Apollo Atomics aims to cut nuclear power costs by shrinking steam generators
MIT-spinoff startup targets reactors 40x smaller than conventional plants with its compact heat exchanger design.
1The nuclear cost challenge
While the nuclear industry is experiencing renewed interest, advanced reactors remain far from cost-competitive. Apollo Atomics founders Assil Halimi and Drew Walker believe companies have been solving the wrong problem. Instead of new reactor designs, they're reimagining how thermal energy converts to electricity, focusing on the often-overlooked steam generator component.
2Steam generator breakthrough
Apollo's innovation centers on steam generators - typically the largest and most labor-intensive part of nuclear plants. Conventional generators stand several stories tall and require hand assembly, while Apollo's mass-producible version is human-sized. This allows reactors 40 times smaller than conventional designs.
3Technical specifications
Traditional steam generators run reactor coolant through large tubes surrounded by water. Apollo's design threads both fluid loops through a compact metal block laced with needle-thin channels. This configuration improves heat transfer efficiency, enabling dramatic size reduction while maintaining performance.
4Factory assembly advantage
The compact design enables factory assembly rather than on-site construction. Apollo claims this approach will allow building a 300-megawatt plant in under 24 months - significantly faster than conventional nuclear projects. The company estimates production costs 4-5 times lower than existing reactor designs.
5Cost and efficiency targets
CEO Halimi projects Apollo plants can generate electricity at 3 cents per kilowatt-hour, aiming to undercut natural gas economically. The design maximizes utilization of nuclear fuel's high energy density, addressing inefficiencies in current steam generators that borrow from fossil fuel plant designs.
6Funding and roadmap
Apollo recently closed a $26M seed round to build a demonstration reactor ahead of planned 2028 commercialization. The funding was led by FCVC with participation from Y Combinator, MIT-affiliated funds, and other VCs. The startup plans to offer reactor sizes ranging from 10 to 300 megawatts.
7MIT technology transfer
Apollo's technology stems from MIT research, where the team built a 40-kilowatt prototype reactor. Halimi's academic background in nuclear technology strengthens the company's scientific foundation. The project represents a successful case of academia-industry collaboration in deep tech commercialization.
8Industry implications
Apollo's innovation could enhance nuclear power's role in clean energy transitions. Small modular reactors (SMRs) like Apollo's can be deployed faster than conventional plants. This technology promises to overcome nuclear's cost barriers while delivering reliable, carbon-free electricity at competitive prices.