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) 3rd song off of "Notes From The Underground's" "Another Way Out" was the official theme song for WWE's pay-per-view event Payback on June 16, 2013. The music video for "Dead Bite" was released on August 20, 2013. Much of the music on this album remains rooted in hip-hop. Notes from the Underground received generally positive reviews from music critics. Rick Florino of Artistdirect gave "Notes from the Underground" 5 out of 5 stars, noting that it is the best album of 2013 and best album Hollywood Undead has done to date, describing that the album "practically bubbles over with intoxicating,