A startup from Finland called Polar Night Energy has developed an energy storage system based on sand. The idea is to store excess energy generated from clean electricity sources such as Wind, Solar, etc., to be reused days or even months later.
If it works, it will help solve the primary pain point of intermittent clean energy sources by making their final energy output more predictable and, therefore, more reliable.
But how does it work, and why sand? Polar Night Energy’s solution is straightforward and elegant. They use clean electricity to heat a large mass of sand well insulated from the outside. It could be in a silo or even buried underground.
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