Sand is cheap, and stays stable up to 1200 C or so. For conversion back to work ...

		pfdietz on March 14, 2024 \| parent \| context \| favorite \| on: Giant 'sand battery' holds a week's heat for a who... Sand is cheap, and stays stable up to 1200 C or so. For conversion back to work the efficiency will be much higher than for lower temperature water.