2 minute read | December.17.2025
Radiant, a pioneer in portable, mass-produced nuclear microreactors, has successfully closed a Series D financing raising more than $300 million to advance its mission of developing mass-produced nuclear microreactors. The round was led by Draper Associates and Boost VC and also includes financial commitments from current investors.
Orrick advised Radiant.
Radiant is building the world’s first mass-produced nuclear microreactors. The company’s first reactor, Kaleidos, is a 1 MW failsafe microreactor that can be transported anywhere power is needed. Kaleidos is designed to replace diesel generators and can be rapidly deployed to provide resilient power for remote villages, emergency response, and military installations.
Radiant plans to test its first reactor in 2026, with initial customer deployments beginning in 2028.
The Series D funding will support the scaling of commercialization efforts as Radiant prepares to break ground early next year on its recently announced R-50 factory in Oak Ridge, Tennessee.
“Micro-scaled nuclear, mass produced for the first time ever, can transform how the public thinks about nuclear energy,” said Doug Bernauer, CEO and Founder of Radiant. “This funding enables us to build our factory and keep to our DOME schedule, where we will achieve self-sustained chain reaction on a reactor designed by, built by, fueled by, and operated by Radiant alongside our partners at the Idaho National Lab.”
Orrick’s Josh Pollick and Montana Ware led the team that advised Radiant. The team also included Kelsey Repka, Will Lorenzen and Erica Kaiser.