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<br />" <br /> <br />., <br /> <br />. <br /> <br />PRELlMINAR. <br />SUBJECT TO REVT:jION <br /> <br />"::) <br />(..-) <br /> <br />the peakload months. The plant factor would be computed by measuring the area <br /> <br /> <br />under generation-duration curve and ratioing it to the total power generation <br /> <br /> <br />potential for the peakload months. <br /> <br />(0 <br />C':l <br />o <br /> <br />4. A power generation-duration curve is derived from a sequential <br /> <br /> <br />routing of daily inflows through the reservoir considering the operating rules <br /> <br /> <br />of the project. The product of the average daily release rate and the <br /> <br /> <br />associated average daily pool elevation determines the daily power generation <br /> <br /> <br />potential. For this reconnaissance level analysis. a sequential reservoir <br /> <br /> <br />routing was not performed. However. it was assumed that the product of the <br /> <br /> <br />average monthly release rate and the average monthly pool elevation would be <br /> <br /> <br />indicative of the power generation potential. <br /> <br />5. Dependable capacity is calculated with the following relationship. <br /> <br />HA HMA <br />Dependable Capacity = Installed Capacity * 100 * ~~ * (I+F) <br /> <br />where. <br /> <br />RA = Hydropower plant hydrologic availability (%) during <br />peakload period <br />HMA = Hydropower plant mechanical availability (%) <br />TMA = Thermal plant mechanical availability (%) <br />F -= Hydr~power plant flexibility factor <br /> <br />6. As stated above. the hydropower plant hydrologic availability (RA) <br /> <br /> <br />is equal to the plant factor during the peak load months of June. July and <br /> <br /> <br />August. The ratio of mechanical availability. HMA/TMA. is intended to reflect <br /> <br /> <br />the relative mechanical reliability of hydroelectric compared to thermal <br /> <br /> <br />generation. For this analysis. the hydropower plant mechanical availability <br /> <br />.. <br />waS assumed to be 98%. while the alternative coal-fired thermal plant <br /> <br /> <br />mechanical availability was assumed equal to 83%. Although the flexibility <br /> <br /> <br />'factor (F) is intended to reflect the operational advantages of using a hydro <br /> <br /> <br />plant compared to a thermal plant. the credit is not claimed in this analysis <br /> <br /> <br />because the operation of John Martin Dam does not allow for flexible power <br /> <br /> <br />operation. <br /> <br />15 <br />