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7. Operation and Maintenance Costs Operation and maintenance cost estimates were developed using a spreadsheet model prepared by NREL, with minor modification developed by Nexant for the larger plant sizes in Task 3. The NREL model was based on detailed assessments of the operating expenses at the SEGS III through VII plants at Kramer Junction. The NREL costs were extrapolated to the larger plant sizes based on the following approach: • Administration costs were largely independent of the capacity of the plant, and were weakly dependent on the number of plants at a site. • Solar field operating and maintenance costs were essentially proportional to the size of the collector field. • Rankine cycle operating costs were essentially proportional to the number of the number of cycles, and varied with the power rating based on exponents ranging from 0.5 to 0.7. For the study, operation and maintenance estimates were developed for 4 cases, as follows: 1) SEGS III through VII, as a point of reference 2) The baseline 250 MWe plant 3) A 940 MWe (net) plant, with four separated 250 MWe power blocks 4) A 940 MWe (net) plant, with four adjacent 250 MWe power blocks. The results are summarized in Table 7. As might be expected, Case 1 had the highest unit costs, in both $/kWe-year and $/m2-year. The results can be traced to the operating complexities associated with 5 Rankine cycles, and the corresponding high staffing requirement of 0.78 personnel per MWe. The operating costs for Case 2 were about one-third lower than Case 1. Most of the benefit was derived from the smaller staff needed to operate and maintain one, as opposed to five, Rankine cycles. A review of the remaining data showed most of the balance in the operating costs were essentially proportional to the collector field area. The unit operating costs for Case 3 were about 20 percent lower than for Case 2. Although Case 3 had four Rankine cycles, as opposed to one for Case 2, the ability to distribute the Administration and the Power Plant Maintenance costs over 940 MWe, rather than 235 MWe, was the principal source of the savings. - 22 - Task 3 Multiple Plants at a Common SitePDF Image | Nexant Parabolic Trough Solar Power Plant Systems Analysis 2005
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