Idaho Falls, Northwest USA – A major milestone for nuclear innovation has been reached in the Northwest USA, as the Idaho National Laboratory (INL) propelled the field forward with four experimental reactors achieving criticality in the summer of 2026. Under the banner of the Department of Energy’s Reactor Pilot Program, this historic achievement stands as a hallmark in the resurgence of American nuclear technology.

INL’s Enduring Legacy in Nuclear Energy

The Idaho National Laboratory has long been synonymous with nuclear innovation. Renowned for generating the first usable electricity from nuclear power in the 1950s and for pioneering the reactors that powered the United States’ earliest nuclear submarines, INL remains at the forefront of research and progress. This latest milestone reaffirms Idaho’s position as both a historical and modern leader in nuclear advancement, a reputation that continues to benefit local communities and the broader Northwest USA region.

Breakthroughs in Advanced Reactor Development

Criticality this year was achieved by reactors from Antares Nuclear, Valar Atomics, Deployable Energy, and Aalo Atomics, each of which attained zero-power operation. Known in technical terms as reactor criticality, this status signals the point where a reactor can sustain a controlled nuclear chain reaction for the first time. Although none of the reactors have yet moved to full-power operations, their success underlines significant momentum in advanced reactors and marks a pivotal step in revitalizing domestic nuclear energy capabilities.

The Role of the Reactor Pilot Program

This string of successes takes place under the auspices of the Reactor Pilot Program, an initiative launched by Executive Order 14301 in 2025. The program’s objective is to expedite the development of nuclear technologies outside the traditional commercial licensing pathways overseen by the Nuclear Regulatory Commission. By fostering an environment tailored to rapid reactor testing, the Department of Energy has provided a critical foundation for innovators and engineers to demonstrate new designs and safety systems.

Establishing the DOME Facility

To further support this surge in reactor innovation, the Demonstration of Microreactor Experiments (DOME) facility was recently established at Idaho National Laboratory. The DOME serves as a dedicated hub for the testing and evaluation of microreactors and other emerging nuclear concepts. The facility streamlines collaboration between public and private sector researchers, accelerates risk assessment processes, and drives advances in safe, compact nuclear systems for a diverse range of applications—including remote communities and industrial sites throughout the Northwest USA.

A New Nuclear Renaissance in Idaho

This series of milestones has fueled what many describe as a nuclear renaissance. After decades characterized by a decline in reactor construction and innovation in the United States, the recent breakthroughs at INL signal renewed scientific and commercial interest. The activity has garnered national attention and highlighted the collaborative efforts between industry, academia, and government agencies such as the Department of Energy, further solidifying Idaho’s reputation as the cradle of peaceful nuclear energy advancement.

Impact on the Local and National Landscape

The revitalization of reactor testing and technology at INL is influencing local economies, educational institutions, and workforce development across Idaho and the Northwest USA. The influx of skilled jobs, research grants, and engineering opportunities signals a positive shift for Idaho reactors and for the energy sector more broadly. As these experimental advanced reactors continue to progress, microreactors hold promise as scalable, resilient energy solutions adaptable for use across urban centers and remote areas alike.

Looking Forward: Sustaining Nuclear Innovation

With continued commitment from the Department of Energy and private stakeholders, Idaho National Laboratory is poised to drive further innovations in nuclear energy. The successful launch of multiple reactors into criticality marks not just a symbolic achievement but a practical step towards ensuring the region’s and nation’s energy resilience and sustainability. As advanced reactors and microreactors transition from experimental phases to commercial realities, the Northwest USA is expected to remain at the epicenter of nuclear progress, shaping the future of clean energy for generations to come.