous, highly customized, and slow to manufacture and install. On the eve of a geothermal boom, this “artisanal” supply model is proving woefully inadequate.

Jackson spotted the gap with an engineer’s eye. His solution draws directly from his experience at SpaceX: modularity, rapid iteration, and factory‑scale production.

From Rockets to the Earth’s Core: A SpaceX‑Bred Disruption

The core advantage of Critical Energy lies in the “rocket‑science” pedigree of its founding team. Spencer Jackson worked on Falcon Heavy, Starship, and the Raptor rocket engine at SpaceX. Now he is applying the same engineering mindset to geothermal turbines.

The crossover is not as far‑fetched as it sounds. Turbines—whether for rockets or power plants—are rotating machines driven by fluid (gas or steam) to produce work. They share fundamental challenges in materials science, thermodynamics, and precision manufacturing. Rocket engines must achieve extreme thrust‑to‑weight ratios and reliability under punishing conditions; geothermal turbines must endure corrosive brines and scaling while running for decades.

“We’re looking for the fastest path to grid‑scale, gigawatt‑level power,” Jackson said. That path is embodied in the company’s Apex series of modular power‑generation units. Critical Energy has unveiled two flagship products: the Apex 2500 (2.5 MW) for conventional geothermal resources, and the Apex 5000 (5 MW) specifically tailored for Enhanced Geothermal Systems.

The modular approach offers four compelling advantages:

1. Factory production – Units are assembled on production lines like automobiles, ensuring consistent quality, speed, and cost control.

2. Rapid deployment – Equipment can be shipped like shipping containers and installed on site within two weeks—a critical feature for time‑sensitive data‑center construction.

3. Flexible scaling – Data centers can deploy exactly the number of modules needed, adding capacity incrementally as demand grows.

4. Lower financing risk – Smaller, standardized units reduce the upfront capital burden and shorten project timelines, making it easier to secure project finance.

With the fresh capital—comprising $19 million in seed funding and $3 million in venture debt from Silicon Valley Bank—Critical Energy aims to complete its first commercial 2.5‑MW project by 2027, likely at an established geothermal field such as those in Iceland or The Geysers in Northern California.

“Geothermal will happen faster than fusion—much faster,” Jackson predicted confidently. “Within four or five years, I want us to be producing multiple gigawatts of power annually.”

A Bigger Play: Paving the Way for the EGS Era

Critical Energy’s ambitions extend far beyond servicing traditional geothermal fields. The Apex 5000 module is designed specifically for EGS pioneers like Fervo Energy. EGS uses hydraulic stimulation—similar to fracking—to create artificial reservoirs in hot, dry rock formations, effectively unlocking geothermal potential in regions without natural permeability or fluid.

EGS is widely seen as the “holy grail” of geothermal energy, capable of transforming it from a geographically constrained niche into a globally deployable baseload source. As early movers like Fervo prove commercial‑scale viability, the demand for compatible turbines will explode. Critical Energy’s modular units are being positioned as the off‑the‑shelf “standard parts” for that EGS‑powered future.

Jackson even foresees a moment when traditional oil‑and‑gas companies pivot en masse into geothermal. “The great thing about geothermal is that the oil and gas industry knows how to drill—hundreds or thousands of wells, at scale,” he said. “They’re very good at it. But they’ll need turbines, and there’s going to be a massive shortage.”

The Competitive Landscape and Market Opportunity

Critical Energy is not alone in spotting the turbine opportunity, but its approach stands out. Competitors like Ormat Technologies and Mitsubishi Heavy Industries offer proven, large‑scale geothermal turbines, yet their lead times and customization requirements leave a growing gap for smaller, faster projects. Newer entrants such as Turboden (a Mitsubishi subsidiary) and Atlas Copco have introduced modular ORC (Organic Rankine Cycle) systems, but few bring the rocket‑grade manufacturing ethos that Critical Energy champions.

The timing is also fortuitous. The U.S. Department of Energy has ramped up funding for geothermal demonstration projects under its Enhanced Geothermal Shot™ initiative, aiming to reduce EGS costs by 90% by 2035. Meanwhile, state‑level mandates in California, New York, and other tech‑heavy regions are pushing utilities and large power users toward firm, carbon‑free resources. Data‑center operators, facing both regulatory pressure and public scrutiny, are willing to pay a premium for 24/7 clean power—precisely what geothermal delivers.

According to industry analysts, the global geothermal turbine market, valued at roughly $2.5 billion in 2025, could surpass $12 billion by 2035, with EGS‑compatible modules representing the fastest‑growing segment. Critical Energy’s $22 million seed round positions it to capture an early slice of that expansion.

Technical Deep Dive: What Makes a Rocket‑Derived Turbine Different?

To appreciate the innovation, one must understand the engineering challenges of geothermal power generation. Geothermal fluids are often hot (200–350°C), high‑pressure, and laden with dissolved minerals—silica, chlorides, sulfides—that can corrode or scale turbine blades, reducing efficiency and lifespan. Traditional turbines rely on expensive alloys and frequent maintenance.

Critical Energy’s approach borrows from rocket‑engine design in several ways:

· Advanced coatings – Thermal‑barrier and anti‑corrosion coatings developed for rocket nozzles are adapted to turbine blades, extending service intervals.

· Compact, high‑speed rotors – Like turbopumps in rocket engines, the rotors spin faster than conventional industrial turbines, allowing smaller physical footprints for the same output.

· Predictive digital twins – Real‑time monitoring and AI‑driven predictive maintenance, borrowed from SpaceX’s telemetry culture, reduce downtime and optimize performance.

· Standardized interfaces – Modules are designed to plug into existing steam or brine loops with minimal site‑specific engineering, dramatically cutting engineering, procurement, and construction (EPC) costs.

These features translate into tangible benefits: a projected levelized cost of electricity (LCOE) in the range of $60–$80 per MWh for the Apex 2500, competitive with wind and solar when paired with storage, and significantly cheaper than offshore wind or new nuclear.

Beyond Data Centers: A Scalable Platform for Industrial Heat

While the immediate target is data centers, the modular turbine platform has broader applications. Industrial processes—chemical plants, mining, desalination—require vast amounts of process heat and electricity. Geothermal energy can supply both, and Critical Energy’s units can be co‑located with industrial facilities to provide combined heat and power (CHP).

Furthermore, the company is exploring “geothermal‑battery” hybrids, where excess renewable electricity is used to heat underground reservoirs, storing energy for later generation—a concept that could make geothermal a seasonal storage solution. Jackson hinted that future product iterations might integrate thermal storage, turning the turbine into a dispatchable asset for grid services.

Risks and Challenges Ahead

Despite the promise, Critical Energy faces non‑trivial hurdles. First, geothermal development remains capital‑intensive and carries drilling risk—even with advanced EGS, well costs can reach $5–10 million each, and dry wells remain a possibility. Second, the company must prove that its factory‑built turbines can achieve the longevity (30+ years) expected of power‑generation equipment; rocket engines are designed for minutes of operation, not decades. Third, the supply chain for specialized alloys and coatings is still nascent, and scaling production will require partnerships with foundries and materials suppliers.

Moreover, competition is intensifying. Fervo Energy and other EGS operators may choose to develop their own in‑house turbine designs or partner with established OEMs. Regulatory permitting for new geothermal projects, especially those involving stimulation, can be protracted and faces local opposition in some regions.

Jackson acknowledged these challenges but remained bullish: “We’re not inventing physics; we’re reinventing manufacturing. That’s a problem Silicon Valley and SpaceX have solved before.”

The Strategic Vision: A Gigawatt‑Scale Future

Critical Energy’s road map extends beyond a single 2.5‑MW demonstration. The company envisions “turbine farms”—arrays of dozens or hundreds of Apex units connected to a single geothermal field, collectively producing hundreds of megawatts. With its factory‑based production, the company claims it could scale output to 1 GW per year by the early 2030s, assuming sufficient demand and capital.

That ambition aligns with the broader energy transition. The International Renewable Energy Agency (IRENA) projects that geothermal capacity could grow tenfold by 2050, supplying 3–5% of global electricity. To realize that vision, the industry needs exactly what Critical Energy is building: a reliable, inexpensive, and rapidly deployable turbine supply chain.

Conclusion: The Earth’s Heat, Manufactured at Scale

Critical Energy’s $22 million funding round is not just a milestone for one startup—it marks the moment when geothermal energy transforms from a geographically constrained curiosity into a mainstream, manufacturing‑driven energy sector. Driven by the relentless power demands of AI and the maturation of Enhanced Geothermal Systems, the earth beneath our feet is becoming the next frontier for clean‑energy investment.

By infusing SpaceX’s engineering culture—iterative design, vertical integration, and obsessive focus on manufacturability—into the staid world of power turbines, Critical Energy is attacking a deceptively simple but crucial problem: how to build machines that turn subterranean heat into electricity quickly, cheaply, and at scale.

If successful, the company will not only plug a looming turbine shortage; it will provide a firm foundation for a sustainable, AI‑powered future—where the roar of rocket engines is replaced by the quiet hum of modular turbines, drawing eternal energy from the planet’s core.

See also: Endurance Energy raises $54M to harness a massive untapped energy source on the ocean floor

Sources: Data Center Dynamics, Tech Crunch