Japan’s post-ISS plan envisages the Japan Aerospace Exploration Agency purchasing services on commercial space stations to continue research and technology demonstrations in low Earth orbit. A November 4 ministry briefing sets out that approach alongside developments in NASA’s procurement of privately owned orbital destinations.
The Ministry of Education, Culture, Sports, Science and Technology, known as MEXT, presents a model in which Japanese companies participate in stations led by American businesses and provide utilization services. JAXA would procure those services for national activities. The framework also aims to bring companies and universities with limited space experience into orbital research.
The briefing follows up Japan’s August 2025 policy report. It connects the future service model with current responsibilities: operating the Japanese Experiment Module, Kibo, developing and operating HTV-X cargo spacecraft, and supporting astronaut activities. Japan’s Space Strategy Fund is supporting private-sector preparations, including cargo transportation and recovery concepts and a Japanese commercial module.
NASA’s Procurement Sets the Commercial Context
NASA’s October 9 solicitation announcement describes an acquisition covering both destinations and transportation. Companies are invited to design, build, test, certify and operate facilities that provide complete human-spaceflight services. Proposals are due December 8, 2026, with contract awards expected in spring 2027.
The agency plans firm-fixed-price contracts under an indefinite-delivery, indefinite-quantity arrangement. In practical terms, this establishes a contract structure under which defined work can be ordered as the program progresses. NASA expects to select two or more contractors for early development, followed by a competitive task order covering final design, testing, evaluation, certification and services from one or more providers.
NASA identifies research, technology development, crew training and preparations for lunar and Mars missions as continuing uses of low Earth orbit. These are activities that require an orbital destination and the transportation needed to reach it. Japan’s planned purchasing role places its national research activities within the same emerging market for station access and supporting services.
Kibo Provides Existing Research Services
JAXA’s Kibo utilization strategy provides a concrete account of the work associated with station access. Its fourth edition, issued in March 2024, incorporates Japan’s participation in ISS operations through 2030. It identifies a 2028–2030 transition period within a longer-term vision for low Earth orbit utilization around 2035.
The strategy organizes existing work into research platforms. Protein crystal growth supports the study of three-dimensional protein structures for drug-design research. Small-animal studies examine biological responses to space conditions and different gravity levels. Materials research includes containerless processing, in which samples can be studied without contact with a conventional container.
These activities explain the practical meaning of purchasing station services. An experiment combines a research instrument or sample with supporting resources, operating procedures and access to results. The laboratory’s contribution includes the environment in which the experiment runs and the facilities that allow researchers on Earth to use it. Japan’s transition planning builds on this established organization of orbital research.
Kibo also supports experiments outside the pressurized laboratory. JAXA’s exposed-facility services use an airlock and robotic arm to transfer equipment from the interior to external experiment locations. This arrangement allows equipment to be prepared inside before being moved into the space environment.
The small exposed experiment platform supplies electricity, commands and telemetry to multiple payloads. Users develop their mission equipment, which connects to these shared resources. Research data return to Earth, and samples or devices can also be returned when required by the experiment. Another mechanism mounts material samples outside Kibo for exposure to space conditions.
The same combination of airlock and robotic handling supports small-satellite deployment. Kibo’s dedicated deployer carries CubeSat-format spacecraft from the station interior and releases them into orbit. Research equipment, exposed samples and deployable satellites are different payloads, but each uses station infrastructure to complete a defined activity for an external user.
Cargo Transportation Supports Orbital Work
JAXA’s HTV-X specifications show how transportation connects with these activities. The uncrewed spacecraft carries equipment and supplies to the ISS and can subsequently serve as a platform for technology demonstrations. Its standard specifications allow up to six months attached to the station and up to 18 months of operation after departure; individual missions can differ.
The design concentrates propulsion and electrical functions in a service module. A pressurized cargo module carries supplies and equipment for use inside the station, and an exposed cargo area accommodates equipment outside that pressurized volume. JAXA lists a standard launch mass of approximately 16 metric tons, including propellant, spacecraft structure and payload.
The published comparison with the earlier HTV gives cargo capacity as 5.85 metric tons, compared with four metric tons, and cargo volume as 78 cubic meters, compared with 49 cubic meters. HTV-X also supports electrical power for cargo and later loading of selected supplies before launch. These functions support the delivery and operation of research equipment as Japan prepares to procure orbital services beyond the ISS.
