Storing energy is a huge challenge in the fight to reverse global warming. A couple of UK engineers are working on part of the solution using gravel.Reuters Reports:
"Some energy storage technologies for the power grid are expensive but can be deployed anywhere, like advanced batteries, while others are cheap but can only be built in certain locations, like pumping water up and down hilly terrain (known as “pumped hydro”). But a group of English engineers have built an advanced heat pump and connected it to an energy storage system using two silos full of plain old gravel that they say is as cheap as pumped hydro, as location-agnostic as a battery — and is super efficient. The startup they founded two years ago called Isentropic, named after a reversible process in thermodynamics, is now looking for a Series B round of $5 million and will be showing off its technology at the Energy Storage Association conference." See full article.
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