Collaboration with Ameresco will advance Terrestrial Energy’s commercial momentum.
The partnership combines Terrestrial Energy’s innovative IMSR technology with Ameresco’s expertise in designing and managing complex energy systems. This synergy aims to provide scalable, reliable, and sustainable energy. Nicole Bulgarino, Ameresco’s president of federal solutions and utility infrastructure, stated: “Our collaboration with Terrestrial Energy reflects our commitment to expanding the capabilities of our clean energy portfolio. By exploring hybrid energy systems that leverage the IMSR plant’s heat and power output, we’re enhancing our ability to deliver reliable, cost-effective and sustainable solutions tailored to the evolving needs of data centers and industrial customers.”
The IMSR’s design allows for integration with other energy sources, such as natural gas, to ensure early electricity delivery during construction before the nuclear systems are fully operational. Unlike traditional Light Water Reactors, the IMSR’s thermal, steam, and electric systems are separated from regulated nuclear components, offering flexibility to meet specific customer needs while maintaining competitive pricing.
Simon Irish, CEO of Terrestrial Energy, emphasized the adaptability of the IMSR, stating: “Site and use-specific customisation of IMSR plant output and its hybridisation with other systems including natural gas are essential to capture today’s market for near-located supply of reliable clean nuclear energy. Ameresco’s proven track record in energy system integration creates a powerful platform to develop IMSR plant projects that meet the emerging requirements of rapidly growing demand for reliable, carbon-free energy across multiple industrial sectors.”
The partnership is developing multiple U.S. sites for these modular IMSR projects, which can supply zero-carbon thermal energy for efficient power generation and direct industrial heat applications. Terrestrial Energy’s approach leverages existing nuclear industry supply chains and standard enrichment fuel, avoiding reliance on high-assay low-enriched uranium (HALEU).
This collaboration builds on Terrestrial Energy’s recent progress, including its selection by Texas A&M University to site a commercial-grade IMSR plant at the RELLIS campus. In May 2025, Ameresco secured a $78 million financial package to support its battery storage and energy infrastructure projects, further strengthening its capacity to contribute to this partnership. The initiative aligns with growing demand for clean, reliable energy to support industrial growth and data center expansion while promoting sustainable energy solutions.
