Apollo Atomics

Apollo Atomics is a Cambridge, Massachusetts nuclear-technology company founded by Assil Halimi (CEO) and Drew Walker that shrinks the steam generator—the plant’s thermal-to-electric conversion block—so reactors can be far more compact and factory-built. Instead of multi-storey hand-built generators borrowed from fossil plants, Apollo’s person-scale unit threads coolant and steam loops through needle-thin channels in a metal block for higher heat-transfer efficiency; the company says that enables reactors about 40 times smaller than conventional steam-generator designs and targets factory assembly of plants from roughly 10 MWe to 300 MWe. Apollo has demonstrated a 40 kW reactor with MIT and aims for commercial deployment around 2028, projecting electricity costs competitive with natural gas. In August 2026 it closed a $26 million seed (including about $5 million debt) led by FCVC, with TeleSoft Partners, Y Combinator, Alumni Ventures, Robinhood Ventures, Nucleation Capital, Pelion VC, Duke Capital Partners, New Era Ventures, Orange Collective, Stanford University, E14 Fund and Neutron Power Ventures, to build a demonstration reactor. Sources: TechCrunch 20 Aug 2026; apolloatomics.com.