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Publisher: Earthscan, UK Homepage: www.earthscan.co.uk/?tabid=101808 Energy and the New Reality, Volume 2: C-Free Energy Supply Chapter 5: Geothermal Energy L. D. Danny Harvey harvey@geog.utoronto.ca Publisher: Earthscan, UK Homepage: www.earthscan.co.uk/?tabid=101808 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Powerpoint format so as to allow customization for the individual needs of course instructors. Permission of the author and publisher is required for any other usage. Please see www.earthscan.co.uk for contact details.

The temperature increases with increasing depth in the Earth’s crust at a typical rate of 20 K/km

Types of geothermal resources: Hydrothermal – hot water or steam in confined aquifers, under pressure Geopressurized – hot, high-pressure brines (saline water) with dissolved methane Hot dry rock Magma

Figure 5.1 A hydrothermal geothermal resource Source: Barbier (2002, Renewable and Sustainable Energy Reviews 6, 63–65, http://www.sciencedirect.com/science/journal/13640321)

Geothermal energy can be used: Directly for heating To generate electricity

Figure 5.2 Agricultural uses of heat

Figure 5.3a US subsurface temperature at a depth of 6.5 km Source: MIT (2006, The Future of Geothermal Energy: Impact of Enhanced Geothermal systems (EGS) on the United States in the 21st Century)

Figure 5.3b Temperatures encountered as a depth of 5 km in Europe Source: GAC (2006, Trans-Mediterranean Interconnection for Concentrating Solar Power, Final Report, GAC)

Figure 5.4a Creil geothermal district heating (near Paris) Source: Brown (1996, Renewable Energy, Power for a Sustainable Future, Oxford University Press, Oxford)

Figure 5.4b Creil geothermal district heating Source: Brown (1996, Renewable Energy, Power for a Sustainable Future, Oxford University Press, Oxford)

Figure 5.5a Dry steam geothermal power Source: Brown (1996, Renewable Energy, Power for a Sustainable Future, Oxford University Press, Oxford)

Figure 5.5b Single-flash geothermal power Source: Brown (1996, Renewable Energy, Power for a Sustainable Future, Oxford University Press, Oxford)

Figure 5.5c Binary-cycle geothermal power Source: Brown (1996, Renewable Energy, Power for a Sustainable Future, Oxford University Press, Oxford)

Figure 5.5d Double-flash geothermal power Source: Brown (1996, Renewable Energy, Power for a Sustainable Future, Oxford University Press, Oxford)

Figure 5.6 Enhanced geothermal system (EGS) Source: Mock et al (1997, Annual Review of Energy and Environment 22, 305–356)

Figure 5.7a CO2 emissions Source: Barbier (2002, Renewable and Sustainable Energy Reviews 6, 63–65, http://www.sciencedirect.com/science/journal/13640321)

Figure 5.7b S emissions Source: Barbier (2002, Renewable and Sustainable Energy Reviews 6, 63–65, http://www.sciencedirect.com/science/journal/13640321)

Figure 5.8 Worldwide direct use of geothermal heat and generation of electricity from geothermal energy

Figure 5.9 Geothermal share of national electricity production

Figure 5.10 Amount of heat available at different temperatures and at different depths below the US land surface Source: MIT (2006, The Future of Geothermal Energy: Impact of Enhanced Geothermal systems (EGS) on the United States in the 21st Century)

Figure 5.11 Cost of geothermal electric powerplants Source: IEA (2006c) , Renewable Energy: RD&D Priorities, Insights from IEA Technology Programmes, International Energy Agency, Paris)

Figure 5.14 Cost of oil, gas and hot dry rock geothermal wells Source: MIT (2006, The Future of Geothermal Energy: Impact of Enhanced Geothermal systems (EGS) on the United States in the 21st Century)

Figure 5.13 Scenario for the variation in the cost of electricity from EGS as the EGS power capacity in the US increases to 100 GW by 2050 Source: MIT (2006, The Future of Geothermal Energy: Impact of Enhanced Geothermal systems (EGS) on the United States in the 21st Century)