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. . . POWER PRODUCTION AND MARKETING The average annual energy deliverable to load oenters, adjusted to account for time-value considerations in detennining the average equiv- alent energy over a 100-year period after eaoh plant is in full produc- tion,is 5,920,000,000 kilowatt-hours. This includes 5,558,000,000 kilowatt-hours for the units of the Colorado River Storage project and 362,000,000 kilowatt.-hours for the Central Utah project. The average annual equivalent capacity for a 100-year period when adjusted in tile same manner as the energy is 1,095,000 kilowatts, including 1,036,000 kilowatts for the storage project and 59,000 kilowatts for the Central Utah pl'Oject. During the filling period, firm energy for each year is considered to be all the energy that oan be utilized within the monthly load pattern to meet the annual load growth estimated for the power marl(et area by the Federal Power Commission. Beginning witll the post-filling operation of the reservoirs, annual !inn energy has been determined for each subsequent 10-year period to be the average annual generation for each period within the monthly load pattern estimated by the Federal Power Commiesion. Data from the study indioate that the installed capacity of l,22C,OOO kilowatts is reCJ.uired in the initial decades to market power and energy at the estimated load faotor for the market area of the study. When stream depletions inorease in later years, project power could be marketed at lO..or load factors than the area load factor. Marketing the power ini- tially at the load factor for the area and later at lower load :factors will result in utilizing the project plants most e:ffeot1vely to supply the reCJ.uirements of the area when operated in conjunction with other power systems. Preliminary data :from the power market survey indicate that project- produced power and energy can be readily absorbed in the market area as it becomes available from the project powerplants. The estimated require- ment by 1970 :for 3,659,000 kilowatts o:f new generating capacity and 14,]13,000,000 kilowatt-hours o:f generation can only be partially satis- fied by the 1,109,000 kilowatts of capacity and 6,850,000,000 kilowatt- hours of energy deliverable to load centers from the authorized units of the Colorado River Storage project and the Central Utah participating project. Power Rates As sho\/Il in the preliminary repayment study on page 48, an average rate of 6 mills per kilowatt-hour for firm energy and 2.5 mills per kilowatt-hour for nonfirm energy will provide sufficient revenues to repay all reimbursable power costs and additional revenues to assist in repayment of irrigation costs as required by the authorizing legislation. Definite rate schedulee :for :firm and nonfirm power and energy will be developed in accordance with Departmental policy and marketing criteria when costs are IIlOre firmly established and a need for such schedules eXiste. 24