NASA and the U.S. Department of Energy formally advanced a lunar fission surface power effort on January 13, 2026, following a 2025 directive that ordered a reactor delivering at least 100 kilowatts of electric power on the Moon by the first quarter of 2030. The program is reported to have evolved from earlier 40-kilowatt studies and now targets a reactor sized to support roughly 75 to 80 average U.S. homes worth of electricity output.
For the Lunar Ark, the technical significance is continuous baseload power at a scale sufficient for pressurized habitats, thermal control, communications, cryogenic preservation, ISRU processing, and backup systems during prolonged lunar darkness. A 100-kilowatt class reactor materially reduces dependence on batteries and fragile solar farms, and it creates a stepping stone to larger surface power systems and potentially nuclear propulsion infrastructure that could support logistics, redundancy, and evacuation capacity.
The Ark team should track the Fission Surface Power program, the 2030 launch-readiness schedule, the closed Brayton cycle power-conversion choice, and any down-selection to one or two reactor vendors. Priority research should focus on how to harden reactor-adjacent habitation, integrate waste heat for thermal management, design power-islanding for critical archives, and map how this reactor architecture could scale to multi-hundred-kilowatt or megawatt-class systems for permanent settlement.