NASA Advances Fission Reactor for SR-1 Freedom Mission
The Cleveland-based project moves forward with new contracts to power future deep space exploration missions.
Updated on Oct. 20, 2026 in Nuclear
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NASA has initiated contract actions for the SR-1 Freedom nuclear power module, a fission-powered spacecraft designed for travel beyond Earth orbit. The project, managed at the NASA Glenn Research Center, aims to test nuclear electric propulsion for future exploration.
Why it matters
These contract actions are designed to reduce technical risk and maintain development momentum toward the scheduled 2028 launch. The mission will evaluate how fission-powered systems can support future deep space exploration and lunar base power requirements.
The SkyFall science mission integrates three Mars helicopters into its payload. The project operates under the Space Flight Systems Development and Operations Contract III, which was initially awarded in 2024.
The players
NASA Glenn Research Center
Located in Cleveland, this facility serves as the lead site for the development and operations of the SR-1 Freedom project.
Sierra Lobo Inc.
This company is responsible for providing the closed Brayton cycle power conversion system used for the spacecraft.
Idaho National Laboratory
This facility is a Department of Energy national laboratory that leads the design and development of the fission reactor.
The details
Sierra Lobo Inc. will build the closed Brayton cycle power conversion system, which transforms thermal energy from a fission reactor into electricity. The Idaho National Laboratory is tasked with the design and development of the reactor, which is engineered to remain inactive until the craft departs Earth orbit.
Timeline
2024: The Space Flight Systems Development and Operations Contract III was awarded.
October 20, 2026: NASA announced new contract progress for the SR-1 Freedom mission.
Late 2028: The SR-1 Freedom mission is scheduled for launch.
The Big Picture
The SR-1 Freedom mission represents a critical application of the goals established by the Space Flight Systems Development and Operations Contract III. This initiative advances space technology by integrating nuclear electric propulsion into the agency's long-term exploration architecture.
Successful development of this reactor could provide a blueprint for stable, long-duration power sources needed for future lunar habitats. These advancements in nuclear electric propulsion are expected to significantly increase the range and payload capacity for future planetary missions.
The takeaway
The SR-1 Freedom mission marks a transition toward using fission reactors for deep space travel and base support. These systems aim to provide power during periods of darkness, which is essential for sustained operations on the lunar surface.
What happens next
The SR-1 Freedom mission is currently slated for launch in late 2028.
Further reading
Learn more about the future of energy in space in the Nuclear section.
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Should the federal government invest in developing experimental nuclear power systems for future space exploration?
