[0] is a BBC article on the same topic. A large mass of sand which can store energy as heat for months at a time. Is calling it a battery really, accurate? To g

[0] is a BBC article on the same topic. A large mass of sand which can store energy as heat for months at a time. Is calling it a battery really, accurate? To get the energy back from the sand, you would have to reconvert heat to electricity, which is quite lossy. [0] https://www.bbc.com/news/science-environment-61996520 https://www.bbc.com/news/science-environment-61996520