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Projects / prj-ameresco-imsr-aberdeen

Ameresco–Terrestrial Energy IMSR at Aberdeen Proving Ground

On 21 September 2026 Ameresco said the U.S. Army had competitively selected it to negotiate a long-term enhanced-use lease for commercial power generation at Aberdeen Proving Ground, Maryland, and that it is collaborating with Terrestrial Energy to deploy an integrated molten salt reactor (IMSR) at the campus's Phase 2 site.

Current status

Stage
Announced
Permissions
No project-specific permission or application is recorded here. This is not a finding that none exists.
Latest development
Announced 21 Sep 2026 · Announcement: Ameresco picked to negotiate Aberdeen Proving Ground power lease, with an IMSR planned. The Army selected Ameresco to negotiate a long-term lease for a power campus at Aberdeen Proving Ground in Maryland. Ameresco says it is working with Terrestrial Energy on an IMSR for the campus's Phase 2 site. The lease is still under negotiation; this is not a licence application, permit or construction start. Source: Ameresco: Ameresco Selected for U.S. Army Strategic Capital Initiatives to Advance Energy Resilience at Aberdeen Proving Ground and Picatinny Arsenal (published 21 Sep 2026); World Nuclear News: Latest Terrestrial Energy topical report submission could lead to faster deployment (published 9 Oct 2026). Updates entry
Next documented step
No next milestone date is recorded.
Important unknowns
  • Electrical output is not recorded.
  • Thermal output is not recorded on this project.
  • No operator is recorded.
  • No map pin is shown for this record.

Record reviewed 2026-10-18. This is a record review date, not proof of current activity. An announcement records the announcement, not necessarily the physical step it describes.

Description

Ameresco describes a phased campus potentially including natural-gas and advanced nuclear generation, subject to final agreements and required approvals. The lease is still under negotiation and Ameresco says no construction will begin before environmental and regulatory reviews. No output, unit count, schedule, NRC application or licensed operator is named; the Army is the host installation, not the operator.

View on map and table · Timeline · Permissions and applications · Sources and check dates

Key facts

Design
IMSR (Integral Molten Salt Reactor) (SMR)
Technology
Molten salt reactor (MSR) · molten salt
Operator(s)
Not recorded
Vendor for linked design
Terrestrial Energy
Other documented relationships
Location
Aberdeen Proving Ground (Phase 2 site) · United States · precision: named site, no coordinate recorded
U.S. Army installation named for the proposed power campus; the leased parcel is not identified, so no map point is set.
Coordinates
named site / not plotted
Electrical capacity
Not recorded · scope: plant
Thermal capacity
Not recorded
Modules planned
—
Inclusion basis
smr_by_design_class
Confidence
medium
Record reviewed
2026-10-18 (record review date)
Site and capacity notes

Ameresco–Terrestrial Energy IMSR at Aberdeen Proving Ground is recorded at Aberdeen Proving Ground (Phase 2 site), Maryland, United States. Operator: No operator is recorded. Recorded vendor: Terrestrial Energy. Stage: Announced. Location precision: named site, no coordinate recorded. Other documented relationships: Project proposer: Ameresco; Site host: U.S. Army.

Electrical output is not recorded on this project. Module count is not recorded. Thermal output is not recorded on this project.

Timeline

Recorded developments

Permissions and applications

Selected jurisdiction context

Browse related records by location. A jurisdiction measure does not by itself approve this project, and location alone does not establish eligibility for funding or support.

Evidence and open questions

Sources