What Terrestrial Energy (IMSR) Said on Its Q3 Earnings Call

Key Points

• Cash burn increased to $7.1 million in Q3 from $6.4 million in Q2, leaving Terrestrial Energy with $276.3 million in cash and short-term investments. The company expects spending to rise as it advances its TETRA reactor and TEFLA fuel-production pilots; its board also authorized up to $25 million in share repurchases.
• The company is developing a natural gas bridge to supply power before its nuclear plants are complete and during nuclear outages. It says the concept could be operational in three to five years, but regulatory treatment is unresolved and it has not provided a cost estimate.
• Terrestrial Energy reported progress on regulatory and commercial efforts, including submitting its third 2026 topical report to the NRC and beginning site characterization at Texas A&M-RELLIS. It was also selected to supply advanced nuclear technology for an Ameresco project at Maryland’s Aberdeen Proving Ground.

Terrestrial Energy NASDAQ: IMSR said its third-quarter cash burn rose as it advanced fuel development and testing, while outlining a natural gas bridge concept intended to supply power before its planned nuclear plants are completed.

The company ended the quarter with $276.3 million in cash, cash equivalents and short-term investments, down from $283.4 million at the end of the second quarter. Cash burn increased to $7.1 million from $6.4 million, and Chief Financial Officer Brian Thrasher said spending is expected to rise in future quarters as the company ramps up its TETRA and TEFLA pilot projects.

After the quarter ended, the board authorized a share repurchase program of up to $25 million, funded from existing cash. Thrasher said the company had no debt but did not provide guidance on how long its cash would last.

Natural Gas Bridge Targets Earlier Power

Chief Executive Officer Simon Irish described the IMSR Natural Gas Bridge as an extension of the company’s Integral Molten Salt Reactor plant design. The concept would use a natural gas heater to supply thermal energy to the plant’s steam systems before its nuclear facility is completed and during nuclear operating outages.

The gas and nuclear systems would share steam generators, turbines and electric generators. Irish said that approach could improve capital efficiency and avoid supply constraints affecting large gas turbines used in combined-cycle natural gas plants.

Terrestrial Energy anticipates the bridge could be operational within three to five years. Irish said work by engineering firm Hatch Limited supported projections that it could deliver power two to three years sooner than a combined-cycle gas plant while remaining competitive on capital costs and the levelized cost of electricity. He declined to provide a numerical cost estimate.

The company also engaged Worley Limited after quarter end for preliminary thermal and process engineering. Irish said further engineering, procurement and component supply-chain work remains, and that a project developer, rather than Terrestrial Energy, would be expected to finance procurement and construction and own and operate the units.

The concept’s regulatory treatment remains unresolved. On October 8, Terrestrial Energy submitted a topical report asking the U.S. Nuclear Regulatory Commission to confirm that its Thermal and Electric Facility is a non-nuclear part of the plant that can be built and operated without NRC permits and licenses. Irish did not provide a timeline for an NRC decision.

Regulatory and Commercial Progress

During the quarter, the company submitted a graphite topical report to the NRC seeking approval of its methodology for qualifying graphite used in the reactor. Irish said the October submission was the company’s third topical report of 2026, meeting its guidance to submit at least three during the year.

Terrestrial Energy also began site characterization work with Zachry Nuclear at Texas A&M-RELLIS ahead of construction engineering and an NRC construction permit application for a planned commercial plant.

On September 21, the company announced its selection as the advanced nuclear technology supplier for Ameresco’s power project at the U.S. Army’s Aberdeen Proving Ground in Maryland. Irish said Terrestrial Energy has disclosed details of three of its 10 active commercial project discussions, including the Ameresco project and a previously announced relationship with Riot Platforms.

Pilot Projects and Spending

Terrestrial Energy’s TETRA pilot reactor and TEFLA fuel production line pilot are intended to generate data for applications to license commercial IMSR plants and a commercial-scale fuel salt production facility. The company established an agreement with Idaho National Laboratory covering support for TEFLA, fuel salt production for TETRA and development of a process for commercial scale-up.

Irish said the company remained in negotiations with key suppliers and declined to give project timelines or say when TEFLA would produce its first fuel. He said the base case is to fund both noncommercial pilot projects from the company’s balance sheet, although public-sector funding for one or both could be possible in 2027.

Third-quarter research and development expenses rose by approximately $900,000 from the prior quarter, driven by fuel testing and RELLIS lease costs. General and administrative expenses increased by approximately $500,000, which Thrasher attributed to stock-based compensation for new hires.

About Terrestrial Energy (NASDAQ:IMSR)

Terrestrial Energy Nasdaq: IMSR is a developer of Generation IV nuclear plants that use its proprietary Integral Molten Salt Reactor (IMSR). The IMSR captures the operating benefits of molten salt reactor technology in a plant design that prioritizes capital efficiency, cost reduction, versatility and functionality of nuclear energy supply.

IMSR plants are designed to be small and modular for distributed supply of low-cost, reliable, dispatchable, clean, high-temperature industrial heat and electricity, extending the application of nuclear energy beyond electric power markets to industrial applications such as petrochemical and chemical synthesis and data center operation.

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