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Synopsis and Executive Summary

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Synopsis and Executive Summary ( synopsis-and-executive-summary )

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16 14 12 10 United States EGS Resource 14 x 10 EJ Total US Energy Consumption in 2005 = 100 EJ Stored Thermal Energy in Finally, the recoverable heat in kJ or kW­s in a given 1 km slice per unit of surface area was then determined from the total energy in place at that depth, i.e., the resource­base amount (results are shown in Figure 1.7). A final limiting factor was introduced to account for the fact that only a portion of the land area in the United States is accessible for EGS development. Areas within national parks and monuments, wilderness areas, etc., would be off­limits to EGS, as well as some locations near and within large urban areas or utility and transportation corridors. 8 6 4 2 5.6 x 106 EJ Place 2.8 x 10 EJ 2% Conservative 20% Midrange 40% Upper Limit (3 to 10 km) 5 2.8 x 10 EJ 6 In addition to estimating the recoverable fraction of energy that can be extracted from the total EGS resource, it is important to also estimate the amount of surface­land area and subsurface rock volume required for an EGS plant. For scaling purposes, we have based an analysis of above­ground requirements on those needed for existing hydrothermal systems (see Chapters 7 and 8), while below­ ground requirements were based on the amount of rock volume needed to sustain plant operations for a 20­year period. These are tabulated for a range of plant sizes on a per MW basis for the surface 18 Figure 1.7 Estimated total geothermal resource base and recoverable resource given in EJ or 10 Joules. Estimated Recoverable EGS Resource Resource Base Note: Other energy equivalent units can be obtained using conversion factors given in Appendix A. Table 1.2 Estimated land area and subsurface reservoir volumes needed for EGS development. Note: Above 100 MW , reservoir size scaling should be linear. Plant size in MW Surface area for power plant Subsurface reservoir and auxiliaries in km volume in km plant and auxiliaries, and for the subsurface reservoir in Table 1.2. 2516 1.5 50 1.4 2.7 75e1.8 3.9 100 e 2.1 2 5.0 3 Chapter 1 Synopsis and Executive Summary 1­17 e Thermal Energy (106 EJ) 1. Assuming 10% heat to electric­power efficiency, typical of binary plants. 2. Introduces a factor of 4 to surface area and volumes to deal with redrilling of reservoir at 5­year intervals over a 20­year projected lifetime.

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