A Houston-based nuclear startup has successfully brought its Unity microreactor to criticality at the Idaho National Laboratory, marking the third such achievement by a private company in recent weeks. The milestone, reported by ans.org, fulfills a specific timeline set by federal leadership for advancing small modular reactor technology.
Deployable Energy announced that its 1-megawatt electric (MWe) Unity microreactor achieved criticality on July 1, 2026. The test took place at the National Reactor Innovation Center within the Idaho National Laboratory (INL) in southeastern Idaho. This event completed a trio of reactor startups that occurred between early June and early July, meeting the deadline established by President Donald Trump’s Executive Order 14301, which called for three reactors to reach criticality by July 4, 2026.
A Rapid Development Timeline
The speed of Deployable Energy’s progress has drawn attention within the nuclear industry. The company reached criticality approximately 150 days after the project’s official kick-off. This rapid timeline underscores the efficiency of the testing infrastructure available at INL, a hub for nuclear innovation that supports both government and private sector development.
Deployable Energy is part of the Department of Energy’s Nuclear Energy Launch Pad program, with selections announced in late April 2026. It is important to note that while the company benefits from this federal support structure, it was not selected for the separate Reactor Pilot Program, which chose ten different companies for its specific funding and testing tracks.
The Unity reactor represents a distinct design approach compared to larger traditional plants. It is a high-temperature, gas-cooled microreactor that utilizes standard low-enriched uranium and uranium dioxide fuel. The system relies on an actively cooled helium primary loop to manage heat transfer. This design philosophy aims to provide scalable, modular power solutions that can be deployed in locations where large-scale grid infrastructure is unavailable or impractical.
Context of Recent Milestones
The July 1 milestone followed two other significant achievements by different nuclear firms at the same Idaho facility. Antares Nuclear achieved zero-power criticality with its Mark-0 reactor on June 4, 2026. Shortly thereafter, Valar Atomics reached criticality with its Ward 250 reactor on June 22, 2026.
These consecutive successes highlight a period of accelerated activity in the small modular reactor sector. The Idaho National Laboratory has become a central testing ground for these next-generation technologies, allowing companies to validate their designs under real-world conditions before commercial deployment. The concentration of these milestones in a short timeframe suggests that regulatory and technical hurdles are being cleared more efficiently than in previous years.
Commercial Applications and Future Testing
Beyond the technical achievement, Deployable Energy is positioning itself for significant market entry. The company stated it has secured over $10 billion in letters of intent for various power applications. These potential contracts range from powering large data centers to providing energy for remote island communities.
“Achieved significant commercial traction with over $10 billion in [LOIs] ranging from data centers to remote island community power,” the company noted in its letter of intent submitted to the Nuclear Regulatory Commission (NRC), as first reported by the American Nuclear Society.
The firm is currently working with partners in Utah and Texas to explore specific use cases, particularly for data center operations and remote facility power. The submission of a letter of intent to the NRC signals the commencement of preapplication processes, a necessary step toward full regulatory approval for commercial operation.
The immediate future for the Unity microreactor involves rigorous testing phases. Deployable Energy plans to evaluate reactor physics, load-following capabilities, inherent safety features, and full-power operations. These tests will determine whether the reactor can reliably adjust its output to match demand fluctuations—a critical feature for integrating nuclear power into modern grids that increasingly rely on variable renewable sources.
Energy Landscape in Eastern Idaho
The development of microreactors at INL aligns with broader energy discussions in Bonneville County and across the state. As demand for reliable, baseload power grows—driven partly by the expansion of data centers and industrial facilities—local utilities are exploring diverse options to ensure grid stability.
While microreactors represent one avenue for new capacity, other projects are also underway in the region. For instance, Fall River Electric Cooperative has pursued new natural gas generation to shore up power supply for eastern Idaho customers. Additionally, Idaho Power has been restructuring its operations, recently finalizing a deal to divest Oregon operations. These concurrent developments illustrate a complex energy landscape where nuclear innovation, fossil fuel reliability, and utility restructuring intersect.
The success of the Unity microreactor adds another data point to the ongoing debate over how best to meet Idaho’s growing energy needs. Proponents argue that small modular reactors offer a clean, safe, and scalable alternative to traditional power plants. Critics often point to regulatory costs and deployment timelines as barriers. However, the recent string of criticalities at INL suggests that the technical viability of these systems is becoming increasingly clear.
As Deployable Energy moves into the next phase of testing, the focus will shift from achieving criticality to demonstrating long-term operational reliability. The outcomes of these tests could influence future investment decisions not only for Deployable Energy but for the broader microreactor industry. With federal support and private capital converging on Idaho’s nuclear infrastructure, the state remains at the forefront of next-generation energy development.