Antares, a pioneering nuclear startup, has announced a significant $96 million Series B funding round to advance its innovative small modular reactor (SMR) designs. This substantial investment, comprising $71 million in equity and $25 million in debt, will fuel the development of microreactors intended for a wide array of applications, including commercial, defense, and space-based power solutions. The funding arrives as global interest in nuclear power experiences a notable resurgence.
The round was led by Shine Capital, with additional participation from Alt Capital, Caffeinated, FiftyThree Stations, Industrious, and other investors. Antares aims to deploy its R1 microreactor, which is designed to produce between 100 kilowatts and 1 megawatt of electricity, across these diverse sectors. A key component of its design is the use of TRISO fuel, which, in Antares' configuration, consists of carbon- and ceramic-coated uranium spheres meticulously embedded in graphite. For more information, visit Antares Industries.
Antares' successful fundraising underscores a broader trend of renewed investment and enthusiasm for nuclear energy over the past six months. This "nuclear renaissance" is attracting significant capital and attention from both private and public sectors.
Several other companies in the advanced nuclear sector have also recently secured substantial funding. Last week, Amazon-backed X-energy announced a $700 million Series D round, following an equally large Series C round in February. X-energy is also developing reactors based on TRISO fuel technology. Deep Fission, another nuclear startup that faced fundraising challenges earlier in the year, went public in September through a $30 million reverse merger. Furthermore, Aalo Atomics raised $100 million in August to construct a demonstration data center powered by a microreactor, while Nvidia contributed to a $650 million round in June for TerraPower, a small modular reactor startup notably backed by Bill Gates.
The renewed interest isn't limited to small modular reactors; traditional large nuclear plants are also experiencing a comeback. Earlier this month, Constellation Energy, a Microsoft partner, secured a $1 billion loan from the Department of Energy to restart a reactor at Three Mile Island by 2028, a project estimated to cost $1.6 billion for refurbishment. In October, Google partnered with NextEra Energy to reopen a nuclear power plant in Iowa that had been damaged in 2020. Major tech companies are also directly investing in nuclear capacity: Amazon purchased 1.92 gigawatts of generating capacity from a Talen Energy nuclear plant in Pennsylvania earlier this summer, and Meta announced in June its plan to acquire clean energy attributes from a Constellation Energy nuclear power plant in Illinois.
The U.S. government has expressed strong support for the potential of small nuclear reactors to revitalize the industry in the coming decade. Reflecting this commitment, Antares was selected in August as one of 11 participants in the Department of Energy’s reactor pilot program. This ambitious program aims to have at least three reactors operational by July 4, 2026—a significantly accelerated timeline compared to traditional nuclear development. Antares itself plans to demonstrate its reactor for the DOE next year, with its full-power reactor projected to become operational sometime in 2027.
