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NASA and the U.S. Department of Energy say they aim to have a fission reactor ready for a lunar launch by 2030. The American power target has also grown: NASA’s earlier concept work studied a 40-kilowatt-electric system, while its 2025 industry update described a goal of at least 100 kWe for long-term human operations. China and Russia have a documented joint plan for the International Lunar Research Station, but the station’s published schedule is not itself confirmation of a reactor deployment date. The competition is real, but the public plans are not yet like-for-like.
What the competing lunar plans actually say
| Program | Publicly stated plan | Power or reactor target | What the schedule establishes |
|---|---|---|---|
| United States: NASA and DOE | Develop, fuel, authorize and ready a lunar surface reactor, in support of Artemis and possible future Mars missions. | NASA’s 2025 industry update describes at least 100 kWe using closed Brayton-cycle power conversion. Earlier Phase 1 studies specified a 40-kWe-class concept; DOE’s January 2026 explainer says a 40-kWe demonstration could power part of lunar surface infrastructure. | NASA and DOE announced a goal of readiness for launch by 2030. NASA’s 2025 industry update described an intent to put a reactor on the Moon by the first quarter of fiscal year 2030. |
| China and Russia: International Lunar Research Station (ILRS) | A long-term, autonomous scientific facility on the lunar surface and/or in orbit, open to international partners; CNSA describes a basic station and a later expanded phase. | The reviewed CNSA station material does not specify a reactor output or deployment date. NASA’s August 2025 directive says China and Russia had announced a joint reactor effort targeting the mid-2030s. | CNSA describes a basic station planned by 2035 and an expanded phase by 2045. Those are station milestones, not independently confirmed reactor milestones. |
The dates describe goals, not completed deployments. NASA’s January 13, 2026 announcement says the agencies intend to develop and ready the system for launch; it does not say a reactor has been built, launched or installed. The more specific first-quarter FY2030 target appeared in NASA’s 2025 industry update. In the U.S. federal calendar, that quarter runs from October through December 2029, but a target date is not evidence that the schedule will be met.
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The China–Russia distinction matters too. Their 2021 joint statement established the ILRS as a cooperative station concept, and CNSA’s 2025 account laid out station phases. The specific mid-2030s reactor target is reported in NASA’s 2025 directive; it is not given in the CNSA station schedule described here. A station plan and a reactor plan should not be treated as interchangeable.
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Why put a nuclear reactor on the Moon?
A fission surface power system splits uranium atoms to produce heat, then converts that heat into electricity. Unlike solar panels, a fission system can provide power without depending on direct sunlight. That makes it attractive for continuous loads such as habitat systems, rovers, scientific equipment and resource-use operations, including in locations or periods when solar generation is inadequate.
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Lunar nights last about 14 Earth days, though the exact duration and illumination conditions vary by location. A power source that can operate through darkness could reduce the need to rely solely on stored solar energy for long-duration activity. DOE identifies sustained power at the lunar south pole as a mission need because solar supply may not be sufficient in all places or for all extended operations.
Fission is not automatically the best answer for every lunar mission: it is a complex system that must be launched, landed, shielded, cooled and operated safely. Its potential advantage is steady output independent of sunlight, particularly as surface operations become longer and more power-intensive.
How the U.S. power target changed
The earlier 40-kWe concept
NASA’s Phase 1 concept requirements called for 40 kilowatts of electrical output, a mass below six metric tons and a goal of operating autonomously for a decade. Those were design targets for an earlier concept, not proof of a finished reactor. DOE’s January 2026 explainer also describes a 40-kWe demonstration as capable of powering a portion of lunar infrastructure and equipment.
The later 100-kWe goal
NASA’s August 2025 directive said industry feedback pointed to a need for at least 100 kWe for long-term human operations, including in-situ resource utilization. NASA’s subsequent industry update described a system at that power level using closed Brayton-cycle conversion. The increase reflects a higher stated need for sustained human operations; it does not mean that NASA has publicly selected a final design or that the earlier 40-kWe study has become a deployed system.
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NASA’s January 2026 release describes a multi-year system intended to operate without refueling. That is a design ambition for the program, not an achieved operating record on the Moon. NASA’s project overview frames the work as Fission Surface Power, drawing on government and private-industry capabilities to provide reliable electricity independent of lunar location.
What NASA and DOE have announced—and what remains to be done
On January 13, 2026, NASA and DOE announced renewed collaboration on lunar fission surface power. NASA said the agencies intend to develop, fuel, authorize and ready a reactor for launch by 2030. The announcement connects the effort to Artemis and possible future Mars missions, but the near-term subject is a lunar surface power system.
NASA’s 2025 procurement activity sought industry feedback and refined the system concept and its Artemis compatibility information. The later public description identifies closed Brayton-cycle conversion for the at-least-100-kWe target. This is a program moving through requirements and industry engagement, not a contest in which two finished U.S. reactor designs have been publicly compared head to head. NASA’s technical-trade work covers reactor and shielding, conversion, heat rejection, power management and distribution, and integration with the mission.
The 2025 directive also said the FY2026 President’s Budget Request included $350 million for a new Mars Technology program, rising to $500 million beginning in FY2027. Those are requested budget amounts, not confirmed appropriations or evidence that those sums have been spent on a lunar reactor. The same directive reported that NASA had invested more than $200 million in Fission Surface Power technologies since 2000.
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China and Russia’s lunar station plan
The 2021 CNSA–Roscosmos joint statement describes the International Lunar Research Station as a multipurpose scientific research facility on the lunar surface and/or in orbit. It envisions long-term autonomous operation, possible human presence and participation by international partners.
CNSA’s April 2025 description places a basic ILRS model in the lunar south-pole region by 2035 and an expanded phase by 2045. Its account includes surface and orbital facilities and capabilities such as energy supply, communications, navigation, transport, research and ground support. These elements describe a broad infrastructure program. They do not, by themselves, establish that a reactor has been selected, define its power output or confirm when one would reach the Moon.
NASA’s 2025 directive says China and Russia announced on at least three occasions since March 2024 a joint effort to put a reactor on the Moon by the mid-2030s. That is a reported plan attributed to NASA’s directive. It should not be conflated with CNSA’s separately published 2035 basic-station target, even though the timelines overlap.
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Getting electricity from a fission system on Earth is not the same as delivering a reliable power plant to the lunar surface. NASA and DOE identify challenges across the reactor, spacecraft journey, surface environment and mission interfaces.
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- Autonomous operation: The earlier Phase 1 concept sought a decade of operation without human intervention. A system may need to run reliably before crews arrive or in locations where frequent maintenance is impractical.
- Radiation and shielding: Designers must limit radiation dose and protect crews, equipment and nearby systems while managing the added mass and geometry of shielding.
- Heat rejection: The reactor and conversion equipment generate heat that must be managed in an environment unlike Earth’s atmosphere. NASA’s design trades include heat rejection alongside electrical conversion and distribution.
- Surviving launch and landing: DOE identifies the need for structural robustness through launch and landing vibration, while protecting the core, coolant and electronics.
- Extreme temperatures and site conditions: The system must function across lunar temperature extremes and suit the selected site’s illumination, terrain and mission layout.
- Integration and delivery: The reactor must fit within a launch and landing system, connect to surface power distribution and align with Artemis or other mission plans. NASA has identified Artemis compatibility as part of its industry engagement.
These are interconnected trade-offs. More output can support more equipment and activity, but higher power requirements affect conversion, heat management, shielding, mass and mission integration. The publicly described targets establish the scale of the ambition; they do not settle those design choices.
What the historical record does—and does not—show
The United States has previously flown a space fission system. DOE says SNAP-10A, launched in April 1965, produced 500 watts and operated for 43 days in a flight test. That is a useful proof that a reactor has operated in space, but it is not a demonstration of a 40- or 100-kWe lunar surface plant, nor evidence of long-duration operation on the Moon.
The present effort faces a different combination of power scale, duration, landing conditions, radiation management and surface infrastructure needs. A historical spaceflight test and current lunar development targets answer different questions: one records a past flight, while the other sets goals for future systems still under development.
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A reactor announcement is only one milestone in a much longer chain. Progress is better assessed by asking what has been demonstrated, selected and funded than by comparing headline dates alone.
- Power target: Is the figure an early concept, a demonstration system or the later target for long-duration human operations?
- Conversion architecture: Has a power-conversion approach been described, and has a final design been selected?
- Operating duration and autonomy: Is the number a design goal, a tested result or an on-Moon operating record?
- Safety and mission readiness: Are shielding, radiation dose, launch and landing robustness, heat rejection and power distribution addressed in an integrated system?
- Procurement and funding: Has a target moved from directive or budget request into funded procurement and hardware development?
- Schedule specificity: Does a date refer to station construction, reactor delivery, launch readiness, launch or actual operation on the lunar surface?
On the public record described here, the U.S. has a defined power-development effort and a 2030 target, while the China–Russia partnership has a defined station framework and a reactor date reported by NASA. Neither the date nor the broad station ambition should be mistaken for a reactor already operating on the Moon.
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