Green Light for America’s First Small Modular Reactor

The Nuclear Regulatory Commission has given the Tennessee Valley Authority a construction permit for a small modular reactor at Clinch River in Oak Ridge, Tennessee. It is the first U.S. permit for GE Vernova Hitachi’s BWRX-300, and the NRC says the review finished in 14 months, four months earlier than planned. Ho K. Nieh, the agency’s chairman, called that a sign of how the regulator is changing.

The permit is only the start. TVA still needs an operating license before the reactor can actually run, and the utility has not announced when construction will begin. It is still aiming for commercial operation in the early 2030s. Mike Skaggs, TVA’s interim chief executive, framed the approval as more than paperwork: for him, it is part of America’s nuclear future.

The reactor itself is supposed to be small but useful. GE Vernova says the BWRX-300 should produce 300 megawatts, enough for about 300,000 homes, and fit on roughly two soccer fields. It is a simplified boiling-water reactor, with passive cooling in emergencies, meaning no pumps or operator action are needed to keep it safe. The company says later series-built units could move from first concrete to fuel loading in 24 to 36 months.

Money and momentum are spreading around the design. The U.S. Department of Energy is backing the Tennessee project with $400 million. The standard design is also being developed with Ontario Power Generation and Poland’s Synthos Green Energy, while Bechtel and Sargent & Lundy are set to help build it. In Canada, OPG is already building the first BWRX-300 at Darlington, with costs of 6.1 billion Canadian dollars for the first unit and 20.9 billion for four.

The pitch is obvious: AI data centers are pushing electricity demand higher, and nuclear offers low-carbon power around the clock. But the industry is moving faster on gas for now. New reactors will take years, while planned U.S. gas capacity has jumped sharply and utilities are racing to feed the load. That gap is exactly why SMRs keep getting sold as the future, even while the present still belongs to turbines and pipes.