U.S. approves the first advanced nuclear reactor in more than 40 years

We just reached a huge milestone for nuclear energy.

This week the U.S. Nuclear Regulatory Commission approved TerraPower’s Natrium reactor in Wyoming.

That single decision could speed up the timeline for advanced nuclear projects across the country.

For investors watching the future of energy, this is a big moment.

It is the first U.S. permit for a new commercial reactor build in nearly a decade. Even more notable, regulators finished the review in about 18 months. Earlier estimates suggested the process could take around 27 months. The final vote was unanimous.

It's a huge boost for nuclear energy stocks.

The project will use TerraPower’s Natrium reactor design. This is a sodium cooled fast reactor that runs at higher temperatures than traditional light water reactors. Higher temperatures allow the plant to generate electricity more efficiently.

The system also includes molten salt heat storage. That storage acts like a built in battery. It can release extra electricity to the grid during periods of high demand.

Base output from the reactor is about 345 megawatts. When the heat storage system is used, the plant can deliver additional electricity during peak demand hours.

The reactor will run on HALEU fuel, short for high assay low enriched uranium. This fuel is enriched to about 15% to 20% uranium-235. That higher enrichment allows the reactor core to be smaller and more efficient.

The plant will be built on the site of a retiring coal facility in Kemmerer, Wyoming. Construction on major reactor components could begin within weeks.

TerraPower is targeting 2030 for the plant to begin operating.

The disruption behind the news: America just approved its first serious attempt at restarting a modern nuclear industry.

This is not about one reactor.

But about resetting the economics of clean baseload power.

For decades, nuclear power in the United States has been stuck in a cycle of old reactor designs, massive upfront capital risk, and approval processes that can take a decade or more.

Natrium is designed to break that cycle. Sodium cooling removes the high-pressure water systems that shaped traditional reactors. That allows higher temperatures, better thermal efficiency, and simpler designs that could eventually be manufactured in sections and assembled on site.

The molten salt storage system is the biggest market advantage. It lets a nuclear plant behave like a hybrid of baseload generation and a battery. When electricity demand spikes, the plant releases stored heat and increases power output without ramping the reactor itself. Utilities get flexible nuclear power instead of the rigid always-on plants of the past.

That matters because the grid is changing fast. AI data centers, electrified industry, and electric vehicles are pushing electricity demand higher after years of flat growth. That is why Big Tech met Trump to discuss AI's insane electricity demand. Several grid forecasts suggest U.S. electricity demand could grow about 15% to 20% by the early 2030s. Wind and solar alone can’t stabilize that level of growth because their output depends on weather.

Global investors are also starting to move capital back into the U.S. energy system as demand projections climb. In fact, Japan recently invested $36 Billion in U.S. energy projects, signaling that global capital is preparing for a new buildout cycle across power generation and transmission.

Cost is the other lever. This demonstration plant costs up to $4,000,000,000 for about 345 megawatts of base capacity. That sounds expensive until you compare it with recent large nuclear projects that ran past $10,000,000,000 each. If TerraPower and its partners standardize the design and build multiple reactors, the cost per unit could fall significantly after the first few plants.

The storage system also changes the revenue math. A 345-megawatt plant running at a typical 90% capacity factor would produce about 2.7 terawatt-hours of electricity per year. If most of that power sells near a wholesale average of about $40 per megawatt-hour, annual revenue would be roughly $110,000,000. But if the molten salt system can shift some production into peak demand periods, when prices often spike to $150 per megawatt-hour or more, moving just 10% to 15% of generation into those windows could add tens of millions of dollars in yearly revenue. That pricing advantage is one reason flexible nuclear is starting to look investable again.

Tech companies are already betting on that future. Meta Platforms signed an agreement earlier this year to explore building up to eight Natrium plants. Data centers are becoming anchor customers for next-generation nuclear power.

What to watch next

Fuel supply will determine how fast advanced reactors scale.

HALEU is scarce today.

Who controls that supply will influence how quickly new reactors get built.

The United States currently has very limited domestic production of HALEU fuel. Much of the world’s supply historically came from Rosatom, Russia’s state nuclear company, which is now politically difficult to rely on. The Department of Energy is working to build a domestic supply chain, but expanding enrichment and fuel fabrication will take years.

Watch three numbers over the next 24 months. The first is HALEU production capacity in kilograms per year. The second is how many additional reactor permits the U.S. Nuclear Regulatory Commission processes after this one. The third is how many hyperscale tech companies sign long-term power agreements with advanced nuclear developers.

This Wyoming permit just opened the door a little wider for advanced nuclear.

If the first TerraPower Natrium reactor actually comes online by 2030, nuclear could move out of the pilot stage and start looking like real infrastructure again. For decades, the industry has been stuck in a kind of freeze, with new projects slow, expensive, and hard to finance.

But if this one plant proves reactors can be built on schedule, that perception could change fast. And once investors believe timelines are real again, capital could start flowing back into nuclear stocks.