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Figure 7.5 shows the relationship between capacity factor and thermal energy storage in hours (h) for different solar multiples in regions with a good solar resource. The trade‐off between the incremental costs of the increased solar field and the storage system must be balanced against the anticipated increase in revenue that will accrue from higher production and the ability to dispatch power generation at times when the sun is not shining. 70% 60% 50% 40% 30% 20% 10% 0% 0 3 6 9 12 15 18 Thermal energy storage (hours) Solar multiple 1.0 1.2 1.5 1.8 2.1 2.5 3.0 3.5 FIGURE 7.5: ANNUAL CAPACITY FACTOR FOR A 100 MW PARABOLIC TROUGH PLANT AS A FUNCTION OF SOLAR FIELD SIZE AND SIZE OF THERMAL ENERGY STORAGE SOURCE: TURCHI, 2010A. 7.4 THE LEVELISED COST OF CSP The LCOE of CSP plants is strongly correlated with the DNI. Assuming a base of 2 100 kWh/m2/year (a typical value for Spain), the estimated LCOE of a CSP plant is expected to decline by 4.5% for every 100 kWh/m2/year that the DNI exceeds 2 100 (Figure 7.6). 110 105 100 95 90 85 80 75 70 65 60 2000 Italy Greece Southern Turkey -4.5% per 100 kWh/m2/year 2100 2200 Spain Portugal UAE 2300 2400 Tunisia -18-19% 2500 2600 -24-25% 2700 2800 California (U.S.) Algeria South Africa -33-35% 2900 3000 DNI in kWh/m2/year Morocco Saudi Arabia Nevada (U.S.) Australia Chile Arizona (U.S.) FIGURE 7.6: THE LEVELISED COST OF ELECTRICITY OF CSP PLANTS AS A FUNCTION OF DIRECT NORMAL IRRADIANCE SOURCE: A.T. KEARNEY AND ESTELA, 2010. Renewable Power Generation Costs in 2012: An Overview 63 % compared to reference plant in Spain Annual capacity factorPDF Image | International Renewable Energy Agency
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