Antares Nuclear Secures $470 Million to Advance Small Modular Reactors for U.S. Military
Nuclear power startup Antares Nuclear announced on Monday that it has successfully raised $470 million in funding aimed at developing small modular reactors (SMRs) for deployment on U.S. military bases. This significant capital injection highlights the growing investor enthusiasm surrounding advanced nuclear technologies, particularly as demand surges for reliable, clean energy sources to support expanding infrastructures such as AI data centers.
Funding Round and Investor Interest
The Series C funding round was led by Paradigm and Caffeinated Capital, with additional investments from Industrious Ventures, Point72 Ventures, and Shine Capital. The round combined $370 million in equity and $100 million in debt financing. This wave of investment reflects a broader trend toward nuclear startups, driven by the necessity for new power generation methods amid rapid electrification and the rise of energy-hungry data centers.
Antares’ Reactor Technology and Capabilities
Antares is focused on developing a compact SMR capable of generating between 100 kilowatts and 1 megawatt of electricity—enough to power approximately 750 homes. Central to its design is the use of TRISO fuel, a technology that encapsulates uranium particles within carbon and ceramic shells. This fuel form has been recognized for its enhanced safety profile compared to traditional nuclear fuels, as the coatings prevent melting even under high-temperature reactor conditions. The TRISO fuel spheres, roughly the size of billiard balls, can be cooled by inert gases such as helium or by molten salts, enabling safer and more efficient reactor operation.
Antares’ demonstration reactor, known as the Mark-0, achieved criticality on June 4 at the Idaho National Laboratory, marking a major milestone in the company’s development timeline.
Strategic Military Partnerships and Deployment Plans
The company stands as one of three finalists in the Pentagon’s Advanced Nuclear Power for Installations program, an initiative aimed at testing SMRs on Air Force bases in Colorado and Montana. Antares plans to bring its first electricity-producing reactor online as early as next year, with broader deployment across U.S. military installations targeted for 2028. The U.S. military, known for its strategic interest in resilient and autonomous power supplies, represents a key market for early adoption of these advanced reactors, which may not yet be cost-competitive in the commercial sector.
Industry Context and Market Challenges
Investment interest in nuclear fission technology is at an all-time high. Other notable players in the sector include X-energy, which raised $1 billion through an IPO earlier this year, and startups like Radiant Energy, Standard Nuclear, and Last Energy, each having secured substantial nine-figure funding rounds since late 2025. Antares itself closed a $96 million Series B round last December, bringing its total funding to approximately $604 million, according to a TechCrunch analysis of PitchBook data.
Despite this influx of capital and enthusiasm, advanced nuclear startups face significant barriers. The U.S. supply chain for nuclear components remains underdeveloped, and scaling production to mass-manufacturing levels—a key promise for cost reduction—remains a decade away from fruition. Moreover, initial SMRs entering service in the early 2030s are expected to have high levelized costs of energy (LCOE). According to Lazard, new SMRs may cost around $214 per megawatt-hour, making them more expensive than most gas turbine power plants, except the most costly.
Outlook and Strategic Focus
Antares has not publicly disclosed its reactor pricing, but the decision to focus on contracts with the U.S. military aligns with the reality that early adopters of advanced nuclear technology will likely be customers less sensitive to cost. Military installations require reliable, secure, and independent power sources, making them ideal partners for pioneering SMR deployments.
As the nuclear startup ecosystem matures, Antares and its peers will continue to navigate technical, regulatory, and economic challenges. Their progress will be pivotal in determining the role of advanced nuclear power in the broader energy transition and the future of decentralized, resilient energy systems.
When you purchase through links in our articles, we may earn a small commission. This doesn’t affect our editorial independence.
Source: Here
