Zeno Power

Zeno Power builds americium-241 and strontium-90 fueled nuclear batteries, radioisotope Stirling generators that convert heat from decaying radioisotopes into electricity. The company states its units produce from 1 to hundreds of watts and run for years without sunlight, refueling or maintenance. A scaled nuclear prototype was demonstrated at Pacific Northwest National Laboratory in 2023.

Its customers include NASA, which selected Zeno for a Tipping Point award to develop a lunar surface nuclear battery, and the U.S. Navy and Pentagon, which have contracted Zeno for seabed power systems. Zeno is also establishing launch approval pathways for radioisotope power systems for the U.S. Space Force. The company has raised a $20M Series A led by Tribe Capital and a $50M Series B led by Hanaco Ventures.

Zeno Power was incorporated in 2018 and has offices in Seattle and Washington, D.C. It is establishing a nuclear battery manufacturing facility at the Vallecitos Nuclear Center in Sunol, California. The company reported a team of 50 in July 2024, and its careers page lists open roles in engineering, nuclear regulatory, legal, finance, IT and hot cell operations.

Product: Radioisotope Stirling generators and nuclear batteries (radioisotope power systems) for space and seabed applications.