Terrestrial Energy Inc.

Terrestrial Energy Inc. is a nuclear technology company focused on the development and commercialization of Generation IV nuclear power plants. Its core mission is to deliver reliable, emission-free, and cost-competitive nuclear energy to support global decarbonization efforts. The company's headquarters are located in Charlotte, North Carolina, United States.

The company's primary product is the Integral Molten Salt Reactor (IMSR) plant design, a small modular reactor (SMR) utilizing molten salt fission technology. Terrestrial Energy's business model involves providing pre-construction and construction services, supplying critical components, and offering long-term IMSR Core-unit and fuel supply. The IMSR is designed to provide high-temperature industrial heat and electricity for diverse market segments, including chemical and petrochemical facilities, data centers, and grid power.

Led by CEO Simon Irish, Terrestrial Energy Inc. became publicly traded on Nasdaq under the ticker "IMSR" on October 29, 2025, following a business combination with HCM II Acquisition Corp., which generated over $292 million in gross proceeds. The company has secured key partnerships, including an agreement with the Texas A&M University System to site an IMSR plant and collaborations with the U.S. Department of Energy for advanced reactor and fuel line pilot programs. In April 2026, Terrestrial Energy achieved a significant safety milestone by submitting a foundational topical safety analysis to the Nuclear Regulatory Commission, advancing its design towards licensed commercial operation. The company is positioning for early commercialization in 2026, with an international rollout of IMSR cogeneration plants projected to begin in the early 2030s.