Interestingly, next generation solar thermal storage might be sand-like as well: https://www.azocleantech.com/article.aspx?ArticleID=1057 https://www.azocleante

Interestingly, next generation solar thermal storage might be sand-like as well: https://www.azocleantech.com/article.aspx?ArticleID=1057 https://www.azocleantech.com/article.aspx?ArticleID=1057