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 Underground serfs, Russia was still very much a post-medieval, traditional peasant society. However, when "Notes From Underground" was written, there was an intellectual ferment on discussions regarding religious philosophy and various 'enlightened' utopian ideas. Dostoevsky, however, along with his notable contemporary, Soren Kierkegaard, rejected such ideas for proto-existentialist themes. Most importantly, the legacy that the work leaves is a challenge to and a method of understanding the larger implications of a utopian society. Utopianism largely pertains to a society's collective dream, but what troubles the Underground Man is this very idea of collectivism. The point the Underground Man makes is that