The prospect of deploying nuclear power on the Moon has moved from speculative science to strategic priority, raising complex legal and geopolitical challenges for states and the corporations that support them. Both China and the United States are advancing plans to install lunar nuclear reactors within the next decade—developments that are forcing a reassessment of the legal norms governing off-Earth activity.

In April 2025, China announced plans to build a Moon-based nuclear power facility by 2035, to support its proposed International Lunar Research Station. NASA quickly responded, with Acting Administrator Sean Duffy indicating that the U.S. could launch a functioning reactor on the lunar surface as early as 2030. The Department of Energy and NASA have long collaborated on compact nuclear systems capable of supporting lunar or Martian bases, where solar power is inadequate during extended night cycles.

The legal framework that currently governs such endeavors—the Outer Space Treaty of 1967—contains prohibitions against national appropriation and military activity in space, but offers limited clarity on resource ownership. While the treaty forbids sovereign claims over celestial bodies, it does not directly regulate the extraction and commercial use of lunar materials. This gap has prompted divergent interpretations, particularly among nations investing heavily in lunar infrastructure.

One such interpretation is embedded in the Artemis Accords, a U.S.-led initiative that seeks to establish principles for civil space exploration. While promoting transparency and cooperation, the accords have been viewed by some as an attempt to create a parallel framework outside the UN’s consensus-driven approach—raising questions about their legal weight in the event of disputes over lunar activity.

From a risk perspective, deploying nuclear reactors in extraterrestrial environments introduces potential safety and environmental liabilities. Unlike satellites powered by radioisotope thermoelectric generators, surface reactors present more complex containment challenges. Multinational efforts to define risk-sharing and emergency protocols for space-based nuclear incidents remain nascent.

Strategically, the Moon is fast becoming a proxy for terrestrial power dynamics. As China and the U.S. expand their presence, other actors—including Russia, India, and the European Space Agency—are accelerating their own programs. Legal practitioners advising aerospace, defense, or energy-sector clients must track not only regulatory updates but the shifting geopolitical alliances that will shape commercial viability and legal risk in this emerging domain.

For an in-depth look at the interplay between policy, technology, and international law, Ars Technica’s coverage offers a technical and legal breakdown of the challenges facing lunar nuclear power. As legal uncertainty collides with geopolitical ambition, the Moon is becoming more than a destination—it is a jurisdiction in formation.