Hot dry rock geothermal energy Hot dry rock geothermal energy Hot dry rock (HDR) is an abundant source of geothermal energy available for use. A vast store of thermal energy is contained within hot - but essentially dry - impervious crystalline basement rocks found almost everywhere deep beneath the earth’s surface. A concept for the extraction of useful amounts of geothermal energy from HDR originated at the Los Alamos National Laboratory in 1970, and Laboratory researchers were awarded a U.S. patent covering it. Although often confused with the relatively limited hydrothermal resource already commercialized to a large extent, HDR geothermal energy is very different. Whereas
This Is What You Came For among artists to 73). "This Is What You Came For" became Rihanna's 25th and Harris's fourth number one on the Hot Dance Club Songs Chart, where it became the first song since 2013's "Wake Me Up" to stay at number one for two weeks. As of October 2016, the single has sold 1.2 million copies in the United States. "This Is What You Came For" debuted at number one on the Scottish Singles Chart, and peaked at number one in Australia, Canada and Ireland. The song also reached the top 10 in Germany, Ireland, New Zealand, Switzerland, Belgium, Denmark, Finland,