Small Reactor, Huge Uranium Needs

Historically, small modular nuclear reactors existed as a nuclear industry talking point – elegant PowerPoint concepts promising cheaper, faster and safer atomic energy.

Now, outside Toronto, the world is about to discover whether the idea actually works.

At Ontario Power Generation’s Darlington site in Clarington, crews have begun construction on what is expected to become the first grid-scale small modular reactor in the Western world.

The GE Vernova Hitachi BWRX-300 reactor is designed to generate roughly 300 megawatts of carbon-free electricity – enough to power about 300,000 homes – and could begin operating around 2030 if construction stays on schedule.

The project is being watched closely because it represents far more than another nuclear plant.

It is a test of whether nuclear energy can reinvent itself after decades of ballooning costs and construction disasters that badly damaged public and investor confidence.

Traditional large-scale nuclear plants became infamous for delays and cost overruns. The two new reactors completed at Plant Vogtle in Georgia reportedly cost more than $35 billion and took years longer than expected to finish. Those experiences turned many utilities and investors away from large nuclear projects altogether.

SMRs attempt to solve that problem by fundamentally changing how reactors are built.

Instead of constructing massive custom-designed facilities largely in the field, SMRs are designed around factory-style manufacturing and modular assembly. Companies hope standardized components can eventually be mass-produced, reducing labor costs, shortening timelines and lowering financing risk — historically the biggest obstacle facing nuclear economics.

The tradeoff is scale.

A BWRX-300 reactor produces only a fraction of the electricity generated by a conventional gigawatt-scale nuclear plant. But estimates suggest the first Darlington SMR could cost roughly C$6 billion to C$7 billion, making it cheaper in absolute dollars than a mega-reactor, but still expensive compared with natural gas or renewables.

Supporters argue that is beside the point.

Like the first commercial jetliners or early semiconductor fabs, initial units are expected to be costly. The real economic promise comes later if manufacturing scales and dozens – or even hundreds – of reactors are deployed globally using standardized designs.

And that possibility is suddenly attracting serious attention because electricity demand is surging.

Artificial intelligence, hyperscale data centers, electrification and industrial reshoring are placing enormous strain on power grids across North America and Europe. Governments increasingly see nuclear power as one of the few reliable sources of large-scale carbon-free baseload electricity capable of supporting that growth.

If SMRs succeed commercially, the implications for uranium markets could also be profound.

A single 300-megawatt SMR may require roughly 150,000 to 250,000 pounds of uranium annually. Compare that to large reactors that use between 400,000 and 1 million pounds a year.

But multiply SMR needs across a large global buildout and uranium demand could rise by tens of millions of pounds per year over coming decades, all at a time when the global uranium market is already tight and the West is scrambling to rebuild domestic nuclear fuel supply chains.

That is why Darlington matters.

It is not simply a Canadian infrastructure project. It is a live experiment testing whether nuclear power can become scalable, financeable and politically viable again in the age of AI and energy insecurity.

If it works, the reactor outside Toronto may eventually be remembered as the place where the nuclear industry’s long-promised second act finally began.