Matt Loszak: Current nuclear reliance on light water reactors limits innovation, alternative coolants can boost efficiency, and breeder reactors are key to sustainable energy | Macro Voices

Modular nuclear reactors could revolutionize AI data centers by overcoming traditional scalability and efficiency barriers.

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Add us on Google by Editorial Team Mar. 25, 2026

Key takeaways

• The current reliance on light water reactors limits the potential for nuclear power development.
• Bespoke reactor designs have historically led to cost overruns and delays in the nuclear industry.
• Switching to alternative coolants like sodium and molten salt can significantly enhance reactor efficiency.
• Institutional investors prefer proven nuclear technologies, posing a barrier to innovation.
• Advanced reactors have a significant but often overlooked operational history.
• Political factors have historically hindered the exploration of certain reactor technologies.
• Breeder reactors are essential for scaling nuclear energy to replace fossil fuels.
• Breeder reactors can utilize more abundant fuels, extending the usable fuel lifespan.
• The transition to breeder reactors and recycling spent nuclear fuel is inevitable in the coming decades.
• Most mined uranium is not effectively utilized, highlighting inefficiencies in current practices.
• Advanced nuclear technologies face skepticism from investors due to their unproven status.
• The nuclear industry’s reliance on bespoke designs has hindered scalability and efficiency.
• Political influences have played a significant role in the development of nuclear technology.
• Breeder reactors offer a sustainable solution by utilizing more abundant fuel sources.
• The future of nuclear energy lies in adopting breeder reactors and improving fuel recycling.

Guest intro

Matt Loszak is the founder and CEO of Aalo Atomics. He is a former software entrepreneur who previously built a successful HR software business. Aalo Atomics is developing factory mass-manufactured modular nuclear power plants, called Alo-pods, to power AI data centers at scale.

The limitations of current nuclear reactor designs

• The reliance on light water reactors represents a local maxima, not a global maxima in nuclear power development.

• If we had to boil it down, I’d say it’s that essentially the current solution is a local maxima but not a global maxima.

  — Matt Loszak

• Bespoke reactor designs have led to cost overruns and delays historically.

• The problem is that you have an industry where every reactor that’s been built in the past seventy-five years is bespoke; they’ve been one-off projects.

  — Matt Loszak

• The nuclear industry needs to reconsider its approach to reactor design for better efficiency.
• Understanding the distinction between local and global maxima is crucial for reactor design.
• The current design approach limits the potential for innovation in nuclear technology.
• Reevaluating reactor designs could lead to more cost-effective and scalable solutions.

The potential of alternative coolants in nuclear reactors

• Switching from water to sodium and molten salt can significantly increase energy output.

• The reason to switch off of water is essentially this emergent realization when you start to explore and ask yourself what is the best design to mass manufacture.

  — Matt Loszak

• Alternative coolants allow for smaller reactor vessels and higher energy efficiency.

• Sodium and molten salts allow you to make the vessel of the reactor much smaller… you’d get around anywhere from two to 10 times more energy out of it.

  — Matt Loszak

• Current water-based reactors have limitations that alternative coolants can overcome.
• Exploring new coolant options is key to improving reactor design and safety.
• The use of alternative coolants could revolutionize the nuclear industry.
• Sodium and molten salt offer promising solutions for future nuclear reactor designs.

Challenges faced by advanced nuclear technologies

• Institutional investors are hesitant to invest in unproven nuclear technologies.

• One of the most commonly held views among institutional investors is look we don’t wanna invest in science projects.

  — Matt Loszak

• Investors prefer solutions that are already proven and commercially deployable.
• This skepticism poses a significant barrier to the advancement of innovative nuclear technologies.
• The investment landscape in nuclear energy is challenging for startups seeking funding.
• Overcoming investor skepticism is crucial for the development of advanced reactors.
• Proven technologies are favored, limiting opportunities for emerging innovations.
• The nuclear industry must address investor concerns to drive technological progress.

The overlooked history of advanced reactors

• Advanced reactors have a significant operational history that is often ignored.

• A lot of people don’t realize that advanced reactors actually do have quite a bit of operational history.

  — Matt Loszak

• Water-cooled reactors have thousands of cumulative years of operational history.
• Sodium reactors have around four hundred operational years of history.
• This operational data is crucial for informed discussions about reactor viability.
• Understanding the history of reactor development is key to future advancements.
• The existing operational history supports the case for advanced reactor technologies.
• Recognizing this history can help overcome skepticism about advanced reactors.

Political influences on nuclear technology development

• The lack of exploration into certain reactor technologies was largely due to political reasons.

• My belief is that it was largely for political reasons if you look at the history that these reactors did not get further explored.

  — Matt Loszak

• Political factors have historically hindered the advancement of nuclear technology.
• Understanding the political context is essential for addressing current challenges.
• Political influences have shaped the trajectory of nuclear reactor development.
• Overcoming political barriers is crucial for the future of nuclear energy.
• The nuclear industry must navigate political landscapes to drive innovation.
• Recognizing these influences can help in strategizing future technological advancements.

The role of breeder reactors in sustainable energy

• Breeder reactors are essential for scaling nuclear energy to replace fossil fuels.

• We’re never gonna really and truly change the world and be able to scale nuclear up enough to replace fossil fuels until we get to something called a breeder reactor economy.

  — Matt Loszak

• Breeder reactors can utilize more abundant fuels, extending the usable fuel lifespan.

• If you can do a breeder it unlocks different fuels still in a nuclear reactor like thorium and uranium two thirty eight which are both much more abundant than u 235.

  — Matt Loszak

• They offer a sustainable solution by utilizing more abundant fuel sources.
• Breeder reactors are key to making nuclear energy a viable long-term solution.
• The adoption of breeder reactors is critical for the future of nuclear energy.
• They provide a path to sustainable and scalable nuclear energy production.

The inevitability of transitioning to breeder reactors

• The transition to breeder reactors and recycling spent nuclear fuel is inevitable.

• That’s essentially how we see it is it’s an inevitable move that’ll happen in the coming probably couple decades.

  — Matt Loszak

• Current economic factors favor existing reactor technologies for immediate needs.
• The future of nuclear energy lies in adopting breeder reactors and improving fuel recycling.
• This transition is necessary to meet growing energy demands sustainably.
• Understanding the current state of nuclear technology is key to this transition.
• The inevitability of this transition highlights the need for technological advancements.
• Breeder reactors will play a crucial role in the future energy landscape.

Inefficiencies in current uranium utilization

• Most mined uranium is not being utilized effectively, highlighting inefficiencies.

• Less than 1% of uranium that’s mined out of the ground is u 235… the other 99.3% is u 238.

  — Matt Loszak

• U-238, which could be used as fuel in breeder reactors, is largely wasted.

• We’re literally creating so-called nuclear waste… really it’s perfectly good nuclear fuel that we could have used to make energy.

  — Matt Loszak

• This inefficiency underscores the need for improved nuclear fuel practices.
• Breeder reactors offer a solution to better utilize available uranium resources.
• Addressing these inefficiencies is crucial for sustainable nuclear energy.
• The potential for improvement in uranium utilization is significant for the industry.

Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our Editorial Policy.