Apollo Atomics Raises $26 Million to Lower Nuclear Power Costs by Redesigning Steam Generators

Apollo Atomics, an advanced nuclear startup founded by Assil Halimi and Drew Walker, has raised $26 million in seed funding to redesign the steam generator, a critical component in nuclear power plants that converts thermal energy into electricity.

What Happened

Rather than designing an entirely new nuclear reactor from scratch, Apollo Atomics is focusing its efforts on shrinking the steam generator. In standard nuclear facilities, steam generators are typically several stories tall, hand-assembled on site, and adapted from designs originally developed for fossil fuel plants such as coal and natural gas. Apollo Atomics has developed a system based on Massachusetts Institute of Technology (MIT) research that shrinks this unit to roughly the size of a human.

According to CEO Assil Halimi in an interview with TechCrunch, standard steam generators run reactor coolant through large tubes submerged in water. Apollo’s design instead directs fluid loops through a compact metal block integrated with needle-thin channels. This configuration enables more efficient heat transfer and allows the entire reactor system to be up to 40 times smaller than plants using traditional steam generators.

The company announced a $26 million seed round that includes $5 million in debt. The funding round was led by FCVC, with participation from 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.

Key Highlights

• Compact Architecture: Apollo’s steam generator is engineered to be human-sized and mass-manufactured, creating a power plant system footprint 40 times smaller than traditional setups.
• Capital and Backing: The startup raised a $26 million seed round comprising equity and $5 million in debt, led by FCVC with participation from Stanford University and several venture funds.
• Cost and Speed Targets: The company projects power generation at 3 cents per kilowatt hour and aims to build a 300-megawatt plant in under 24 months, with reactor production costs four to five times lower than current designs.
• Testing Underway: Apollo has already constructed a 40-kilowatt demonstration reactor at MIT to validate the underlying technology.
• Planned Capacities: The startup intends to provide three system sizes, ranging from 10 megawatts-electric to 300 megawatts.

Why This Matters

Cost competitiveness remains a significant barrier for modern nuclear concepts. Current projections indicate that many advanced reactors may struggle to compete economically against traditional sources. Traditional fossil fuels have lower energy densities than nuclear fuels like uranium, yet current nuclear generators still rely on large, legacy industrial designs that fail to capitalise fully on nuclear fuel density.

By significantly reducing the size of the generator, Apollo plans to assemble both the reactor and generator in a factory rather than constructing them on-site. This shift aims to reduce labour expenses and dramatically shorten construction timelines, directly targeting electricity generation rates capable of competing with natural gas.

What to Watch Next

Apollo Atomics intends to utilise its new seed capital to build an advanced demonstration reactor. This project is intended to pave the way toward a commercial deployment target set for 2028 across its planned commercial offerings.

Frequently Asked Questions

What component is Apollo Atomics redesigning?

The startup is redesigning the steam generator, the large component responsible for transferring thermal energy from the reactor’s coolant loop into steam to spin an electricity-generating turbine.

How does the new design achieve a smaller footprint?

Instead of relying on large tubes surrounded by water, the startup threads two fluid loops through a compact metal block containing needle-thin channels, which facilitates more efficient heat transfer.

When does Apollo Atomics plan to launch commercially?

The company has scheduled commercial deployment of its technology for 2028 following the construction of its demonstration reactor.

Source: TechCrunch