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OOLORADO RIVER S'l'ORAGE PROJEO'l' 31 The use of the 83.percent efficiency factor would help prevent this type of payment. The 83.percent efficiency factor is selected be. cause that is the efficiency used in the computations to determine the amount of Hoover firm energy as defined in the "General Regula. tions for Generation' and Sale of Power in Accordance With the Boulder Oanyon projbct Adjustment Act." . The way is left o'pen for the Secretary to determine how the allowance would be accomplished. For example, the Secretary might decide, if it can be worked out, to make a monetary payment therefor. If the increment.al cost, which is to say the fuel replacement cost of generating substitute .energy, is less than the selling rate for power from the upper basin projMt, then the upper basin project is better off financially to compensate monetarily than it would be to compensate with kilowatt-hours. On the other hand, it might be simpler and better to compensate witb kilowatt-hours. This could be accomplished through the interconnection of the two power systems. It may even be possible that the Hoover power allottees would be willing to have a system of debits an:d credits on energy. In other words, in those years in which there is a deficiency, the power allot tees might be willing to have that lleficiency replaced in a subsequent year. Par- . ticularly to be noted is the fact that Glen Oanyon Reservoir will be available to store water through two flood seasons prior to the avail- ability of the generators at Glen Oanyon. If any deficiency is created during this period, it can be compensated only by dollars or by debits and credits, unless some other source of energy is available to the United States. Final decisions on (,he means of making the allowanee is not possible at this time and will need to be based upon negotiations and on results of studies now underway in regard to possible eleetrical intertie. In the event of an allowance for computed deficieney, the Hoover power eon tractors will eontinue to pay under the Hoover Dam power contracts in the same manner as if the amount of energy involved in the deficieney had be'en generated at Hoover. Paragraph 6 is simply a tie between the general prineiples and the operating eriteria. Paragraph 7 sets forth the method whereby minimum power head (elevation 3,490) would be gained in Glen Oanyon. The prollosal here is to aequire this storage at the earliest praetieable time. How- ever, Lake Mead would not be drawn below the rated head of the Hoover powerplant while acquiring this storage in ;Glen Oanyon. This is a significant ppint. If the rnted head is maintained at Hoover, then only the energy generation at Hoover is affected and not the design eapacity. . Paragra.ph 8 sets forth the prineiple that the powerplants will be coordinated and integrated and states the general method whereby this will be aceomplished. At this time it is not entirely elear whether the eoordination and integration need be electrieal in addition . to hydrologic. Decisions on possible eleetrieal intertie will need to be made later, following additional study. Only very general plans can be set forth in advanee. To obtain the greatest practieal amount of power and energy,.the plants will have to be operated on an annual basis as conditions QCcur, and there must be therefore freedom to operate without being tied to a specific plan. The proposal for eoordinated and in~egrated operation is deliberately tied to the