The quest for hydrogen sources has taken a groundbreaking turn, with researchers exploring the potential of naturally occurring hydrogen gas hidden beneath the Earth’s surface. Hydrogen is increasingly recognized as a sustainable fuel option, with applications ranging from transportation and aviation to steel production. Its appeal lies in its clean combustion, which produces only water and oxygen, eliminating carbon emissions associated with traditional fossil fuels.
Historically, hydrogen production has relied heavily on fossil fuels, particularly natural gas, primarily for use in petroleum refining and chemical manufacturing. However, the climate crisis has prompted a shift towards cleaner production methods. Traditionally, the competition for clean hydrogen revolved around electrolyzers powered by renewable energy versus fossil fuel-based systems enhanced with carbon capture technology. Unfortunately, both approaches have faced challenges, primarily due to high costs. Recently, a new avenue has emerged: geological hydrogen, with companies discovering natural hydrogen deposits across various continents, including Africa, Asia, Europe, Australia, and North America.
The U.S. Geological Survey has identified promising regions in the United States, notably the Midcontinent Rift, which stretches from Kansas to Michigan. This area, shaped by geological activity over a billion years ago, possesses iron-rich rocks that can react with water to produce hydrogen. Companies like HyTerra, based in Australia, are actively exploring hydrogen potential in Nebraska and Kansas, having already recorded hydrogen concentrations as high as 96%. Meanwhile, Koloma, a leading firm in the sector with over $400 million in funding, is also prospecting in these regions.
Despite the promise of natural hydrogen, challenges remain regarding the volume of hydrogen produced and its effective capture. Hydrogen’s lightweight nature allows it to escape through tiny fissures in rock formations. Research shows that boreholes in a northern Ontario mine released around eight kilograms of hydrogen annually, suggesting significant potential for capturing this resource, especially given the large number of boreholes available at the site.
Some companies are taking a proactive approach by enhancing hydrogen production through stimulated geologic processes. Vema Hydrogen, based in Texas, is exploring methods to induce hydrogen production by drilling wells and injecting water along with catalysts to facilitate reactions. The company is currently testing its techniques in Quebec, aiming for full-scale production by 2028. Other innovators, like Eden GeoPower, are employing electricity to create fracture networks in rocks, which could also benefit geothermal energy projects.
Despite the advancements, significant challenges remain in hydrogen storage and transportation, which require substantial space or extremely low temperatures to liquefy the gas. However, if these engineering hurdles can be overcome, the exploration of underground hydrogen could herald a transformative era for sustainable energy production.
Source: The next big thing in hydrogen could be underground via MIT Technology Review