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On December 19, 2025, Radiant Nuclear raised $300 million to deploy nuclear microreactors, capable of powering data centers and critical infrastructures with clean, stable, and continuous energy.
The American startup Radiant Nuclear reaches a major milestone: more than 300 million dollars raised to develop its transportable nuclear microreactors, called Kaleidos.
These small, compact power plants are designed to produce around 1 MWe (electrical megawatt) per unit, enough to power sensitive sites or critical infrastructures. Their objective: to provide continuous energy 24/7, where conventional networks or diesel generators may be insufficient or expensive.
Data centers consume huge amounts of electricity, and this demand is increasing with the rise of the cloud and artificial intelligence.
Current solutions, such as conventional electrical networks or diesel generators, have limitations:
Microreactors provide a reliable, sustainable and scalable solution, allowing data centers to remain operational without interruption, even in the event of network outages or in isolated areas.
Radiant Nuclear has signed an agreement with Equinix, the world leader in data centers, to supply 20 microreactors. The $300 million investment will make it possible to move from the pilot phase to industrial production, with a first demonstration scheduled for 2026 and regular deployments starting in 2028.
The manufacturing plant will be located in Oak Ridge (Tennessee, USA) and will make it possible to produce microreactors in series for various industrial customers and critical infrastructures.
These microreactors use TRISO fuel, encapsulated uranium particles that increase safety and resistance to overheating. Each unit is designed to operate for several years without recharging fuel (approximately 5 years).
Contrary to popular belief, these micro-reactors are secure, scalable and adapted to critical environments, including isolated areas, sensitive industrial sites or military bases. They offer stable, clean and continuous energy production, a real alternative to conventional solutions.
Radiant Nuclear's initiative is part of a global movement towards compact nuclear power. Other startups around the world are exploring similar solutions to meet the growing demand for reliable, low-carbon energy for digital and industrial use.
With this $300 million fundraiser on December 19, 2025, Radiant is positioning itself as a key player in the energy transition, by offering critical infrastructures safe, flexible energy that is independent of conventional networks and is independent of conventional networks.
