Terrestrial Energy

Nuclear technology company developing the Integral Molten Salt Reactor

Terrestrial EnergyIndustry| Nuclear Power

|

Founded| 2012
Headquarters| Charlotte, North Carolina, United States
Oakville, Ontario, Canada

Key people

| Simon Irish (CEO)
Website| https://www.terrestrialenergy.com/

Terrestrial Energy is a nuclear technology company working on Generation IV nuclear technology.[1] It expects its nuclear plant to produce cost-competitive, high-temperature thermal energy with zero emissions.

The company is developing a 2x195 MWe Integral Molten Salt Reactor (IMSR) plant design.[2] The Canadian Nuclear Safety Commission[3] completed its programmatic Pre-Licensing Vendor Design Review[4] of the IMSR plant design successfully in 2023.[citation needed]

The IMSR uses molten salt reactor technology and is one example of a small modular reactor (SMR) characteristic of Generation IV nuclear reactor designs.

## History

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Terrestrial Energy announced plans to go public[5] in March 2025 via special purpose acquisition company HCM II Acquisition Corp.

Terrestrial Energy and The Texas A&M University System announced plans in February 2025 to site an IMSR plant[6] at the Texas A&M-RELLIS campus about 9 miles west of Texas A&M University in College Station.

The company announced an agreement with EnergySolutions[7] in December 2024 to explore possible siting of IMSR plants at EnergySolutions-owned sites. In October 2024, Terrestrial Energy signed an agreement with Viaro Energy[8] to develop an IMSR plant in the United Kingdom.

## Design

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Terrestrial Energy claims several principal advantages for the IMSR over legacy nuclear power plants. It claims that its 585 degrees Celsius high-temperature heat supply enables a nearly 50% improvement on electricity generating efficiency with a steam Rankine cycle, compared to a similarly sized plant using LWR technology. As a consequence of its modular design, the power plant construction time is expected to be shortened to four years, versus 8-12 for legacy designs.

The Terrestrial Energy IMSR plant is designed to generate either electricity or industrial steam. The basic IMSR cogeneration plant design uses two reactors to generate just under 400 MW of electricity (net) or just over 800 MW of thermal energy, or a customized mix of the two.

The reactor uses molten salt/uranium blend as both fuel and coolant,[9] the signature characteristic of molten salt reactor technology.

Terrestrial Energy’s IMSR is one of the very few Generation IV nuclear plant designs that uses standard-assay low-enriched uranium fuel rather than high-assay low-enriched uranium (HALEU) fuel and claims to leverage proven technologies in a unique way. Terrestrial Energy says that this is intended to reduce licensing and timeline risks that have slowed the adoption of other approaches.

## References

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1. ^ Temple, James. "Advanced nuclear finds a more welcome home in Canada than the U.S." MIT Technology Review. Retrieved 11 February 2019.
2. ^ "Terrestrial signs up BWXT for technical support - World Nuclear News". www.world-nuclear-news.org. Retrieved 11 February 2019.
3. ^ Yetisir, Metin. "Recent Developments in Small Modular Reactors in Canada" (PDF).
4. ^ "Pre-Licensing Vendor Design Review". 3 February 2014. Retrieved 9 February 2021.
5. ^ Chant, Tim De (2025-03-26). "Nuclear startup Terrestrial Energy goes public via SPAC, netting $280M in merger". TechCrunch. Retrieved 2025-04-17.
6. ^ "Texas A&M System Goes Nuclear". stories.tamu.edu. 2025-02-04. Retrieved 2025-04-17.
7. ^ "EnergySolutions, Terrestrial sign MoU on IMSR deployment". World Nuclear News. Retrieved 2025-04-17.
8. ^ Staff Writer (2024-10-24). "New partnership to advance MSR technology in UK". Nuclear Engineering International. Retrieved 2025-04-17.
9. ^ Wang, Brian (2022-08-30). "Terrestrial Energy and Alberta Commercializing SMR Reactor | NextBigFuture.com". Retrieved 2022-08-31.

## External links

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* Terrestrial Energy | Leading the Way to a Bright Energy Future | 4th Generation Nuclear Power Official website