ESA calls for bids to build Europe's radioisotope heater plant
ESA opened a tender for a pilot plant to produce Europe's own americium-241 spacecraft heaters, ending reliance on outside suppliers.
what happened
ESA opened a call for tender for the first phase of a "Baseline RHU Pilot Plant" to produce Europe's own americium-241 radioisotope heater units (RHUs), per SpaceNews and AstroSpace.it. The call closes Oct. 23, 2026, and makes up to 4 million euros available; the selected contractor must identify an existing facility in an ESA member state, secure authorization to handle radioactive material, and define how the RHUs will be produced and tested, per AstroSpace.it. The project sits under ESA's ENDURE (European Devices Using Radioisotope Energy) programme, which targets a plant able to produce at least 10 thermal watts of RHU per year from 2029, requiring access to at least 100 grams of americium-241 annually, per AstroSpace.it.
why it matters
RHUs keep spacecraft components warm through deep-space or lunar-night cold, and Europe has no domestic capability to manufacture them today. A sovereign production line reduces ESA's dependence on RHUs sourced from outside Europe for missions like the Argonaut lunar lander, and opens a modestly funded but concrete qualification path for the nuclear-fuel and space-hardware suppliers competing to build the plant.
signal-to-noise
quick facts
- Companies
- ESA
- Category
- procurement
- Impact
- notable
- SNR
- 4 / 5
- Event date
- 2026-09-08
- Published
- 2026-09-09 12:05 UTC