Hot dry rock geothermal energy as a separate state from that of the continuum of permeable rock—just as one would consider a completely closed faucet as distinct from one that is open to any degree, whether the flow be a trickle or a flood. In the same way, HDR technology should be regarded as totally distinct from EGS. A definitive book on HDR development, including a full account of the experiments at Fenton Hill, was published by Springer-Verlag in April 2012. Hot dry rock geothermal energy Hot dry rock (HDR) is an abundant source of geothermal energy available for use. A vast store of thermal
Hot Rocks 1964–1971 Hot Rocks 1964–1971 Hot Rocks 1964–1971 is a compilation album by the Rolling Stones released by London Records in December 1971. It became the Rolling Stones' best-selling release of their career and an enduring and popular retrospective. While the album carries most of the band's biggest hits during their first decade, it does drop a few of them to include standout album tracks such as "Play With Fire", "Under My Thumb" and "Gimme Shelter" giving listeners a more well-rounded impression of the Rolling Stones' music in this era. "Hot Rocks 1964–1971" peaked at No. 4 on the Billboard 200 album