by https://polarnightenergy.fi/technology
“Our novel solution enables the up-scaling of solar or wind energy to up to 100% of your heating and electricity demand. The core of our solution is our patented high-temperature large scale heat storage.
We Use Really, Really Hot Sand as The Storage Medium
We convert electricity to heat, and store it for later use. We use sand as the storage medium, which leads to safe operation and a natural balance in the storage cycle. Additionally, sand is a cheap and abundant material, which can be heated up to 1000 °C and even higher.”
https://www.thesciverse.com/2022/07/worlds-first-large-scale-sand-battery.html
First sand battery goes online in Finland.
