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. CHAPTER III INITIAL DEVELOPMENT The powerplant under the initial stage of development would have an installed capacity of 30,000 kilowatts and a dependable output of about 27,000 kilowatts deliverable to load centers after allowances for a 10- percent transmission loss at peak generation, The average annual energy generation would be approximately 148,000,000 kilowatt-hours ~ith about 138,000,000 kilowatt-hours deliverable to load centers after transformation and transmission losses estimated at 7 percent of generation, The maximum and minimum static power heads for the powerplant would be 205 feet and 164 feet, respectively, with a weighted average operating head of about 193 feet for the 40-year study period. The powerplant would be rated at the minimum static head which is 80 percent of the maximum static head and the dependable generating capability of the plant would therefore be equal to its installed capacity as the reservoir would not be drawn down below the rated head. . The maximum water release through the powerplant for full plant capac- ity output would vary between about 2,200 second-feet at maximum head and 2,700 second-feet at minimum head, depending on the reservoir level, Under the reservoir operating criteria, the stream fishery portion of the avail. able water for power production would provide for 2,500 kilowatts of gener- ation at a 100-percent plant factor while the additional firm peaking power water releases would provide for about 27,500 kilowatts of peaking opera- tion at a monthly plant factor of approximately 38 percent. The minimum overall monthly and annual plant factors would be about 43 percent, while the plant factor would average about 56 percent for energy generation over the long-term period 1922 to 1961, inclusive, including energy production from advance water releases for power made in anticipation of reservoir spills in high runoff years. Economic and Financial Analyses Comparison of benefits and costs The economic justification of the initial development was measured by a comparison of benefits and costs, with both the benefits and costs computed as average annual equivalents over a 100-year period at 2 7/8 percent interest. Irrigation Benefits The estimate of project irrigation benefits for an irrigable area of 9,000 acres is summarized on the following page, This estimate is based on average annual equivalent per acre benefits for the 100-year period of project analysis, with adjustments made for the la-year project develop- ment period. . 68