Terrestrial Energy Inc

Terrestrial Energy Inc. announced on October 8, 2026 that it has submitted its Thermal and Electric Facility Topical Report to the U.S. Nuclear Regulatory Commission. If approved, the TEF, which houses the generators, turbines, and steam supply systems of the Integral Molten Salt Reactor Plant, could be customized for each site and built and operated ahead of the plant's nuclear construction permit and operating license. The IMSR Plant is designed in two discrete parts: the Nuclear Facility, containing standardized and modular nuclear systems, and the TEF, containing non-nuclear heat transfer, steam supply and electric systems. With NRC approval, the TEF could enter commercial service ahead of the Nuclear Facility, using an auxiliary heat source such as natural gas as a bridge to nuclear power. The report asks the NRC to confirm that building the TEF is not nuclear construction under 10 CFR 50.10(a)(1), and it is the Company's third Topical Report submission of 2026, following NRC approval of its PIE and Principal Design Criteria Topical Reports in 2026 and 2025, respectively, and a September submission on graphite qualification methodology.

Terrestrial Energy Inc. reported a second-quarter net loss of $9.4 million on August 11, an improvement from its $10.5 million first-quarter loss, as the pre-revenue small modular reactor developer continued to fund a long development runway. The company raised its estimate of cumulative lifetime revenue per IMSR Plant to $2.7 billion from $2.1 billion, at a blended gross margin of 33%, and lifted its 2050 serviceable addressable market estimate to $2.3 trillion. The US Nuclear Regulatory Commission approved Terrestrial Energy's Postulated Initiating Events methodology Topical Report, following its earlier approval of the Principal Design Criteria Topical Report, and the company signed ground lease and research agreements with the Texas A&M University System covering 77 acres at the Texas A&M-RELLIS site, while bringing on Zachry Nuclear under an engineering service agreement. Terrestrial Energy also signed a memorandum of understanding with Riot Platforms Inc. to explore co-locating IMSR plants with Riot data centers, including a natural gas bridge for early power supply, and added Kathy McCarthy to its board and Pamela Cowan as EVP of Engineering. Cash burn came in at $6.4 million, down $1.5 million from the prior quarter, with the company attributing part of the decline to the timing of testing activities rather than a structural reduction in spending, while general and administrative expenses rose $0.7 million on higher personnel costs and stock-based compensation. The company disclosed that 79% of lifetime revenue per plant is expected to come after a plant is built, from Core-unit and Fuel Salt supply contracts that do not yet exist in operating form, and its cash balance stood at $283.4 million with share count steady at 105.9 million shares.

Terrestrial Energy raised its estimated lifetime revenue per IMSR plant by 29% to approximately $2.7 billion from $2.1 billion, while blended gross margin increased to 33% from 22%. The company also advanced its Texas A&M-RELLIS project into site-level development, signing ground-lease and research agreements covering about 77 acres and engaging Zachry Nuclear for site characterization. NRC approval of the PIE methodology added a second reusable element to the IMSR licensing basis, and management expects at least two additional Topical Report submissions during the remainder of 2026. The revised economics shift value capture toward recurring post-construction revenue, with Core-unit and Fuel Salt supply together representing 79% of estimated lifetime revenue at gross margins of 33% and 40%, respectively. Terrestrial Energy ended the second quarter with approximately $283.4 million of cash and investments and no financial debt, while quarterly cash burn declined to $6.4 million from $7.9 million in the first quarter.