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Table 1.3 Levelized energy cost (LEC) for six selected EGS sites for development. Site Average Depth Well Base Case Base Case Name gradient to Depth Initial Values Mature Technology ∂T/∂z Granite (km) 20 kg/s 80 kg/s (°C/km) (km) production rate production rate to well LEC (¢/kWh) LEC (¢/kWh) depth E. 40 5 5 29.5 21.7 6.2 5.8 7.1 Texas Basin, TX Nampa, 43 4.5 5 24.5 19.5 5.9 5.5 6.6 ID Chapter 1 Synopsis and Executive Summary 129 MIT GETEM MIT GETEM Depth EGS EGS (km) We assumed a sixyear nominal lifetime period for each stimulated reservoir, which led to a complete redrilling and restimulation of the system in sixyear intervals for the lifetime of the surface plant facilities, typically 20 to 30 years. Other important factors affecting the levelized energy cost (LEC) include equity and debt interest rates for invested capital, welldrilling costs, surface plant costs, and reservoir flow rate per production well. Table 1.3 gives estimated values for six representative EGS sites for the United States, showing the dramatic effect that reservoir fluid flow rate has on LEC, going from an initial value of 20 kg/s per well to 80 kg/s per well for the two base cases shown. Sisters 50 3.5 5 17.5 15.7 5.2 4.9 5.1 Area, OR Poplar 55 4 2.2 74.7 104.9 5.9 4.1 4.0 Dome a, MT Poplar 37 4 6.5 26.9 22.3 5.9 4.1 4.0 Dome b, MT Clear 76 3 5 10.3 12.7 3.6 4.1 5.1 Lake, CA Conway 24 0 7 68.0 34.0 9.2 8.3 10‡ Granite, NH ‡10 km limit put on drilling depth – MIT EGS LEC reaches 7.3¢/kWh at 12.7 km and 350°C geofluid temperature.PDF Image | Synopsis and Executive Summary
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