Note: Intro -- Preface -- Contents -- 1 Thermal Structure of the Earth -- 1.1 Renewable Energies, Global Aspects -- 1.2 Internal Structure of the Earth -- 1.3 Energy Budget of the Planet -- 1.4 Heat Transport and Thermal Parameters -- 1.5 Brief Outline of Methods for Measuring Thermal Parameters -- 1.6 Measuring Subsurface Temperatures -- References -- 2 History of Geothermal Energy Use -- 2.1 Early Utilization of Geothermal Energy -- 2.2 History of Utilization of Geothermal Energy in the Last 150 Years -- References -- 3 Geothermal Energy Resources -- 3.1 Energy -- 3.2 Significance of "Renewable" Energy -- 3.3 Status of Geothermal Energy Utilization -- 3.4 Geothermal Energy Sources -- References -- 4 Uses of Geothermal Energy -- 4.1 Near Surface Geothermal Systems -- 4.2 Deep Geothermal Systems -- 4.3 Efficiency of Geothermal Systems -- 4.4 Major Geothermal Fields, High-Enthalpy Fields -- 4.5 Outlook and Challenges -- References -- 5 Potential and Perspectives of Geothermal Energy Utilization -- References -- 6 Geothermal Probes -- 6.1 Planning Principles -- 6.2 Construction of Ground Source Heat Exchangers -- 6.3 Dimensioning and Design of Geothermal Probes -- 6.3.1 Heat Pumps -- 6.3.2 Thermal Parameters and Computer Programs for the Design of Ground Source Heat Pump Systems -- 6.4 Drilling Methods for Borehole Heat Exchangers -- 6.4.1 Rotary Drilling -- 6.4.2 Down-The-Hole Hammer Method -- 6.4.3 Concluding Remarks, Technical Drilling Risks -- 6.5 Backfill and Grouting of Geothermal Probes -- 6.6 Construction of Deep Geothermal Probes -- 6.7 Operating Geothermal Probes: Potential Risks, Malfunctions and Damages -- 6.8 Special Systems and Further Developments -- 6.8.1 Geothermal Probe Fields -- 6.8.2 Cooling with Geothermal Probes -- 6.8.3 Combined Solar Thermal - Geothermal Systems -- 6.8.4 Geothermal Probe: Performance and Quality Control. , 6.8.5 Thermosyphon, Heat Pipe: Geothermal Probes Operating with Phase Changes -- References -- 7 Geothermal Well Systems -- 7.1 Building Geothermal Well Systems -- 7.2 Chemical Aspects of Two-Well Systems -- 7.3 Thermal Range of Influence, Numerical Models -- References -- 8 Hydrothermal Systems, Geothermal Doublets -- 8.1 Exploration of the Geologic and Tectonic Structure of the Underground -- 8.2 Thermal and Hydraulic Properties of the Target Aquifer -- 8.3 Hydraulic and Thermal Range of Hydrothermal Doublets, Numerical Models -- 8.4 Hydrochemistry of Hot Waters from Great Depth -- 8.5 Reservoir-Improving Measures, Efficiency-Boosting Measures, Stimulation -- 8.6 Productivity Risk, Exploration Risk, Economic Efficiency -- 8.7 Some Site Examples of Hydrothermal Systems -- 8.8 Project Planning of Hydrothermal Power Systems -- 8.9 Aquifer Thermal Energy Storage (ATES) -- References -- 9 Enhanced-Geothermal-Systems (EGS), Hot-Dry-Rock Systems (HDR), Deep-Heat-Mining (DHM) -- 9.1 Techniques, Procedures, Strategies, Aims -- 9.2 Historical Development of the Hydraulic Fracturing Technology, Early HDR Sites -- 9.3 Stimulation Procedures -- 9.4 Experience and Coping with Seismicity -- 9.5 Recommendations, Notes -- References -- 10 Geothermal Systems in High-Enthalpy Regions -- 10.1 Geological Features of High-Enthalpy Regions -- 10.2 Development, Installation and Initial Commissioning of Power Plants -- 10.3 Main Types of Power Plants in High-Enthalpy Fields -- 10.3.1 Dry Steam Power Plant -- 10.3.2 Flash Steam Power Plants -- 10.4 Evolving Deficiencies, Potential Countermeasures -- 10.5 Use of Fluids from Reservoirs at Supercritical Conditions -- References -- 11 Environmental Issues Related to Deep Geothermal Systems -- 11.1 Seismicity Related to EGS projects -- 11.1.1 Induced Earthquakes -- 11.1.2 Quantifying Seismic Events -- 11.1.3 The Basel Incident. , 11.1.4 The St. Gallen Incident (E Switzerland) -- 11.1.5 Observed Seismicity at Other EGS Projects -- 11.1.6 Conclusions and Recommendations Regarding Seismicity Control in Hydrothermal and Petrothermal (EGS) Projects -- 11.2 Interaction Between Geothermal System Operation and the Underground -- 11.3 Environmental Issues Related to Surface Installations and Operation -- References -- 12 Drilling Techniques for Deep Wellbores -- References -- 13 Geophysical Methods, Exploration and Analysis -- 13.1 Geophysical Pre-drilling Exploration, Seismic Investigations -- 13.2 Geophysical Well Logging and Data Interpretation -- References -- 14 Testing the Hydraulic Properties of the Drilled Formations -- 14.1 Principles of Hydraulic Well Testing -- 14.2 Types of Tests, Planning and Implementation, Evaluation Procedures -- 14.3 Tracer Experiments -- 14.4 Temperature Evaluation Methods -- References -- 15 The Chemical Composition of Deep Geothermal Waters and Its Consequences for Planning and Operating a Geothermal Power Plant -- 15.1 Sampling and Laboratory Analyses -- 15.2 Chemical Parameters Characterizing Deep Fluids -- 15.3 Graphical Representation of Deep Fluid Composition -- 15.4 Estimating Reservoir Temperature from the Composition of Deep Fluids -- 15.4.1 The Quartz Thermometer -- 15.4.2 The K-Na Exchange Thermometer -- 15.4.3 The Mg-K Thermometer -- 15.4.4 Other Cation Thermometers -- 15.4.5 The Ternary Giggenbach Diagram -- 15.4.6 Multiple Equilibria Models for Equilibrium Temperature -- 15.5 Origin of Fluids -- 15.6 Saturation States, Saturation Index -- 15.7 Mineral Scales and Materials Corrosion -- References.