Harmonia radioisotope power system
Nuclear battery that powers Moon equipment through the lunar night
Zeno Power
Builds nuclear batteries that turn heat from decaying radioactive material into steady power for years, so Moon equipment can survive the two-week lunar night and seabed sensors can run for long stretches.
Products, by altitude
The Moon · 384,400 km from Earth
In development In development ![]()
Survive-the-Night Package
Nuclear heater that keeps Moon electronics warm overnight
Known rounds
| Date | Round | Amount | Led by |
|---|---|---|---|
| May 2025 | Series B | $50M | Hanaco Ventures1 |
Government awards
| Date | Agency | Program | Amount |
|---|---|---|---|
| Jul 2023 | NASA | Tipping Point (Harmonia radioisotope power system for lunar applications) | $15M2 |
Milestones
- Aug 2026 Signed a payload agreement with Firefly Aerospace to fly an americium-241 heater unit on a Blue Ghost lunar mission no earlier than 2028. Company statement3
- Jun 2026 Announced a nuclear battery manufacturing site in restored hot cells at the Vallecitos Nuclear Center in Sunol, California, with first deliveries to government customers planned for 2027. Company statement4
- Apr 2026 Completed the final design review for the Harmonia lunar nuclear battery under NASA's Tipping Point program. Company statement5