An Echogen project in energy storage, funded by the US Department of Energy’s Advanced Research Projects Agency (ARPA-E), was recently featured on CleanTechnica.com. In an article entitled "Energy Storage 2020: It’s Not Just About Lithium-Ion Batteries Any More," Echogen is highlighted in the electricity to heat category:
"Echogen, which specializes in waste heat recovery, will use electricity to heat a low-cost material such as sand or concrete. Later, that heat can be used to raise the temperature of liquid carbon dioxide that has previously been brought to a supercritical pressure. The heated, supercritical carbon dioxide would then expand through a turbine to generate electricity."