Deep beneath northern Ontario, billion-year-old rocks are quietly generating hydrogen gas. Scientists have measured this natural flow for the first time, and the numbers are surprising. A single mine site near Timmins could produce enough clean energy each year to power more than 400 homes.
Hydrogen seeping from mine boreholes for a decade or more
Researchers from the University of Toronto and the University of Ottawa drilled into the Canadian Shield, one of the oldest rock formations on Earth. At an active mine near Timmins, Ontario, they found that boreholes release an average of 8 kilograms of hydrogen per year. That is roughly the weight of a car battery. The gas keeps flowing for at least ten years.
Across the mine's nearly 15,000 boreholes, the total hydrogen output exceeds 140 tonnes annually. The team calculated that this amount could generate about 4.7 million kilowatts of energy per year from just one location. That is enough to meet the yearly energy needs of more than 400 homes.
A potential energy source hidden in plain sight
This naturally occurring hydrogen is called white hydrogen. It forms inside Earth's crust and escapes through fractures in ancient rock. Until now, scientists had not directly measured how it accumulates and discharges over time. The study, published in the Proceedings of the National Academy of Sciences, provides the first continuous long-term measurements underground.
The researchers tracked how the gas builds up and mapped where it concentrates. This new strategy for hydrogen exploration could help determine whether white hydrogen can become a practical and economical energy source.
Why local communities and industries care
Hydrogen is already a major part of the global economy, valued at roughly $135 billion. It is essential for fertilizer manufacturing, which supports agriculture and global food production. Hydrogen is also used in methanol production and steelmaking.
Today, most hydrogen is produced through industrial methods that rely on fossil fuels such as petroleum, natural gas, and coal. Those processes require large amounts of energy and release carbon emissions. White hydrogen offers a different path. It comes from the ground naturally, with no fossil fuel inputs.
For remote communities in northern Ontario, this could mean access to a domestic source of cost-effective energy. For local and regional industry hubs, it could reduce dependence on imported hydrocarbon fuels.
What the discovery means going forward
The findings suggest that Earth's oldest rocks may hold significant untapped sources of clean energy. The study introduces a new way to explore for natural hydrogen, which could support efforts to reduce greenhouse gas emissions and expand clean energy options. The data points to critical opportunities that have not yet been accessed.
