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Task 3 Multiple Plants at a Common Site The indirect costs for the second, third, and fourth plants were estimated to be 8 percent less than of the costs for the first, based on the following: • Much of the engineering and procurement documentation from the first plant could be used on the subsequent projects, reducing the costs by 25 percent. • The remaining indirect costs for construction management, field procurement, startup, checkout, and contractor fee involved primarily field labor, with a minimum of documentation. As such, discounts on the second and subsequent plants were believed to be, at most, minor. The anticipated progression in the overall plant expenditure is shown in Table 5. As with the direct and the indirect costs, some of the project related expenses were also expected to decrease for the second, third, and fourth plants. For example, the project development costs could decrease by as much as 75 percent if the land, the power purchase agreement, and the land use permits for the first plant were applicable to the subsequent plants. Similarly, mobilization costs could decline by 50 percent if the same constructor was used for all of the projects. However, discounts on the lenders fees were not anticipated for the subsequent projects, as discussed below in Section 6. For the single 250 MWe plant, the project related expenses added approximately 24 percent to the overnight construction costs. For the four 250 MWe plants, the average of the related expenses decreased to 20 percent of the overnight costs. 4.4 Four 250 MWe Plants with Adjacent Power Blocks With adjacent power blocks, the additional collector field piping listed in Table 2 was required. Based on the unit costs in the piping optimization model, the total field cost for the incremental piping was estimated to be $75 million. To this was added an incremental cost of $7 million for the additional heat transport fluid pump capacity of 10,600 kWe. The economic effect of the additional piping and the heat transport pump capacity was fairly significant, representing an increase in the collector field piping cost of about 35 percent, and an increase in the unit plant cost of $88/kWe. As shown in Figure 3, the incremental field piping was sufficiently segregated that only those headers associated with each 250 MWe collector field needed to be installed with each collector field. Thus, the incremental costs were distributed over the four plants. The anticipated progression in the overall plant expenditure is shown in Table 6. As with the four plant option above, the average of the related expenses decreased to 20 percent of the overnight costs. - 17 -PDF Image | Nexant Parabolic Trough Solar Power Plant Systems Analysis 2005
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