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
Echoes from the Underground dedicated to troops overseas, but as the song developed, he shifted it to more personal themes, and instead wrote "A Song for Someone" for the troops overseas instead. All songs written by Matt Scannell, except where noted. Echoes from the Underground Echoes from the Underground is the sixth studio album from the band Vertical Horizon, released on October 8, 2013. "Broken Over You" was released as the lead single. Rush drummer Neil Peart played the drums on two songs on the album, including "Instamatic". After the band's 2009 album, "Burning the Days", band co-founder Keith Kane left the band shortly