Measured Heat Loss Tank Temperature deg C Predicted Heat Loss

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Date and Time

Figure 3. Cool down of hot storage tank at Solar Two.

It is important to note that at 10 MW, Solar Two is too small to be economically viable. Operation and maintenanc e (O&M) costs for a small solar only power tower are too high. This can be demonstrated by examing Table 3 (to be presented later). O&M costs become reasonable at 30 MW or greater system sizes. This has also been observed at the operating SEGS trough plants.

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