Antares raises $470 million in a Series C funding round to build and deploy nuclear microreactors for United States military bases — one of the most significant defence-energy crossover investments of 2026. The Torrance, California-based startup, founded in 2023, has now raised over $604 million in total and is racing to meet Washington’s deadline for fielding advanced nuclear power at forward operating locations by 2028.
Key Highlights
- $470 million raised in Series C (July 27, 2026)
- $604 million+ total raised since founding in 2023
- Lead investors: Paradigm and Caffeinated Capital
- Round structure: $370 million equity + $100 million debt
- Reactor output: 100 kilowatts to 1 megawatt per unit
- Target deployment: US military installations from 2028
- Headquarters: Torrance, California
Company Overview
Antares is building what the US military has needed for decades: a compact, portable nuclear power source that operates independent of fragile supply chains. Traditional military bases depend on diesel fuel trucked through vulnerable supply lines. A microreactor deployed to a forward operating base and running for years without refuelling changes the operational calculus entirely. Antares’ Mark-0 microreactor produces 100 kilowatts to 1 megawatt — enough to power a full military installation.
Funding Details
The Series C was co-led by Paradigm and Caffeinated Capital, with participation from Point72 Ventures, Shine Capital, and Industrious Ventures. The $370M equity + $100M debt structure reflects the capital-intensive nature of nuclear hardware manufacturing and mirrors financing used by TerraPower and X-energy.
The Military Nuclear Power Opportunity
The DOD’s Project Pele programme aims to field a mobile nuclear microreactor deployable within 72 hours, with a statutory deadline of 2027–2028. Each gallon of diesel to a forward base in a contested theatre costs an estimated $30–$400 when logistics and security are included — making nuclear power’s long-term economics highly compelling. Antares competes alongside Oklo, Radiant Nuclear, and BWX Technologies for initial DOD contracts.
Technology and Milestones
Antares operates in Torrance, CA; Idaho Falls, ID (adjacent to Idaho National Laboratory); and Aiken, SC. The Mark-0 achieved initial criticality in 2026 under the DOE Reactor Pilot Program — proving the core nuclear design works. Next milestones: electricity generation in 2027, first military site installation in 2028.
Market Opportunity
Advanced nuclear is being driven simultaneously by AI data centre power demand, the clean energy transition, and defence modernisation. Antares targets distributed military and remote power — a segment with no viable diesel alternative, giving it structural pricing power that utility-scale nuclear competitors lack entirely.
Why This Funding Matters
Antares raises $470 million at a moment when energy security is an explicit US national security priority. The convergence of DOD demand, DOE programme support, and top-tier venture capital gives the company a credible near-term deployment path. The $604 million capital stack is itself a competitive moat — very few startups can match it in this sector.
Future Roadmap
With $470 million secured, Antares will complete Mark-0 electricity generation in 2027, secure DOD deployment contracts, and begin first military site installations in 2028. Longer-term commercial applications include data centres in power-constrained markets, remote industrial sites, and disaster resilience infrastructure.
Conclusion
Antares raises $470 million to power US military bases with nuclear microreactors — sitting at the intersection of energy security, defence modernisation, and advanced nuclear technology. With $604 million total raised, a proven reactor design, DOE programme participation, and a 2028 deployment target, Antares is building one of the most strategically important energy startups of the decade. Follow BestStartup US for daily US startup news and venture capital updates.
FAQ
How much did Antares raise in its Series C?
Antares raised $470 million in July 2026, structured as $370 million equity and $100 million debt, co-led by Paradigm and Caffeinated Capital.
What does Antares make?
Antares builds nuclear microreactors producing 100 kilowatts to 1 megawatt for US military bases, eliminating diesel fuel dependency at forward operating locations.
Who invested in Antares?
Paradigm and Caffeinated Capital co-led, with Point72 Ventures, Shine Capital, and Industrious Ventures participating.
When will Antares deploy its first reactor?
Electricity generation from Mark-0 is targeted for 2027, with first military installations beginning in 2028 under the DOD’s Project Pele timeline.
How much has Antares raised in total?
Antares has raised over $604 million in total since founding in 2023, making it one of the best-funded nuclear microreactor startups in the US.
