US Approves TVA's BWRX-300 Small Modular Reactor Construction at Clinch River

The NRC completed its assessment in 14 months, according to TechRadar. TVA is considering as many as four BWRX-300 units at the Tennessee location, although construction timing remains undecided. The reactor uses boiling-water technology, with natural circulation helping move coolant without depending entirely on powered pumping equipment. Its safety design uses gravity, pressure and stored water to protect certain operating conditions without external power.

At 300MW, each reactor would generate roughly one-quarter of the capacity provided by newer reactors operating at Georgia's Vogtle facility. “This construction permit is more than a regulatory achievement — it's foundational for America's nuclear future,” said Mike Skaggs, TVA's interim president. The approval comes as utilities seek dependable electricity sources capable of operating continuously while AI facilities increase demand across power networks. Nuclear generation can provide steady output without depending on weather conditions, although construction costs and lengthy development periods remain major concerns.

The BWRX-300 is intended to address some construction difficulties through simpler architecture, fewer components and greater use of manufactured equipment. The same reactor technology is also gaining attention in Britain, where investors are proposing a large deployment across multiple locations. SGE has proposed as many as 14 of the reactors across three UK sites under the country's advanced nuclear policy. Britain's government introduced its Advanced Nuclear Framework earlier this year to support privately financed nuclear developments and strengthen future electricity supply. SGE's plan could require approximately £35 billion, equivalent to about $46.5 billion, if the entire proposed programme proceeds.

Canada is also preparing to deploy the same reactor design, with Ontario Power Generation developing its first unit and preparing its construction programme. In Texas, Blue Energy has applied for permission to develop BWRX-300 reactors intended to supply electricity directly to data center facilities. The repeated use of one design is expected by developers to improve procurement, manufacturing and construction efficiency across multiple projects.

That expectation remains unproven in America, where recent large nuclear developments have experienced substantial delays and costs exceeding initial estimates. TVA's project will therefore provide another test of whether smaller standardized reactors can satisfy large electricity users without repeating those construction difficulties, TechRadar reported.

Editor's Summary The US has approved TVA's construction permit for a 300MW BWRX-300 small modular reactor at Clinch River, a step toward supplying steady power as AI data centers increase electricity demand. The project still requires a separate license before operation, and the same reactor design is being proposed in the UK, Canada and Texas. Its success will test whether standardized small reactors can avoid the delays and cost overruns of recent large nuclear projects.