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8. Levelized Energy Costs Levelized energy costs were calculated to determine the economic benefits to multiples plants at a common site. The calculations were based on the following: • For a Barstow location, the 4 x 250 MWe plant with the separated power blocks had a net annual electric energy production of 2,963,900 MWhe. The plant arrangement with adjacent power blocks incurred a penalty of about 15 percent in the annual energy required for the heat transport fluid pumps, which increased the overall parasitic energy demand by 4 percent. However, the improvements in the plant availability and the winter thermal-to-electric conversion efficiencies resulted in net energy production increase of about 4.5 percent, to a new value of 3,098,500 MWhe. • From the Excelergy analyses in Task 1, a nominal fixed charge rate of 10.25 percent was calculated, based the default financial parameters, and on an optimum debt fraction and equity fraction of 0.60 and 0.40, respectively. • For the purposes of Task 3, levelized energy costs were calculated based on the following simplified approach: Levelized energy cost, $/kWhe = (Fixed charge rate)(Capital cost) + (Operation and maintenance cost) Annual energy production, kWhe The results of the calculations are presented in Table 8. Table 8 Levelized Energy Costs Task 3 Multiple Plants at a Common Site Equivalent annual capital cost, $1,000 Annual operation and maintenance cost, $1,000 Annual energy production, MWhe Levelized energy cost, $/kWhe Savings due to multiple plants, percent 1 x 250 MWe 111,496 11,780 740,980 0.166 Base 4 x 250 MWe plant Separated power blocks 404,333 38,300 2,963,920 0.149 -10.2% 4 x 250 MWe plant Adjacent power blocks 413,900 35,950 3,098,532 0.145 -12.7% Replicating the 250 MWe plant, and keeping the power block at the center of each respective collector field, yielded a nominal 10 percent reduction in the levelized energy cost. Locating the power blocks at a common location offered an additional 2.5 percent reduction in the energy cost. - 25 -PDF Image | Nexant Parabolic Trough Solar Power Plant Systems Analysis 2005
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