Side-by-Side Analysis. All technologies, except for TPV and SPS, require about the same amounts of water. The range is 14-77 x 10$ m^/GW/yr (installed). Water use for SPS and TPV is negligible. Table 4.39 summarizes the side-by-side data. The entries are the volumes of water consumed; withdrawal requirements were not identified in the technology characterizations. Alternative Futures Analysis. Scenario data do not disaggregate coal use by technology. It is necessary to make an assumption about the ratio of deployment of conventional coal combustion to that of CG/CC. Assuming equal deployment, the average water consumption is about 45 x 10$ m^/GW/yr (installed) for coal technology. For non-solar technologies, the range of water consumption is then 32-45 x 10$ m^/GW/yr (installed). Since the real issue here is the impact solar technologies might have on water consumption, the precision gained by considering the individual technologies is of little value. Therefore, a mid-range value of 40 x 10$ m^/GW/yr (installed) is used to estimate these effects. Figure 4.42 illustrates these results. Table 4.39 Water Consumption Data for Energy Systems, 10$ m^/GW/yr (installed) Fig. 4.42 Alternative Futures Analysis of Annual Water Consumption for Baseload Electricity Generation
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