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US nuclear startup Antares raises $96m series B

Antares, a US-based nuclear startup, has raised US$96 million in series B funding to advance its small modular reactor design.

The round included US$71 million in equity and US$25 million in debt, led by Shine Capital, with participation from Alt Capital, Caffeinated, FiftyThree Stations, Industrious, and others.

Antares is developing the R1 microreactor, which aims to generate between 100 kilowatts and 1 megawatt of electricity using TRISO fuel.

Antares was selected in August for the US Department of Energy’s reactor pilot program, which seeks to have at least three small reactors operating by July 2026.

The company plans to demonstrate its reactor for the DOE next year, and aims to start its full-power reactor in 2027.

🔗 Source: TechCrunch

🧠 Food for thought

Implications, context, and why it matters.

DOE pilot timelines hinge on unconfirmed regulatory pathways

  • Antares targets a 2027 full power reactor, yet the DOE pilot deadline in July 2026 leaves open the path, DOE authorization or NRC licensing 1. INL contracts could make it the first privately funded advanced reactor to produce power in the U.S. in 2027, if that path stays on track 2.
  • DOE authorization covers R&D, not commercial demos, and approved designs can move faster into NRC licensing later (NRC licensing is the pathway required for commercial power generation) 1.
  • Pre-application materials from Antares went to the NRC (an early step to clarify needs and cut review risk) 3. The article omits how it links to DOE authorization or NRC licensing, or which path its 2026 to 2027 milestones use 3.
  • Agencies plan coordination among DOE, U.S. Department of Defense (DoD) and NRC to prevent regulatory overlap, yet shift from DOE authorization to NRC licensing remains unclear 1.

Military microreactor procurement creates immediate vendor opportunities

  • The U.S. Army’s Janus Program seeks microreactors at nine bases by 2030 4. The solicitation closed on December 15, 2025, with follow-on production deals and power purchase agreements after prototypes 4. The Army will use milestone based Other Transaction Agreements (OTAs) for prototyping, with fixed price terms to cut admin overhead 4.
  • That plan creates work for EPC firms, site hosts, plus microgrid integrators 4. Eight companies can supply microreactors under the Advanced Nuclear Power for Installations (ANPI) program 5. Third party providers should watch DOE and military microreactor RFPs, since the Army plans to expand beyond the first nine 6.

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