Terrestrial Energy Completes 2026 NRC Report Guidance

The Tip Desk · November 12, 2026 · 3 min read

The company closed the quarter with $276.3 million in cash and short-term investments after $7.1 million of cash burn.

Terrestrial Energy Inc. (IMSR), a developer of Generation IV molten salt nuclear plants, submitted its Graphite Topical Report to the U.S. Nuclear Regulatory Commission and, after quarter-end, the Thermal and Electric Facility Topical Report, completing its 2026 guidance of at least three topical-report submissions.

The Graphite report seeks approval of the company’s methodology to qualify graphite for the IMSR Core-unit. The TEF report, filed after the close of the third quarter ended September 30, 2026, seeks NRC confirmation that the thermal and electric facility is a non-nuclear part of the IMSR plant that can be constructed and operated without NRC permits or licenses. Chief Executive Officer Simon Irish said the TEF submission delivered on that three-report guidance.

The selection also extended the commercial pipeline into federal and defense work. Terrestrial Energy was named the advanced nuclear technology supplier for Ameresco, Inc.’s power project at the U.S. Army’s Aberdeen Proving Ground in Maryland, the second IMSR plant project the company has disclosed this year. The Army selected Ameresco through a competitive process under its Strategic Capital Initiatives program, building on a June 2025 memorandum of understanding. The company said the pick is in line with year-start guidance to announce details on one to three additional projects.

Net loss widened to $11.0 million from $9.4 million in the second quarter 2026. The company said the change was primarily driven by a $0.9 million increase in research and development, including fuel testing and lease costs related to RELLIS, and a $0.5 million increase in general and administrative expense from stock-based compensation on awards to new hires.

Cash burn rose to $7.1 million, an increase of $0.7 million versus the second quarter, largely reflecting higher R&D activity associated with fuel development and testing. Cash and cash equivalents plus short-term investments declined to $276.3 million from $283.4 million at second-quarter end. Total liabilities were $8.6 million, with no debt. The company said it expects cash burn to increase as it ramps projects in future quarters, including TETRA and TEFLA.

Engineering work with Zachry Nuclear commenced under the Engineering Services Agreement, supporting site characterization and NRC Construction Permit application work at the Texas A&M-RELLIS site. The company also developed fuel, component and services supply for those two Department of Energy partnership projects. After quarter-end, Terrestrial Energy appointed David Williams as Chief Commercial Officer, effective October 19, 2026.

Shares issued and outstanding were unchanged at 105.9 million, consisting of 82.7 million common shares and 23.2 million exchangeable shares. Subsequent to quarter-end, the company authorized a share repurchase program of up to $25 million of common stock, funded with existing cash on hand.

In the prior quarter, Terrestrial Energy had raised its estimated cumulative lifetime revenue per IMSR plant to $2.7 billion from $2.1 billion on a 33% blended gross margin, with Core-unit and Fuel Salt supply margins estimated at 33% and 40%, and lifted its 2050 serviceable addressable market to $2.3 trillion.