Joule Storage is an energy storage system based on cheap and easily available materials, with a record round-trip efficiency (up to 97%) and a volume per MWh accumulated similar to that of lithium batteries. It can store thermal energy up to 1500 ° C, used by energy-intensive industries (cement plants, chemical factories, metals industries, steam production… ) .
Our system uses granular materials, like sand, which, thanks to a patented configuration, perform the function of electrical resistances, thermal storage, heat exchangers and thermal insulation. In this way, expensive and breakable components are avoided.
Depending on the final use, the system can be designed to store energy for some days, some weeks or some months, with negligible heat losses.