The U.S. military is investing $2.2 billion in micro nuclear reactors, a move that could accelerate the adoption of small modular reactors (SMRs) for powering AI data centers and other energy-intensive infrastructure. On August 27, the Army approved funding for five developers to each deliver a microreactor to a U.S. Army site as part of the Janus Program, launched in October 2025.

This isn't just about military power needs. The Army's strategy explicitly aims to use government spending to jumpstart civilian nuclear projects. An Army representative stressed the program's broader mission, noting that success means helping "multiple nuclear companies in developing truly reliable and affordable nuclear microreactors which they can sell to other buyers beyond just the military".

Why Is the Military Suddenly Focused on Tiny Nuclear Reactors?

The timing reflects a larger energy crisis. Growth in artificial intelligence, advanced manufacturing, electrification, and national security infrastructure is creating unprecedented demand for reliable, affordable power. Traditional large nuclear plants take decades to build, making them impractical for meeting urgent energy needs. SMRs offer a faster alternative, with standardized designs and modular construction that could theoretically be deployed more quickly and repeatedly at commercial scale.

The Janus Program itself was authorized by Executive Order 14299, signed in May 2025, which aims for operation of an Army-regulated nuclear reactor at a domestic military installation no later than September 30, 2028. This aggressive timeline reflects how seriously policymakers view the energy shortage.

What Does This Mean for AI Data Centers?

One concrete example shows the potential. The U.S. Department of Energy's National Nuclear Security Administration recently selected Amentum to enter negotiations for a phased lease supporting an integrated AI and energy infrastructure project at the Savannah River Site. The project would pair a 1-gigawatt AI data center with approximately 2 gigawatts of on-site power generation, initially fueled by natural gas with a pathway to advanced nuclear generation.

However, experts caution that SMRs remain unproven at scale. Francesco Starace, former CEO of Enel Group and now a partner at EQT Group, noted that while SMRs show promise, "it is not obvious that they will fulfil the promise of becoming cheap and easy to manage." He added, "I don't think it's unlikely; I think it's possible. But we don't have that clarity right now".

What Are the Key Challenges for Scaling SMRs?

Deploying new nuclear capacity fast enough will require more than innovative reactor designs. Success depends on several interconnected factors that the industry is still working to solve:

• Licensing and Regulatory Certainty: The U.S. administration's goal of accelerating Nuclear Regulatory Commission reviews reflects growing recognition that regulatory certainty is essential to expanding nuclear generation. Maintaining rigorous safety standards while improving predictability can help bring new reactors online more quickly.
• Project Execution and Operational Excellence: The industry has spent years proving that advanced reactors can work. The focus now is proving they can be deployed quickly, efficiently, and repeatedly at commercial scale, requiring experienced partners who understand engineering, environmental permitting, and long-term operations.
• Financing and Long-Term Economics: Financing remains one of the largest challenges for new nuclear generation. Long construction schedules have historically driven financing costs that account for much of a project's overall expense. SMRs offer potential to change that equation through standardized designs and repeatable project delivery.
• Synchronizing Different Industries: AI has urgent timelines, with needs surfacing in months or years, while the energy field traditionally thinks in decades. When these two industries operate at different paces, mistakes can happen, but synchronization can accelerate progress significantly.

How to Evaluate SMR Investment Opportunities

For investors and industry observers tracking this space, several indicators suggest momentum is building:

• Government Commitment: Executive orders, military funding, and regulatory acceleration all signal sustained political support for nuclear deployment, reducing policy uncertainty that has historically plagued the sector.
• Market Timing: Only two SMR projects are currently in operation worldwide, one in China and one in Russia, suggesting the market is still in early innings. Research from leading investment banks suggests SMRs could become a $1 trillion global opportunity over several decades.
• Real-World Deployment: Military adoption would provide a clear signal that SMRs can operate reliably at scale, potentially unlocking civilian projects and long-term power purchase agreements that improve project certainty.

However, significant risks remain. SMR developers remain unprofitable and have largely relied on shareholder funding to stay operational. Customer pipelines, while impressive, lack firm financial commitments and could reverse course at any time.

Is the Energy Transition Driven by Policy or Technology?

Starace offered a perspective that challenges conventional thinking about energy policy. He argued that the energy transition is fundamentally technology-driven and largely immune to political shifts. "Government policies can accelerate or slow down the trend, but the trend is driven by technology," he stated. From his 40-year career perspective, energy transitions have always been driven by technological innovation, and the current shift is simply moving faster than previous transitions because computing power and material science are advancing rapidly.

Starace

This suggests that even if political support wavers, the underlying economic logic pushing AI companies and militaries toward nuclear power will persist. The challenge isn't convincing policymakers to support SMRs; it's proving the technology works reliably and affordably at scale.

The race to build America's nuclear future has begun, with the military's $2.2 billion commitment serving as both a catalyst and a test case for whether SMRs can finally deliver on decades of promises.