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It is important to remember that these calculations assume that all electricity generated has the same value. Given this is typically not the case, then plants with higher storage levels are likely to provide more flexibility to capture the increased value of peak prices. This situation will evolve over time as thermal energy storage costs decline. Lower storage costs, particularly for solar tower projects, will result in a lower LCOE for plants with higher storage. The estimated LCOE of parabolic trough and linear Fresnel CSP systems without storage ranges from around USD 0.19 to USD 0.38/kWh, assuming capital costs of between USD 3 400 and USD 4 600/kW and capacity factors of between 20% and 27% (Figure 7.8). The lower end of this range represents very competitive projects in non‐OECD countries with high capacity factors. Adding six hours storage reduces the LCOE of the parabolic trough and linear Fresnel CSP systems to a range of between USD 0.17 to USD 0.37/kWh. Solar towers are a significantly less mature technology than parabolic trough systems, although they already have similar costs with an LCOE range of between USD 0.20 to USD 0.29/kWh when associated with six to seven and a half hours of storage. Increasing storage to between 12 and 15 hours of operation lowers the LCOE range to between USD 0.17 and USD 0.24/kWh. 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 No storage Parabolic trough/linear Fresnel 6 hours storage 6 to 7.5 hours storage Solar towers 12 to 15 hours storage FIGURE 7.8: THE LEVELISED COST OF ELECTRICITY OF CSP PLANTS IN 2011/2012 SOURCE: IRENA RENEWABLE COST DATABASE; FICHTNER, 2010; TURCHI, 2010A AND 2010B; AND HINKLEY, 2011. Renewable Power Generation Costs in 2012: An Overview 65 2011 USD/kWhPDF Image | International Renewable Energy Agency
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