US Sets 2030‑2031 Targets for Space Nuclear Reactors

**TL;DR:** The United States plans to place a nuclear reactor in Earth orbit by 2031 and deliver a 20‑kilowatt fission unit to the Moon by 2030. This push follows a White House directive to lead global space nuclear power development.

**Context** The White House released National Security and Technology Memorandum‑3 in April 2026, establishing the National Initiative for American Space Nuclear Power. The memo orders NASA, the Department of Defense, and the Department of Energy to cooperate on reactor design, testing, and deployment. It builds on the historic SNAP program of the 1960s, which launched the first U.S. space fission system. The initiative also directs agencies to share test facilities and reuse reactor designs to cut duplication and speed deployment.

**Key Facts** The initiative calls for an orbital reactor demonstration by 2031, intended to power satellites and support in‑space manufacturing. A lunar surface fission system capable of at least 20 kilowatts electric is slated for delivery by 2030; after a three‑year checkout in orbit it will operate for five years on the Moon. The program also includes a design competition for low‑, mid‑, and high‑power reactors to spur innovation across the industrial base.

**What It Means** Reliable nuclear power would let spacecraft operate continuously during lunar night or deep‑space eclipses, where solar panels produce little or no electricity. It could enable sustained habitats, mining operations, and high‑data‑rate communications on the Moon and beyond. Private companies stand to gain contracts for reactor fabrication, fuel supply, and ground‑support services under fixed‑price arrangements. Defense planners see the technology as a way to power surveillance satellites and maneuverable spacecraft without reliance on solar arrays. Analysts note that China and Russia are advancing their own space nuclear programs, making the U.S. timeline a strategic race.

**What to watch next** Watch for the first ground‑based test of the orbital reactor prototype in 2028 and the lunar demo launch scheduled for 2029.