Who invested in Zetta Joule?

Investors on record for Zetta Joule: HAX.

Who founded Zetta Joule?

Zetta Joule was founded by Jeffrey Harper and Mitsuo Shimofuji.

Advanced small modular reactors built on proven HTGR technology, delivering up to 950°C clean heat and electricity for industrial applications.

Website: zetta-joule.com.

Categories: Climate and energy Manufacturing and industrial.

Domain age: 3 years.

On Recent Funding since: Oct 11, 2026.

About Zetta Joule

Recent Funding lists Zetta Joule under Climate and energy (also Manufacturing and industrial). It went through HAX (HAX 2024). It was founded by Jeffrey Harper and Mitsuo Shimofuji.

Questions and sources

Who invested in Zetta Joule?: Investors on record for Zetta Joule: HAX.
Who founded Zetta Joule?: Zetta Joule was founded by Jeffrey Harper and Mitsuo Shimofuji.

Every amount links to the page it came from. * Estimated from an accelerator's published standard deal, not a company-specific disclosure. How Recent Funding sources and verifies funding data. The same data as JSON: /api/v1/companies/zetta-joule (get a free API key).