Renewables, back to the stone age: the energy stored in basalt stones

Energy returns to the stone age. Small basalt stones, no bigger than a pea or a hailstone, could represent the solution to one of the great problems of the energy transition: how to store the energy produced by wind and photovoltaic renewables when there is little demand for electricity. to then reuse it at night or when the sun goes down? And above all, how to “store” it in the most efficient and economical world?

In Denmark they have seen fit to use a technology already known and well tested – heat pumps – using basalt, rock of volcanic origin as a raw material to store excess energy and as such very resistant to high temperatures.