Zeno Power Harmonia Radioisotope Power System

under development

Zeno Power Systems is developing a nuclear battery using a free-piston Stirling engine that converts the decay heat of americium-241 into electricity. The system aims to provide power during the lunar night, especially in permanently shadowed regions of the Moon's south pole. The project includes irradiation testing of organic materials and mechanical components to validate durability in the lunar radiation environment. The system completed its Final Design Review in April 2026 and plans a terrestrial demonstration in early 2027 to achieve Technology Readiness Level 6 for flight qualification.