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 (creative writing paper) Notes from the Underground (creative writing paper) Notes from the Underground is a creative writing free newspaper. Its first issue was distributed on the London Underground and in shops and libraries throughout London on 17 December 2007. It aims to function as a quality alternative free newspaper to those on the tube. It was inspired by the success of thelondonpaper but aims to be an entertaining and accessible platform for up-and-coming writers and illustrators. Most of the stories are by new writers, though several more famous authors have written new stories for the paper. These include "The Dreams of Bethany