These nuclear companies lead the race to build small reactors in U.S.

The nuclear industry is racing to launch advanced small reactors by the early 2030s, aiming to meet the deep-pocketed technology sector’s growing need for electricity to fuel artificial intelligence.

The world has relied largely on the same pressurized-water reactor technology for the past 70 years, but those plants have proven incredibly expensive to build in the U.S. in the 21st century.

The first new nuclear plant completed in decades, reactors 3 and 4 at Plant Vogtle in Georgia, infamously cost about $18 billion more than expected and opened seven years behind schedule. Each of those reactors can generate 1,114 megawatts of electricity, enough for more than 800,000 homes.

“Doing these new builds with that older, high pressure technology is just unaffordable,” Chris Levesque, CEO of TerraPower, an advanced reactor company co-founded and backed by Bill Gates, told CNBC.

Despite growing interest in restarting closed reactors, such as Palisades in Michigan and Three Mile Island in Pennsylvania, as a quicker and cheaper near-term solution, there remains “a whole lot of hesitation about a brand new plant,” Levesque said.

The advanced reactors under development promise to have smaller, lighter footprints that could make them cheaper and quicker to build when they are fully commercialized. But the industry is crowded with more than 90 different technologies in various stages of development around the world, according to the Nuclear Energy Agency.

The utility and tech sectors need to winnow down the field to five or 10 companies with the right technology, said John Ketchum, CEO of NextEra Energy, the largest power company by market capitalization in the U.S.

“A lot of them are under capitalized,” Ketchum said of the small nuclear startups designing advanced reactors. “So we’ve got to pick out the ones that we really want to get behind and make the bets,” the CEO said at the CERAWeek energy conference in Houston earlier this month.

Ketchum sees the first advanced reactor coming online around 2031 in the U.S., with more units potentially on the way around 2035. Technology companies will serve as a catalyst, with Levesque saying they are a “huge force” that can drive the industry forward due to their immense demand for electricity coupled with their deep pockets. Alphabet, Amazon, Meta and Microsoft together are worth seven times the value of the entire S&P 500 utility sector.

The following are some of the leading players in the U.S. market to revive nuclear power, all three of them private but with significant financial backing — often from tech companies — and customers already lined up.

TerraPower

TerraPower is the first advanced reactor company in the U.S. to move from design to construction, breaking ground on its first plant near a former coal site in Kemmerer, Wyoming in the summer of 2024. The company aims to start dispatching power by the end of 2030 to Warren Buffett’s PacifiCorp.

TerraPower’s Natrium…