BY TETSUJI TOMITA
Natural hydrogen, also known as white hydrogen or geologic hydrogen, has become one of the more intriguing prospects in the energy transition.
Its appeal is easy to understand. Unlike green hydrogen, it does not need to be produced with large volumes of renewable electricity. Unlike blue hydrogen, it does not depend on fossil-fuel reforming and carbon capture. If it can be extracted at scale from underground reservoirs, it could offer a low-carbon fuel with fewer production steps than today’s main hydrogen pathways.
That possibility has drawn interest from a growing number of countries, including Japan. Natural hydrogen is generated by geological processes and, in theory, can be recovered in a way closer to oil or natural gas extraction than to industrial hydrogen production.
The attraction is considerable. A commercially viable natural-hydrogen resource could lower costs, reduce pressure on power systems and provide another route to decarbonizing hard-to-abate sectors such as steel, chemicals and heavy transport.
But there are a number of uncertainties around this theoretical Holy Grail of clean energy resources. It is not yet clear where natural hydrogen can be found in commercially useful volumes, how quickly reservoirs regenerate, how extraction should be regulated, or whether projects can be profitable outside a few favourable geological settings.
Natural hydrogen may therefore be best seen not as a ready-made answer to the hydrogen economy’s problems, but as a high-potential resource still searching for proof. If proponents are right, it could become a valuable new energy source. And if not, it may remain another promising technology whose geology, economics and engineering fail to align.