Nucleation's portfolio company, Apollo Atomics, emerged from stealth this week alongside an oversubscribed $31 million seed financing, with a thesis that targets a component most reactor developers leave alone: the steam generator.
Conventional steam generators are multi-story structures, hand-built on site, and they drive a substantial share of the size and cost of a nuclear plant. Apollo, an MIT spinoff founded by Assil Halimi and Drew Walker, has redesigned the component as a compact, factory-manufactured unit roughly the size of a person, threading coolant and water loops through a metal block laced with needle-thin channels for far more efficient heat transfer. The result is a steam system 20x smaller than conventional equivalents and an 80% reduction in overall plant size at the same power output.
Critically, Apollo pairs that innovation with proven pressurized water reactor technology, commercially available fuel, existing supply chains and familiar regulatory pathways. The company's fuel has achieved criticality at full power and it is now pursuing NRC commercial approval, drawing on more than fifteen years of MIT research and testing. Apollo is targeting deployment in under two years, against a conventional timeline of a decade or more, with three reactor sizes spanning 10 to 300 MW and commercial interest totaling 20 GW from data center builders, university campuses and industrial offtakers.
The round was led by FCVC, with participation from Nucleation Capital, Y Combinator, Telesoft Partners, Pelion VC, Alumni Ventures, Duke Capital Partners, Stanford University, the E14 Fund and others. Apollo's launch was covered in an exclusive by TechCrunch.
