Small Modular Reactors: Is This the Next Big Thing — and Should You Invest?

May 2026

Nuclear energy has always had a branding problem. Mention it in a room and someone will immediately bring up Chernobyl, Three Mile Island, or Fukushima. The image most people carry is of a massive, complicated, expensive, and vaguely terrifying facility — the kind of project that takes decades to build, costs billions more than planned, and requires a small army of engineers just to keep it from doing something catastrophic.

That image may be about to change. A new generation of reactors — smaller, faster to build, cheaper to operate, and fundamentally safer by design — is moving from the pages of engineering journals into actual construction sites. They’re called small modular reactors, or SMRs. And if the level of money, government backing, and corporate interest pouring into them is any indication, they might be one of the most important energy technologies of the next decade.

So what exactly are they? Why are tech giants scrambling to get their hands on one? And should you be putting your money into the companies building them?

What Makes SMRs Different

A traditional nuclear power plant is, in a word, enormous. It typically produces somewhere between 1,000 and 1,500 megawatts of electricity. Building one takes the better part of a decade, often longer, and the final bill tends to exceed initial projections by billions. The cooling systems alone are a major civil engineering challenge — most large reactors depend on a constant supply of water to prevent the core from overheating, which is why you almost always find them next to rivers, lakes, or coastlines.

Small modular reactors flip that model on its head. Defined by an output of roughly 300 megawatts or less per unit, they are designed to be built in factories and shipped to site rather than constructed piece by piece on location. The “modular” part is key: if you need more power, you add another module. If you need less, you don’t. That flexibility is something no conventional reactor can offer.

More importantly, many SMR designs are what engineers call passively safe. Rather than relying on active cooling systems that require power and human intervention to function, they use physics — gravity, natural convection, the behavior of materials at high temperatures — to shut themselves down safely if something goes wrong. Several designs use liquid metal or molten salt as coolant instead of water entirely, eliminating the need for the large external water supply that traditional reactors require. That means they can be sited in places where a conventional plant simply couldn’t go: desert regions, landlocked industrial areas, remote communities, military bases.

The construction timeline difference alone is significant. A large-scale nuclear plant might take 15 to 20 years from approval to operation. Some SMR developers are targeting 24 months from site preparation to first power.

The AI Energy Problem — and Why Big Tech Wants a Reactor

Here’s the context that explains why SMRs suddenly became a corporate priority rather than just a long-term energy policy discussion.

Artificial intelligence is consuming electricity at a rate that is straining grids across the United States and Europe. Training large AI models and running the data centers that power AI services requires enormous quantities of reliable, round-the-clock power. Wind and solar, however useful, don’t provide that kind of consistency — the sun sets, the wind stops. Battery storage helps, but not enough. What hyperscalers like Microsoft, Google, Meta, and Amazon actually need is clean baseload power: electricity that flows 24 hours a day, 365 days a year, regardless of weather.

Nuclear is the only clean energy source that does that. And SMRs, which can be sited closer to data center campuses than large plants, are the version of nuclear that tech companies can actually plan around.

Meta — the company behind Facebook and Instagram — has moved aggressively on this front. In January 2026, Meta partnered with Oklo to develop a 1.2 gigawatt power campus in Pike County, Ohio, which will house 16 Aurora Powerhouse reactors across 206 acres, with the first phase targeting 150 MW operational by 2030. Meta has also entered an agreement with TerraPower for up to eight of its Natrium nuclear plants.

Google signed the first corporate SMR power purchase agreement in August 2025, working with Kairos Power on a project in Oak Ridge, Tennessee — more on that location shortly — that aims to scale to 500 megawatts for Google’s data center operations.

Tesla’s energy ambitions are well documented, and Elon Musk has been vocal about the need for nuclear power as part of a serious clean energy strategy. The broader Tesla/xAI energy infrastructure buildout is one of the forces putting pressure on the grid that makes SMR development more urgent.

Amazon has options for more than 5 gigawatts of capacity from X-energy through 2039. Microsoft revived a landmark deal for 837 megawatts at Three Mile Island. NVIDIA’s investment arm has backed TerraPower.

The list goes on. The message from Silicon Valley is consistent: we need nuclear, and we need it now.

Tennessee Valley Authority — America’s Biggest SMR Bet

If you want to understand how serious the U.S. government is about SMRs, look at what’s happening in Tennessee.

The Tennessee Valley Authority, the largest public power provider in the United States, has become the centerpiece of America’s SMR push. In September 2025, TVA and ENTRA1 Energy announced an agreement to deploy up to six gigawatts of new nuclear power using NuScale’s SMR technology — described as the largest SMR deployment program in U.S. history.

The DOE subsequently selected TVA for $400 million in federal funding to advance deployment of a GE Vernova Hitachi BWRX-300 at the Clinch River Nuclear site in Tennessee. And Google’s Kairos Power agreement, which will supply power to the TVA system, is also based in Oak Ridge, Tennessee.

Tennessee has effectively become the epicenter of the American SMR industry — combining federal funding, utility scale ambition, and private tech sector demand in a way that no other state has matched.

The Investment Case — and the Risks

This is where things get interesting for investors. The sector is real, the technology is advancing, and the demand is genuine. But the stocks are volatile, the revenues are mostly still in the future, and the risks are significant.

Here are the main publicly traded names worth understanding:

Oklo (OKLO) is arguably the most talked-about name in the sector. Backed by Sam Altman, CEO of OpenAI, Oklo is developing the Aurora fast reactor — a compact, liquid-metal-cooled design that can run on recycled nuclear fuel. Its customer pipeline exceeds 14 gigawatts, including the Meta deal, a master agreement with Switch for up to 12 gigawatts, and a 500 megawatt deal with Equinix. Oklo expects commercial operations to begin between late 2027 and early 2028. The stock has fallen around 11% year-to-date in 2026, which some analysts view as a buying opportunity given the pipeline.

NuScale Power (SMR) has a critical competitive advantage: it is the only company in the world with an NRC-certified SMR design. Its 77 MWe Power Module received Standard Design Approval in May 2025. The TVA/ENTRA1 deployment agreement covers up to 6 gigawatts of NuScale capacity. NuScale’s first reactor is expected online by 2030. The stock has been more volatile — down nearly 27% year-to-date — largely due to weak recent revenue numbers. But analysts point out that no revenue yet is expected at this stage, and the consensus price target sits well above current trading levels. For investors who want the name with the most regulatory credibility, NuScale is the play.

Nano Nuclear Energy (NNE) is the smallest and most speculative of the three. It is developing microreactor concepts — the ZEUS, ODIN, and KRONOS designs — as well as a nuclear fuel transportation subsidiary. NNE received a Department of Energy GAIN voucher in April 2026 for its KRONOS microreactor program and has been selected by the Air Force for a pilot program at Eielson Air Force Base in Alaska. Its market cap sits around $1.28 billion, and the stock has been caught up in the sector momentum — up 25% over a recent one-week period during the April 2026 nuclear rally.

Centrus Energy (LEU) is a different kind of nuclear play. Rather than building reactors, Centrus is the only U.S. company producing HALEU — high-assay low-enriched uranium, the specialized fuel that many next-generation SMR designs require. As SMR deployments scale, HALEU supply becomes a critical bottleneck, and Centrus sits at that chokepoint. For investors who want nuclear exposure without betting on which reactor design wins, Centrus is worth a close look.

TerraPower is not yet publicly listed, but it is one of the most closely watched names in the sector. Founded by Bill Gates, it received a $650 million Series C in June 2025, backed by NVIDIA’s NVentures. Its Natrium sodium-cooled reactor project in Wyoming began construction activities in April 2026. Meta has an agreement for up to eight Natrium plants.

The Bear Case

It would be dishonest to write about SMR investing without acknowledging the skepticism. Critics make some valid points.

NuScale’s first commercial project — the Carbon Free Power Project in Idaho — was cancelled in 2023 after costs spiraled and utility partners pulled out. That failure is a reminder that the gap between a working reactor design and a commercially viable deployment is wide and expensive.

SMRs, by being smaller, lose some of the economies of scale that make large nuclear plants cost-competitive on a per-megawatt basis. Some analysts argue that the “factory-built” cost savings don’t fully compensate for that. The nuclear waste question hasn’t changed — SMRs still produce radioactive material that requires long-term management.

And most of the stocks in this sector are, at their core, pre-revenue companies with substantial cash burn. They are bets on a future that is plausible and well-funded, but not yet delivered.

The Bottom Line

The honest answer to “is this the next big thing?” is: probably, yes — but on a longer timeline than the stock prices sometimes imply.

The fundamentals are genuinely strong. AI’s energy hunger is real and growing. The grid needs clean baseload power that wind and solar can’t provide alone. Governments on both sides of the Atlantic are backing SMR development with serious money. The largest tech companies in the world are signing contracts. The Tennessee Valley Authority is building. The regulatory framework is catching up.

SMRs are not a speculative idea anymore. They are an industry in early construction. The question for investors is not whether SMRs will matter, but which companies will survive long enough — and execute well enough — to capture the opportunity when the first reactors come online.

If you’re considering exposure, size your position accordingly. This is high-conviction, long-duration investing. The payoff window is 2028 to 2035. The companies with the strongest regulatory footing (NuScale), the most compelling customer pipelines (Oklo), and the critical infrastructure angle (Centrus) are the ones worth watching most closely.

Nuclear energy had a branding problem. It may be getting a new story.

This article is for informational purposes only and does not constitute financial advice. Always do your own research before investing.