Science & Tech · Science & Environment · 8 hrs ago
Iron powder could help store renewable energy and reuse coal plants
Researchers at Karlsruhe Institute of Technology studied iron powder as a way to store renewable energy and generate electricity.
Burning the powder produces heat and rust; renewable hydrogen can remove oxygen from the rust, restoring iron for reuse.
The process could reuse parts of existing coal power plants, including turbines and grid connections, although heat-generating equipment would need changes.
In computer models of a climate-neutral European energy system through 2050, iron-fired plants appeared in the lowest-cost system in every scenario examined.
Iron could help during long renewable-energy shortages, especially in places with little hydropower or few suitable sites for underground hydrogen storage.
It could also be transported and stored more easily than hydrogen, but the study did not find that iron would replace hydrogen.
Its future depends on unresolved technical and economic questions, and the available information does not specify what happens next.
A study from the Karlsruhe Institute of Technology says iron powder could store renewable energy and help repurpose existing coal power plants.
The process burns iron powder to produce heat and iron oxide, then uses renewable hydrogen to restore the iron for reuse.
Researchers’ models found iron-fired power plants in the lowest-cost climate-neutral European energy system in every scenario they examined through 2050.
The study says iron could help supply electricity during long periods of weak wind and sunlight, especially where hydropower or underground hydrogen storage is limited.
The researchers say iron would complement, not replace, hydrogen, and its future depends on unresolved technical and economic questions.
- Who
- Researchers at the Karlsruhe Institute of Technology (KIT).
- What
- They studied using recyclable iron powder to store renewable energy and potentially convert coal power plants to iron-firing.
- When
- The study was published on November 10, 2026; the models examined Europe’s energy system through 2050.
- Where
- Europe, including existing coal power plants and regions with limited hydropower or underground hydrogen storage.
- Why
- Iron could store renewable energy for periods of low wind and sunlight and use existing power plant infrastructure.
This story does not have two clearly opposing sides.
KIT researchers simulated the development of a climate-neutral European energy system, comparing iron with other storage and power technologies.
SciTechDaily published an article about the KIT study.
- Research institution
- Karlsruhe Institute of Technology (KIT)
- Model horizon
- Through 2050
- Fuel cycle
- Burning iron powder produces iron oxide; renewable hydrogen restores it to iron
- Model result
- Iron-fired power plants appeared in the lowest-cost system in every scenario examined
- Potential use
- Repurposing existing coal power plants for iron-firing
What people are saying
This works in a cycle that emits no carbon dioxide or environmentally harmful substances.
When burned, iron powder behaves very much like coal. We wanted to find out whether it was possible to repurpose existing coal power plants to iron-firing.
Iron might play a very special, but economically meaningful role for reaching climate-neutrality and in reliably making renewables available.