Energy in South Australia and trap in the deeper heat. Due to the low permeability of granite, the hot rocks must undergo hydraulic fracturing and be stimulated to allow a flow of water through the system to produce energy. This heat is slowly conducted to shallower rocks near the surface. Petratherm propose developing the geothermal energy in the more permeable sedimentary rocks that overlay the hot granite, a process called Heat Exchange Within Insulator (HEWI). While somewhat cooler, in many cases they do not require hydraulic fracturing. It is estimated that one percent of geothermal energy shallower than five kilometres below the earth's surface
Notes from the Underground (Hollywood Undead album) much fun they had doing without the label telling them what to do, he explained this record will be more like "Swan Songs" than "American Tragedy". He also revealed the album will be released on January 8, 2013. On December 11, the band announced that they will embark on a headlining tour titled "The Underground Tour", to promote "Notes from the Underground". Tour dates range from January 8, 2013, to January 23, starting in Hollywood, California. A video was released in promotion of the upcoming tour. On October 29, 2012, the first official single from "Notes from the Underground", titled