Clean Heat and Electricity to Power a World of Industrial Applications

ZettaJoule modern building complex with surrounding smaller buildings near a winding river in a green rural landscape.

Our Vision
for the Future

We envision a world where nuclear innovation powers a more sustainable, energy-secure future. Driven by this vision, we are unlocking the full potential of advanced fission technology to deliver clean heat and electricity to industries worldwide.

Isometric illustration of interconnected energy sector elements including factories, storage tanks, ships, planes, buildings, vehicles, and pipelines.

Our Mission

How We Are Reimagining
Clean Energy

To make our vision a reality, we are focusing on deploying a fleet of advanced SMRs that deliver clean, reliable energy at scale. Our approach enables multiple pathways for implementation.

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Flexible Ownership

Customers can choose to own and operate their SMR facilities, or rely on us to fully manage, staff and operate them.

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Seamless Integration

Our SMRs can be incorporated into microgrids to reliably deliver zero-carbon electricity while supplying process heat directly to industrial operations through on-site deployment.

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Global Impact

By deploying a worldwide fleet of SMRs, we will deliver sustainable, scalable solutions that support the global transition to clean energy.

"Amid the global shift toward decarbonization, ensuring a stable energy supply that can reliably meet demand is vital for the sustainable growth of all economic and social activities."
Mitsuo Shimofuji
Co-Founder, President and CEO
of ZettaJoule
Mitsuo Shimofuji, Co-founder, President and CEO,
Board of Directors of ZettaJoule, in a dark suit, blue patterned tie, and pocket square with arms crossed.

How We Began

In 2023, ZettaJoule co-founder and CEO Mitsuo Shimofuji conceptualized an innovative, scalable, clean approach for meeting the rapidly expanding energy demands of industrial and high-tech companies.
Mitsuo Shimofuji
Mitsuo Shimofuji
Co-founder, President and CEO, Board of Directors of ZettaJoule
Jeffrey Harper
Jeffrey Harper
Co-founder, Chief Commercial Officer of ZettaJoule and President of ZROC

Mitsuo assembled the initial co-founding team and, together with Jeffrey Harper and the other co-founders, recruited a vanguard team focused on delivering advanced SMR solutions globally. The team includes Kazuhiko Kunitomi, Ph.D., a leading international authority on high-temperature gas-cooled reactors; Rumina Velshi, a world-class expert on nuclear energy policy, regulation, and innovation; Finis Southworth, Ph.D., a global leader in nuclear R&D, systems science, and analysis; and Andrea Veil, formerly a veteran NRC executive known for transformational leadership.

Meet Our Leaders

Where to Find Us

ZettaJoule has offices in the Washington, D.C. area, in Tokyo and Mito, Japan; and in Houston, Texas - the Energy Capital of the World.
Headquarters
Houston, Texas
Field office
Washington, D.C.
Field office
Tokyo, Japan
Field office
Mito, Japan

Common Questions

Learn More About Us

Our team is led by individuals who have directed multi-billion-dollar projects across the globe. Now united at ZettaJoule, these industry leaders are combining their extensive cross-disciplinary experience in nuclear engineering, advanced reactor design, artificial intelligence, fuel cycles, regulations and licensing, gas turbines, mining, and investment banking to develop innovative nuclear energy solutions for industrial, tech and commercial sectors.

Projections by the U.S. Department of Energy show that annual global energy demand by the year 2050 will reach one billion times one trillion (zetta) units of energy (joules).

Our name ZettaJoule reflects our commitment to being part of the solution for meeting this tremendous need by providing clean, reliable heat and power.

ZettaJoule Inc. is a U.S. company that is developing advanced small modular reactors (SMRs) for deployment in the U.S. and abroad. 

The company’s co-founders are Japanese, American and Canadian. Our team includes leading experts from across the globe who bring a wealth of experience gained while working in many different countries and cultures.

ZettaJoule has offices in Houston, Texas - the Energy Capital of the World – along with offices in Washington, D.C., Tokyo and Mito, Japan.

The company was founded in 2023.

Learn More About Us

Discover what sets us apart, the value of partnering with us, and opportunities to join our dynamic, multi-national team.

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