A Boston startup is testing underground lightning strikes to turn ancient rock into a hydrogen factory using machines named Zeus and Thor

Deep beneath the American landscape, ancient subterranean formations in Boston hold an extraordinary secret. Locked within dense, iron-rich stone is enough clean energy to transform the global power grid.

For decades, scientists knew that when water touches these buried minerals, a natural chemical reaction releases pure hydrogen gas.

The catch was always speed and access. Impermeable bedrock kept water locked out, leaving vast energy reserves trapped thousands of feet underground.

Early field trials using steady direct current (DC) power in soft carbonate formations boosted fluid production by 30 percent, but hard igneous rock barely flinched.

Electricity as a rock-breaker

Cracking that ancient stone requires extreme physics. Instead of relying on conventional hydraulic fracturing or heavy drill bits, researchers are turning to high-voltage electrical bursts.

By lowering specialized cylindrical electrodes into deep boreholes, high-voltage pulses fire directly into solid rock.

Each pulse generates an instantaneous plasma channel within the stone itself. That channel expands violently, sending shock waves that shatter the bedrock into a network of fine micro-fractures.Once open, these fissures act as conduits, allowing injected water to flood previously unreachable iron-bearing minerals.

The core physics traces back to 1955, when physicist Lev Yutkin observed lightning strike a submerged log, shattering it instantly. His discovery of the electrohydraulic effect laid the theoretical foundation for medical kidney stone lithotripters—and now, deep-earth energy extraction.

Why hydrogen from rock is worth chasing

Stimulated geologic hydrogen offers a compelling alternative to current clean energy options. Electrolysis remains prohibitively expensive, while steam-methane reforming produces heavy carbon emissions.

Meanwhile, U.S. industrial demand for hydrogen continues to climb past 10 million U.S. tons annually, part of a global market exceeding 110 million tons.

The raw material underground is practically inexhaustible. Former ARPA-E program director Douglas Wicks estimated that accessible iron in Earth’s crust could theoretically generate quadrillions of tons of hydrogen.

Capturing just one percent of that potential within the United States could power the nation’s economy for thousands of years.

Recognizing this monumental potential, the U.S. Department of Energy’s ARPA-E program awarded $20 million across 16 research teams to advance stimulated geologic hydrogen, with Eden receiving $900,000 for its electrical approach.

From lab bench to horse farm: Eden’s field tests

Early field trials using steady direct current (DC) power in soft carbonate formations boosted fluid production by 30 percent, but hard igneous rock barely flinched. Energy solvers realized that only rapid, high-voltage pulsed bursts could generate the required shock waves.

In 2025 field tests inside an abandoned Colorado mine, pulsed power successfully fractured hard igneous rock, boosting permeability tenfold.

Subsequent tests on fractured rock samples in the lab produced up to four times more hydrogen than untreated stone.

Now, tests on a Massachusetts horse farm are refining the process, requiring about 100 pulses to fracture through 33 feet of hard rock while drawing roughly as much power as a household toaster.

A crowded field of competing ideas

American innovators are tackling the problem from multiple angles.

Houston-based GeoKiln relies on underground heating systems to warm rock formations to 390–570 °F, accelerating natural reaction rates where permeability already exists. Another Houston firm, Vema Hydrogen, injects heated water combined with proprietary catalysts into semi-permeable stone.

In Denver, Koloma uses carbon dioxide to create a mild acid that chemically “micro-pits” rock pore surfaces, expanding the iron area exposed to water.

Texas A&M University energy researcher Rita Okoroafor notes that a single approach won’t suffice. Her models show that commercial production will require combining electrical fracturing, chemical catalysts, and periodic restimulation to clear mineral clogging and maintain gas flow.

The road to commercial hydrogen—and the unknowns ahead

Massive hurdles remain before geologic hydrogen reaches American homes and factories.

Gas purification, storage, U.S. regulatory approvals, and environmental safeguards regarding groundwater and seismic activity must all be resolved before full-scale commercialization. Yet the potential is staggering—and one team is bringing all these elements together in a dramatic trial.

On a quiet Massachusetts horse farm, a Boston startup is testing underground lightning strikes to turn ancient rock into a hydrogen factory using machines named Zeus and Thor. Eden GeoPower lowered massive electrodes deep into the earth, using custom Marx generators named after thunder gods to fire shockwaves through bedrock.

If these trials succeed, artificial lightning may finally unleash Earth’s ultimate clean fuel factory.

Kelly Lippke

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.