ZettaJoule
Updated: August 27, 2026
The team
Country: USA | Add Funding
Founded: 2023
Website: https://zetta-joule.com/
ZettaJoule is developing high-temperature gas-cooled reactor ZJ designed to operate at temperatures up to 950 °C. Its advanced SMR technology builds on decades of proven, safety-tested operations at the High Temperature Engineering Test Reactor in Japan, which has operated since 1998. The startup is modernizing its design to maximize efficiency, lower costs, and power a wide range of applications. Its design leverages artificial intelligence and AI-based digital twins to streamline operations, cut costs, accelerate delivery, and minimize human error.
Founded: 2023
Website: https://zetta-joule.com/
ZettaJoule is developing high-temperature gas-cooled reactor ZJ designed to operate at temperatures up to 950 °C. Its advanced SMR technology builds on decades of proven, safety-tested operations at the High Temperature Engineering Test Reactor in Japan, which has operated since 1998. The startup is modernizing its design to maximize efficiency, lower costs, and power a wide range of applications. Its design leverages artificial intelligence and AI-based digital twins to streamline operations, cut costs, accelerate delivery, and minimize human error.
