A Nuclear Microreactor Designed for Mars Could Solve EV Charging on Earth

Doug Bernauer didn't set out to become an entrepreneur. He was working at SpaceX, helping solve one of the hardest problems imaginable: how to power a human settlement on Mars.

Then he realized there was a gap no one else was closing. A Mars colony couldn't function without a reactor that could actually fly. And no such thing existed.

"I made a company because I had to," Bernauer told Driving Mobility host Mike Landau.

That company is Radiant. And the technology it built a portable nuclear microreactor called the Kaleido may turn out to have as much impact here on Earth as it ever will on Mars.

What Is the Kaleido?

The Kaleido is the world's first portable, zero-emissions power source capable of operating virtually anywhere. Unlike traditional nuclear power plants massive, fixed, and requiring years to build and license the Kaleido is compact enough to be transported and deployed in remote or underserved locations.

It requires no fossil fuels. It produces no direct emissions. And because it's nuclear, it generates power continuously, without the intermittency that limits solar and wind.

The engineering challenge Bernauer solved was essentially the same whether the application is a Mars colony or a disaster zone: how do you deliver reliable, clean power to a place that has none and do it without a permanent grid?

Applications Closer to Home

The Kaleido's Mars origins make for a compelling story. But the more immediate market is decidedly terrestrial.

Disaster response. When natural disasters strike hurricanes, wildfires, earthquakes they knock out the power grid precisely when it's needed most. Emergency responders, hospitals, and evacuation centers are left dependent on diesel generators that are noisy, polluting, and logistically difficult to fuel. The Kaleido offers a clean, continuous alternative that can be deployed rapidly to where power is needed.

Military installations. The US military operates facilities in remote locations worldwide where fuel supply chains are vulnerable and expensive. A portable, zero-emission reactor that doesn't depend on a logistics tail is a significant operational advantage.

Refugee camps and humanitarian operations. Access to reliable electricity is foundational for clean water, medical care, communication, and safety. In humanitarian settings where grid access is years away, the Kaleido could be transformative.

EV charging infrastructure. Here's where the mobility angle comes into sharp focus. One of the persistent barriers to large-scale EV adoption particularly in rural areas, along long-haul freight corridors, and at remote fleet facilities is the absence of adequate grid capacity. The Kaleido can supply the power an EV charging hub needs without waiting for grid upgrades that can take years to permit and build.

Why This Matters for Fleet Operators

For fleet operators evaluating electrification, the grid is often the constraint. Converting a fleet to EVs is one challenge. Ensuring there's enough power to charge that fleet especially in locations where grid infrastructure is inadequate is another challenge entirely.

A deployable, off-grid power source that can be placed wherever a fleet operates changes the calculus. It means electrification decisions don't have to wait on utility timelines or grid investment cycles. It means remote depots and distributed fleet operations can access clean power independently.

That's not a distant possibility. As Bernauer describes it, the path from Mars power solution to Earth infrastructure is shorter than it sounds.

Demystifying Nuclear

Part of Bernauer's work is simply communication. Nuclear power carries decades of cultural baggage fears shaped by incidents that bear little resemblance to the technology in a compact, modern microreactor.

The Kaleido is not a scaled-down version of a 1970s power plant. Its design is fundamentally different, with passive safety systems that make the failure modes of older nuclear technology structurally impossible.

The same technology developed to keep a Mars colony safe in a context where there is no emergency response coming turns out to be a compelling safety argument for terrestrial deployment as well.

The Bigger Picture

The Kaleido represents something broader than one innovative product: it's evidence that the constraints we assume are fixed the grid must be there before electrification can happen, power requires infrastructure that takes a decade to build are increasingly open to challenge.

The energy and mobility sectors are converging. And the entrepreneurs who are rethinking power from first principles as Bernauer did, starting from "how do I power a Mars colony?" may end up solving problems that conventional energy companies never thought to address.

Listen to the full Driving Mobility episode to hear Doug Bernauer explain how his SpaceX origins led to Radiant, how the Kaleido works, and what the realistic timeline looks like for deployment on Earth.

Driving Mobility is ParkMyFleet's podcast covering the trends, technologies, and leaders shaping the future of mobility.