A proposed power project at the U.S. Army's Aberdeen Proving Ground has named Terrestrial Energy's Integral Molten Salt Reactor, or IMSR, as its advanced nuclear component. The September 21 supplier announcement turns the Army's earlier, technology-neutral lease award into a site-specific reactor choice, although no reactor authorization or construction has begun.
The Army conditionally selected Ameresco on September 18 to develop commercial generation at Aberdeen in Maryland and Picatinny Arsenal in New Jersey. Terrestrial Energy's new announcement applies to the Aberdeen proposal, where Ameresco plans a phased combination of natural gas and advanced nuclear generation. Under the Army's solicitation, a project would normally sell power to the regional grid but must be able to supply its host installation as an electrical island for at least 14 days after a grid outage lasting more than four hours.
IMSR is a liquid-fuel reactor design in which uranium fuel is carried in molten fluoride salt that also transports heat. Terrestrial Energy says its reference plant operates at high temperature and near-atmospheric pressure, uses standard-assay low-enriched uranium below 5% uranium-235, and can produce 390 megawatts of net electricity or a mix of power and industrial heat. That is the vendor's standard design envelope, not a disclosed capacity commitment for Aberdeen.
The supplier choice matters because it identifies the reactor, developer and potential host installation in one project. It does not amount to an order for an operating plant. The Army's model places financing, design, construction, operation and eventual decommissioning on the private developer, while the installation supplies land through a long-term lease. Neither announcement gives the Aberdeen site's final capacity, plant layout, construction sequence, electricity buyer or financing terms.
The award also remains conditional. The Army says formal lease agreements are only beginning and no construction can start before environmental review under the National Environmental Policy Act, Clean Air Act and Clean Water Act, along with all required federal, state and local permits. Terrestrial Energy is still preparing for U.S. Nuclear Regulatory Commission licensing and describes its first commercial plants as an early-2030s goal.
Sources
- Terrestrial Energy: Ameresco and Terrestrial Energy to deliver IMSR advanced nuclear power to Aberdeen Proving Ground
- U.S. Army: conditional lease solicitation awards for commercial power generation
- U.S. Army: Strategic Capital Initiatives energy-resilience solicitation
- Lead image: IMSR reactor building cutaway by Terrestrial Energy Inc., licensed under CC BY-SA 4.0.