Antares lands a $161 million U.S. Air Force award to push its space nuclear reactor program closer to deployment
With 2026 coming to an end, many countries are starting to evaluate the amount of progress that they have made toward achieving their long-term clean energy objectives, which they want to meet within the set deadline. The United States has established itself as a renewable energy powerhouse. The nuclear sector is one that many industry experts believe will be integral to the United States’ long-term renewable energy generation, considering the amount of access and resources that the nation has related to nuclear generation. Recently, Antares landed a $161 million U.S. Air Force award to push its space nuclear reactor program closer to deployment.
Analyzing Antares’s role in shaping the United States’ nuclear energy landscape
The United States is not short on companies that are actively seeking to shape the future of the nuclear sector and be at the forefront of establishing groundbreaking projects that will enhance the country’s overall nuclear capacity. Among such companies is Antares, a nuclear startup founded in 2023 and based in Torrance, California. The company has developed a reputation for building factory-produced, transportable fission microreactors for defense, space, and remote terrestrial applications.
It is backed by over $600 million in total funding, including major venture investments from firms like Shine Capital, which is massive given its ability to successfully execute projects. The company’s core technology and products include an R1 Microreactor, which is a modular power solution designed for austere or contested environments, producing between 100kWe and 1 MWe of electricity.
The company is also expected to power an operational ground-to-space asset with Mark-1, its electricity-producing reactor, which is scheduled for testing in 2027.
One step closer: Antares lands a $161 million U.S. Air Force award for its space nuclear reactor program
According to a press release from Antares, the company has officially been selected by the Office of the Assistant Secretary of the Air Force for Space Acquisition and Integration for a Strategic Breakthrough award to advance nuclear power for space. This is a massive achievement because there was a wide range of options to choose from, but the company stood apart from the rest.
The award reflects the largest current Department of War award in space nuclear power. The huge amount of money involved in the initiative shows how integral the nuclear sector is to clean energy development and how developers feel they are set to benefit massively from it.
Some people were left surprised about the project being space-oriented, but Jordan Bramble, who is the CEO, stressed that space has been at the heart of the company’s thesis ever since it was established. The newly reached partnership with the Space Force turns the company’s long-term vision into a codified space mission.
Understanding the importance of Antares’s nuclear reactor program
When the project was first announced, there were question marks about what it means for the nuclear sector and its advancement. Through the program, Antares will perform a nuclear ground demonstration of the R1-S and integrate it with a spacecraft for flight certification prior to launch.
The company is also expected to power an operational ground-to-space asset with Mark-1, its electricity-producing reactor, which is scheduled for testing in 2027. One of the reasons why Space nuclear has been important to the company since the beginning is because it removes propulsion restrictions for the Space Force, allowing spacecraft to maneuver without regret and carry out dynamic operations that were once seen as impossible.
Antares takes a massive stride as a leader in nuclear energy production
On June 4, 2026, Antares’s Mark-0 microreactor achieved initial criticality at Idaho National Laboratory under Department of Energy authorization, making Antares the first private company to bring an advanced reactor to criticality under the DOE Reactor Pilot Program. The company’s Mark-1 reactor is scheduled to operate for more than six months in 2027, integrated with its nitrogen closed Brayton cycle power conversion system.
The company’s CEOs are Jordan Bramble and Julia DeWahl. Since its establishment, it has grown to open facilities in Idaho Falls, Idaho, and Aiken, South Carolina, further increasing its chances of becoming involved in multiple projects at once.
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