Hydrogen Beneath Our Feet: Why Geologic Hydrogen Is Gaining Global Attention

For decades, hydrogen has been discussed primarily as an energy carrier—a fuel produced from other energy sources such as natural gas, water electrolysis, or biomass. But a growing body of scientific research is challenging that assumption.

What if hydrogen is not only something we manufacture—but something we can discover naturally within the Earth itself?

This question sits at the center of growing interest in geologic hydrogen, a naturally occurring form of hydrogen gas found beneath the Earth’s surface. As scientists, energy companies, and policymakers explore this emerging field, geologic hydrogen is increasingly being discussed as a potential new domestic energy resource.

What Is Geologic Hydrogen?

Geologic hydrogen—sometimes called natural hydrogen—refers to hydrogen gas that forms naturally through geological processes and becomes trapped within underground rock formations. Unlike conventional hydrogen production methods, which require energy input to separate hydrogen from other molecules, geologic hydrogen may be directly extracted from natural reservoirs in the Earth’s crust.

This distinction is significant. If recoverable at scale, geologic hydrogen would represent a primary energy resource, rather than simply an energy carrier derived from other fuels.

The implications of that shift could be profound.

How Hydrogen Forms Naturally

Scientists have identified several geological processes that can generate hydrogen within the Earth’s crust. Two of the most studied mechanisms are serpentinization and radiolysis.

Serpentinization occurs when water interacts with iron-rich rocks such as olivine and pyroxene, producing hydrogen gas through chemical reactions. Radiolysis occurs when natural radiation emitted from radioactive elements splits water molecules, releasing hydrogen as a byproduct.

Over geological timescales, these processes may allow hydrogen to accumulate within underground reservoirs in a manner similar to natural gas.

Why Interest Is Growing

Interest in geologic hydrogen has accelerated rapidly in recent years as researchers estimate that trillions of tons of natural hydrogen may exist globally beneath the Earth’s surface. Even recovering a small portion of this resource could theoretically supply hydrogen demand for generations.

This possibility has sparked exploration efforts across several continents, including North America, Europe, and Australia. Governments and private companies alike are beginning to study where geologic hydrogen resources may exist and how they could potentially be developed.

In the United States, early geological research and mapping efforts are helping scientists identify regions where conditions may be favorable for hydrogen accumulation.

A New Area of Energy Exploration

Despite the excitement surrounding geologic hydrogen, the field remains in its early stages.

Much of what we know about natural hydrogen deposits has come from accidental discoveries rather than systematic exploration. Understanding where hydrogen accumulates, how it migrates underground, and how it can be safely extracted will require significant research and collaboration across industry, academia, and government.

Still, the growing momentum around geologic hydrogen reflects a broader reality: the hydrogen economy will likely be built from multiple production pathways and technological innovations working together.

As interest in hydrogen continues to grow worldwide, geologic hydrogen may become one of the most intriguing frontiers in the evolving global energy landscape.