From the article: "When this sand is heated up, using a simple heat ex-changer buried in the middle of it, this device is capable of storing an impressive 8 megawatt-hours of energy, at a nominal power rating of 100 kW, with the sand heated to somewhere around 500-600 degrees Celsius (932-1112 °F).
I want one in my driveway.
You’ll never have to shovel snow from that driveway again.
Ok, dry steam much more useful. Can be used many ways, including to turn a turbine.