Micro-reactors are having a moment. For the first time, they're getting more early-stage investment than SMRs.
Earlier this month, Valar Atomics raised a $1bn Series B, the largest micro reactor round ever ($750m of new money). Days earlier, Antares raised $470m, ~$1.2bn into micro-reactors in a single week, pushing them to an all time high and ahead of SMR developers.
Why now?
⚖️ Regulation may finally make the business model possible. Until now regulation effectively prohibited the micro-reactor model. The NRC's proposed Part 57/70/71 rules from May would change that, they’ll let a developer build, fuel and ship a reactor as a sealed product, reform arduous site security and operations requirements, and enable whole fleet licensing with a single application and 6–12 month reviews instead of years.
🛒 Customers are starting to show up. Defence is first: the DoD put up to ~$300m behind BWXT’s Project Pele, while the Air Force selected Oklo to supply power to an Alaska base, subject to licensing. In data centres, Radiant has a binding Equinix preorder, with deposits, for 20 units.
🏛️ Washington has flipped from safety, to safety and innovation. Four vendors: Antares, Valar, Deployable Energy and Aalo, met the DOE’s July 4 criticality challenge. The reactors are still a long way from commercial deployment, but, for the first time in decades, and with strong and bipartisan political backing, the policy posture has clearly shifted toward actively building the industry.
How big is the micro-reactor opportunity?
I see two markets:
1. Replacing diesel. Military bases, mines, O&G fields and remote communities. These customers already pay a premium because they aren’t on the grid. The open question is whether micro-reactor economics can beat diesel once fuel, logistics and financing are included.
2. Powering distributed data centres. I’m sceptical about micro-reactors for today’s giant AI training campuses: at GW scale, economies of scale dominate. But inference could be different. If compute increasingly moves to smaller (~10MW) facilities distributed around towns and cities, micro-reactors’ modularity, siting flexibility and potential deployment speed become much more valuable. That would create a much bigger TAM, and potentially more price-insensitive buyers, giving the industry an order book to take it down the cost curve.
Big caveat: no micro-reactor is operating commercially yet, and both economics and HALEU supply remain unproven. For the full analysis and data, clients can use the link below.