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Historically, power revenues have provided 96.7 percent of the total revenue, and the remaining 3.3 percent was provided by other revenues which consist of property rental and other miscellaneous revenue. Revenues to meet the average annual increases in costs are almost entirely reliant on increases in RGP power rates. By the year 2000, 98,8 percent of the total revenues are expected to come from power revenues and 1.2 percent from other revenues. The FY 1985 Final Revised PRS indicates that a composite power rate of 37.32 mi lls per kWh at 58.2 percent load factor, with components of $7.931 per kW-month and 18.66 mills per kWh, would pay the annual operating expenses and accompliSh timely repayment of all costs assigned to the power function. It is proposed that these rates be adopted as the new RGP power rates effective with the April 1987 bi 11ing period. VI. POWER REPAYMENT STUDIES A. Repayment Criteria. Power repayment studies are used to determine if power revenues are sufficient to pay, within the prescribed time periods, all costs assigned to the power function. Repayment criteria are based on law and on policies established in ODE Order No. RA-6120.2. According to DOE Order No. RA-6120.2, power revenues are required to (1) repay power investment costs including interest within 50 years, (2) repay power replacement costs including interest within the service lives of the equipment not to exceed 50 years, and (3) repay irrigation investment costs allocated to power within 60 years (the time allowed for repayment by irrigation water users) . In the historical years FY 1941 through FY 1950, power revenues were sufficient to pay the annual operating expenses and interest costs and to repay some of the power investment costs. In most of the remaining historical years, FY 1951 through FY 1980. power revenues were not sufficient to pay part of the annual operating expenses and interest costs. For the FY 1951 through FY 1970 period, the rleficits were capitalized and added to the investment costs to be repaid at 3 percent interest. Following issuance of Department of the Interior Secretarial Order No. 2929, current interest rates were applied to debts incurred after FY 1970. These debts were classified in two categories, "annual expenses" and "deferred interest". In FY 1971 and FY 1972, debts of the annual expense and deferred interest types were incurred. In the years FY 1973 through FY 1979, power revenues were sufficient to pay annual operating expenses, but not part of the interest; and the debts fell into the deferred interest category. In FY 1980, power revenues were sufficient,to pay annual operating expenses and interest costs, to repay the debts incurred in FY 1971 and FY 1972 for annual expenses, and to repay part of the deferred interest debts. Since FY 1980, power revenues have been sufficient to pay annual operating expenses and interest costs, and to repay most of the deferred interest debts. 9