Terrestrial Energy

11/06/2025

Simon Irish, our CEO, joins Brennan Moore on the Nuclear Investing Podcast to talk about how Terrestrial Energy is shaping the future of nuclear power. Discover how our Integral Molten Salt Reactor (IMSR) technology offers reliable, affordable energy and why capital efficiency is key to rapid deployment.

Key insights include:

- How IMSR plants deliver reliable, dispatchable power with a stable price point, regardless of weather or commodity risk
- The importance of using standard nuclear fuel to align with global supply chains and accelerate deployment
- Why load-following and black-start capabilities make IMSR a resilient solution for grid reliability

Watch now to hear how Terrestrial Energy is driving innovation for a cleaner, more reliable energy future: https://www.youtube.com/watch?v=lYbvj2mj2qM

11/05/2025

We’re proud to announce the expansion of our partnership with Westinghouse Electric Company through a new manufacturing and supply contract with Springfields Fuels Limited. This agreement marks a significant milestone in the commercialization of our Integral Molten Salt Reactor (IMSR) technology.

The expanded scope of our partnership includes the design and construction of an IMSR fuel production pilot plant at the Springfields site in the UK, leveraging decades of nuclear fuel manufacturing expertise. This facility will support a range of commercial-scale services - deconversion, fabrication, packaging, and transportation - essential for IMSR fuel production.

By utilizing Standard Assay Low-Enriched Uranium (SALEU), our IMSR plants align with existing global fuel supply chains, enabling a practical and accelerated path to deployment. This collaboration enhances capital efficiency and scalability, reinforcing our Western supply chain strategy.

We thank our partners at Westinghouse for their continued commitment to innovation and look forward to advancing clean, reliable, and flexible energy solutions together.

Read the full release:

Agreement encompasses deconversion, fabrication, packaging, and transportation services for Integral Molten Salt Reactor (IMSR) fuel production, paving the...

09/22/2025

We congratulate Ted J. Garrish on his appointment as Assistant Secretary for Nuclear Energy at the U.S. Department of Energy.

With decades of leadership advancing U.S. and international nuclear policy, Ted’s experience will be instrumental in supporting commercial deployment of advanced nuclear energy.

We look forward to collaborating with Mr. Garrish as we progress our IMSR technology towards commercialization.

08/12/2025

Terrestrial Energy is proud to announce its selection for the U.S. Department of Energy Office of Nuclear Energy’s Advanced Reactor Pilot Program, which represents a significant milestone in the company's commercialization pathway.

“We are pleased to have been selected by the DOE for this important project, which will help the U.S. win the race to energy dominance that is now so important for competitive commercial AI and the re-shoring of U.S. manufacturing,” said Simon Irish, CEO of Terrestrial Energy.

Terrestrial Energy’s IMSR plant’s unique design characteristics make it ideally suited to meet the rapidly growing demand for clean, reliable, and flexible energy supply across multiple industrial sectors including, industrial heat and power users, and data center and electric grid operators.

Read the announcement here:

Advanced Reactor Pilot Program launched by DOE to expedite authorization and commercialization of advanced nuclear reactor designs Terrestrial Energy’s...

08/06/2025

🎙️ New Podcast 🎙️
Today, an episode of the S**C Insider podcast featuring an interview with Terrestrial Energy CEO Simon Irish and HCM II CEO & Chairman Shawn Matthews was released. Simon and Shawn discussed emerging trends in nuclear energy, the need for industrial heat alongside power, and the surge in public markets enthusiasm for nuclear energy to meet growing power demands.

Listen to the episode here:

Written by Ashley Penfield. Simon Irish, CEO of Terrestrial Energy, and Shawn Matthews, CEO & Chairman of HCM II, Discuss Emerging Trends and Nuclear Power

07/29/2025

Our CEO, Simon Irish, recently joined the UCAN Power - United Coalition for Advanced Nuclear Power Podcast to discuss how Terrestrial Energy is advancing the future of clean, reliable, and cost-competitive nuclear energy.

In an engaging conversation with host Jim Howe, Simon discusses why the Integral Molten Salt Reactor (IMSR®) is a game-changer for global decarbonization, how our technology supports energy security and industrial competitiveness, and the role of advanced nuclear in achieving net-zero goals.

🎧 Listen to the full episode here:

In this episode of the Advanced Nuclear podcast, Simon Irish, CEO of Terrestrial Energy, talks about his company, its Integral Molten Salt Reactor (IMSR) technology, and the financial aspects of the advanced nuclear industry. Simon shares his unique background in finance and how it influences his ap...

07/08/2025

Terrestrial Energy is proud to announce the commencement, in partnership with NRG PALLAS, of the final phase of a graphite irradiation and selection program for the Integral Molten Salt Reactor (IMSR). These irradiation tests, conducted at NRG PALLAS’ High Flux Reactor (HFR) in the Netherlands, will enable Terrestrial Energy to finalize the qualification of graphite for licensing and operation of the IMSR plant.

This is a significant milestone for Terrestrial Energy's supply chain development, as it marks the first time a Western advanced reactor developer has progressed to this stage of graphite qualification for a commercial reactor.

Read more here:

Materials testing enables selection of graphite grade and licensing for its Generation IV Integral Molten Salt Reactor (IMSR) nuclear technology, designed...

06/24/2025

Terrestrial Energy CEO Simon Irish recently connected with Alexander C. Kaufman to discuss our latest partnership with leading energy solutions provider Ameresco for an article in Latitude Media.

This strategic collaboration, focused on the development of customized energy solutions using our Integral Molten Salt Reactor (IMSR) technology, will combine the uniquely adaptable output capabilities of our IMSR plant design with Ameresco’s deep expertise in clean energy infrastructure to deliver customized, hybrid clean energy supply systems tailored to meet a variety of customer needs. This partnership stands to significantly advance Terrestrial Energy's commercial momentum while supporting decarbonization and energy security goals across North America.

Read the full article here: https://www.latitudemedia.com/news/nuclear-startup-terrestrial-energy-inks-a-deal-to-use-gas-as-a-bridge-to-smrs/
Read our press release here: https://www.globenewswire.com/news-release/2025/06/24/3104171/0/en/Terrestrial-Energy-and-Ameresco-Announce-Collaboration-to-Develop-IMSR-Plant-Projects-for-Customized-Energy-Supply.html

Exclusive: The reactor developer is working with Ameresco to power data centers with gas power that can later convert to nuclear.

06/03/2025

"We think that the valuable proposal to the market is not demonstrating how you can build one plant, it’s demonstrating how you build a fleet of plants."

Terrestrial Energy CEO Simon Irish recently connected with Ignition Lead Nuclear Reporter Rachael Zisk to discuss the company's IMSR technology, the outlook for the advanced nuclear sector, and the strong progress being made toward Terrestrial Energy's commercialization goals.

Read the full Q&A here: https://ignition-news.com/a-qa-with-simon-irish-ceo-of-terrestrial-energy/

As the advanced nuclear sector gets closer to commercialization, firms are eyeing the public markets for access to capital and to take advantage of public excitement for a potential new, clean, safe energy source. Terrestrial Energy is the latest nuclear firm to finalize plans to go public. The molt...

05/29/2025

Today, Terrestrial Energy announced the appointment of Brian Thrasher as Chief Financial Officer.

This appointment serves to expand Terrestrial Energy’s depth of expertise and leadership amidst accelerating enthusiasm for nuclear technology advancement, highlighted by the Trump Administration’s latest Executive Order to spur the deployment of advanced nuclear technologies.

Read the full announcement here:

05/20/2025

Terrestrial Energy is pleased to announce the appointment of energy and finance veteran Rob Jones to its Board of Directors. Mr. Jones' more than five decades of energy and power finance experience, including as Vice Chairman of Investment Banking at Morgan Stanley, will be invaluable to the company as we scale our business.

Read more here:

Mr. Jones brings more than five decades of energy and power finance experience, including as Vice Chairman of Investment Banking at Morgan Stanley ...

03/26/2025

Terrestrial Energy CEO & Director Simon Irish sat down with Bloomberg's Maggie Eastland to discuss the company's plans to become the first publicly traded molten salt reactor developer through a business combination with HCM II Acquisition Corp.

This transaction will be a critical step toward our vision of delivering high-temperature, clean, firm, and flexible heat and electricity, with sector-competitive economics and leading time-to-market at fleet scale.

Read more:

A developer of small nuclear reactors is going public via a special purpose acquisition company led by former Cantor Fitzgerald Chief Executive Officer Shawn Matthews.