Stored within unassuming beer kegs at Lancaster University lies a cache of helium-3, a substance so rare it retails for approximately $2,000 per liter. While these stockpiles were acquired decades ago when the isotope was relatively inexpensive, contemporary demand is surging. Helium-3 is indispensable for the cryogenic cooling required by quantum computers and holds immense promise as a fuel for future nuclear fusion reactors, which could theoretically provide nearly limitless clean energy.
Currently, the primary supply is a byproduct of the decay of tritium in nuclear warheads, a source both heavily regulated and insufficient for projected future needs. Consequently, entrepreneurs are pivoting toward the lunar surface. Analysis of regolith samples retrieved during the Apollo missions suggests that the Moon could serve as a repository for helium-3 deposited by solar winds over billions of years.
Interlune, a Seattle-based startup, is spearheading efforts to capitalize on this lunar bounty. The venture is notable for its leadership, including Harrison Schmitt, the Apollo 17 astronaut who has long advocated for lunar mining. Interlune intends to deploy autonomous excavators to the Moon by late 2027 to process vast quantities of regolith through automated heating and extraction.
However, the feasibility of this mountain-moving endeavor remains a subject of intense scrutiny among the scientific community. Critics argue that our understanding of lunar helium-3 concentrations might be skewed by atmospheric loss in retrieved samples. Furthermore, the logistical complexity of processing hundreds of thousands of tons of regolith to obtain a single kilogram of the isotope presents a formidable barrier.
Whether the economic projections for such a mission are genuinely viable remains proprietary information. Alternative perspectives suggest that the Earth's crust may still harbor untapped reserves. Pulsar Helium, for instance, is exploring terrestrial sites in Minnesota where concentrations of the isotope have been detected.
Proponents of this approach argue that conventional drilling is vastly more pragmatic than extraterrestrial logistics. Nevertheless, with a Finnish quantum firm recently committing $300 million to a future lunar supply, the race to secure this critical isotope is undeniably intensifying.