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In an Active two-tank system, one tank holds hot HTF and another tank holds cold HTF. The hot HTF and cold HTF do not interact with each other. Major advantages of such systems are there will be no interaction between the fluids. Thus, heat loss is less and temperatures of the fluids in the tanks are almost uniform with time and position. However, two separate tanks of equal volumes are needed for such systems and tanks of the walls are subjected to daily cycles of molten salts. Thermal CSP plants with two-tank-based molten salt system are well documented by Kelly and Kearney (2004) and Herrmann et al. (2004). This concept can be used as direct or indirect storage systems.