NASA wants to put nuclear reactors on the moon

At a glance:

• NASA aims to launch a medium‑power nuclear reactor to orbit by 2028 and a large reactor on the lunar surface by 2030.
• Reactors must generate at least 20 kWe for three years in space and five years on the Moon, with scalability up to 100 kWe.
• The roadmap is a joint effort by NASA, the Pentagon and the DOE, driven by the White House OSTP to ensure U.S. space superiority.

What the roadmap details

The White House Office of Science and Technology Policy (OSTP) released a memorandum that lays out a multi‑agency space‑nuclear technology roadmap. The document calls for a medium‑power reactor placed in Earth orbit by 2028, with a variant capable of nuclear electric propulsion, and a first functional large‑scale reactor on the lunar surface by 2030. Both reactors are required to be modular and scalable, delivering a minimum of 20 kilowatts of electric power (kWe) for three years while in orbit and at least five years on the Moon, with designs that can be upgraded to 100 kWe.

The plan also tasks the Department of Energy (DOE) with providing the necessary fuel, infrastructure, and safety protocols. DOE will assess whether the private sector can produce up to four reactors within a five‑year window, ensuring that supply chains, testing facilities, and regulatory frameworks are in place. The first design concepts are expected within a year, giving contractors a clear timeline for prototype development.

Technical rationale and challenges

Current spacecraft rely almost exclusively on solar panels paired with bulky batteries, which are inefficient for deep‑space or long‑duration lunar missions where sunlight can be intermittent. Nuclear fission reactors, by contrast, can deliver continuous power for years without the mass penalty of large battery banks. This steady output not only supports habitat life‑support systems and scientific payloads but also enables nuclear electric propulsion, allowing spacecraft to travel farther with less chemical fuel.

Key engineering hurdles include radiation shielding, heat rejection in a vacuum, and the safe launch of fissile material. Modular designs are intended to mitigate risk by allowing individual units to be tested on the ground before assembly in orbit or on the lunar surface. Additionally, the roadmap emphasizes redundancy and fault‑tolerant architectures to meet NASA’s stringent safety standards for crewed missions.

Inter‑agency coordination and competition

The initiative represents a rare alignment of NASA, the Department of Defense (DoD), and the DOE, each bringing distinct expertise: NASA’s mission planning, DoD’s launch and security capabilities, and DOE’s nuclear technology know‑how. The memorandum encourages competition among contractors, a strategy intended to spur innovation while keeping costs in check. This collaborative model mirrors earlier programs such as the Space Launch System, but with a sharper focus on energy rather than propulsion alone.

Strategically, the roadmap is framed as a response to growing Chinese activity in lunar energy research. By establishing a robust U.S. nuclear‑powered presence on the Moon, the administration hopes to cement what OSTP describes as “U.S. space superiority” and secure a technological edge in future Mars and deep‑space endeavors.

Outlook and next steps

Within the next twelve months, NASA and its partners will solicit proposals from industry for the first reactor designs. Successful bidders will move to ground‑testing phases, after which flight‑qualified units could be integrated onto a launch vehicle slated for 2028. Parallel development of the lunar surface reactor will focus on landing mechanisms, autonomous deployment, and integration with upcoming Artemis habitat concepts.

If the timeline holds, the 2030 lunar reactor could power habitats, scientific labs, and possibly in‑situ resource extraction processes, dramatically expanding the scope of permanent lunar operations. Observers will be watching closely for budget allocations in the FY2025 appropriations bill, as funding will be the decisive factor in turning the roadmap from paper to reality.