Antares pays Centrus up front for HALEU deliveries that start before the end of the decade

The officer answering for power at Joint Base San Antonio is buying two things at once: a machine that makes electricity, and a fuel line that keeps it making electricity for years. Antares Nuclear has been selected for the Air Force's Advanced Nuclear Power for Installations program at that base, and for the Army's Janus Program at Fort Bragg, North Carolina ^[8]. The Centrus contract covers the second thing.

The dates do not line up neatly. Antares is targeting electricity production from an advanced reactor in 2027, with initial production deployments at US military installations planned to begin in 2028 ^[13]. Deliveries under the Centrus contract are expected to begin before the end of the decade ^[2]. Taken at the outer bound of 2030, contracted fuel arrives as much as two years after those first deployments are meant to start ^[14]. Either the delivery date lands well inside that window, or early units run on fuel from somewhere else.

The prepayments are the part a procurement reader should look at twice. Antares pays before the fuel exists, and that money supports Centrus' expansion of HALEU production in the United States ^[3]. Centrus launched a multi-billion-dollar expansion last year covering HALEU and conventional low-enriched uranium, and says binding orders are supporting the move toward commercial-scale output ^[10]. "This contract is another sign that demand for HALEU is real and it is accelerating, and Centrus is in prime position to meet this need," said Amir Vexler, president and CEO of Centrus ^[7]. Volume, price and the size of the prepayments are not in the report, nor is any government contribution to the expansion ^[15].

HALEU is enriched above 5 percent and below 20 percent, giving it more uranium-235 than conventional low-enriched uranium; developers use it because it supports smaller and more energy-dense reactor designs ^[5]. Centrus says its AC100 centrifuge is designed for what it calls unobligated enrichment, so the resulting uranium can be used for US national security missions without foreign-use restrictions ^[11]. For a customer whose sites are an Army post and an Air Force base, that decides which suppliers are eligible at all. Centrus makes HALEU at the American Centrifuge Plant in Piketon, Ohio, which it describes as the only licensed HALEU production facility in the Western world ^[9].

"Fuel supply is one of the practical questions every advanced reactor developer has to answer," said Jordan Bramble, CEO and co-founder of Antares. "This contract gives Antares a reliable, U.S.-origin source of HALEU for the reactors we're deploying for a wide variety of defense and space customers." ^[6] Antares reached initial criticality with its Mark-0 microreactor in 2026 under the Department of Energy's Reactor Pilot Program ^[12].

Two yes/no items separate a microreactor pitch from a microreactor program: whether the unit has gone critical, and whether fuel is under contract with a named enricher and a delivery window. Antares can now answer yes to the first and yes-with-a-wide-window to the second ^[12][2]. The bid to price carefully is the one with a demonstration unit and a fuel plan still sitting at letter-of-intent stage.