Cheap, clean energy available at all times

Developing tools to ensure network resilience

Our technology stores electricity by melting ferrosilicon alloys at temperatures over 1000ºC. This heat can be stored for extended periods of time and recovered back to electricity using thermophotovoltaics. This innovative approach delivers both heat and electricity on demand, solving the current threats of uncertain supply and enabling a clean, sustainable future.

Features and advantages

Our technology has proven to be:


No need for complex heat exchangers and transfer fluids


 Made of abundant, low-cost materials


Low-pressure storage and use of non-hazardous materials


High energy density enabling smaller sizes


Solid state heat engine with no moving parts


With modules that can be configured to meet any load


The end-user can optimise the energy flux


Built with non-toxic, reusable materials

The latent heat thermophotovoltaic battery design

Surpassing all current technologies both in performance and reduced costs

Our system consists of a thermophotovoltaic (TPV) generator connected to a tank filled with a combination of metals, and an electric furnace. Using surplus energy from renewable sources the furnace generates heat melting the metals at a temperature of around 1000ºC. Remaining in this state for long periods of time (over several days) these now incandescent metals emit large amounts of photons. This thermal radiation holds the key to converting the heat back into electricity. Operating like a solar cell with a twist the TPV generator can be inserted, converting thermal radiation into electricity, or retracted to stop the discharge, allowing the system to operate only when needed.

Heat as a by-product

Satisfying heating needs both at a residential and industrial level

To operate at optimal functional temperature (lower than 80ºC) our system’s TPV generators must be cooled. During this process, low-temperature heat is generated with a variety of potential uses. Often underappreciated in the energy landscape, thermal heat comprises more than half of the global energy demand – two to three times more than electrical needs – and since most of it comes from the burning of natural gas, it contributes heavily to global CO2 emissions. Our battery output temperature could tackle approximately 64 % of all the EU heating needs: corresponding to space heating, domestic hot water, and to low-temperature industrial processes.