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Milestone for Zeno Power’s space nuclear battery

April 21, 2026, 3:58PMNuclear News
The Harmonia RPS for Artemis Tipping Point's electrical heat source subassembly engineering unit prior to thermal vacuum chamber testing. (Photo: Zeno Power)

Earlier today, Zeno Power announced the completion of the final design review for its americium-241–fueled radioisotope power system (RPS), called Harmonia, which was developed for one of NASA’s Tipping Point projects for Artemis.

The project will now begin the build and fabrication phase. The company plans to complete a terrestrial demonstration of the system in early 2027 and is aiming for flight qualification for lunar missions beginning in 2028.

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