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Statement of Problem. The temporal nonuniform production of electrical energy of hydroelectric stations in power interties is supplemented by the production of thermal power stations.If the inflow of water to hydrostations during the entire planned period were known before its start, then the volume of required fuel would be determined uniquely. Under conditions of an unknown inflow a certain standard value, presently the normal annual value of the production of energy with consideration of withdrawals and regimes of water use, is taken for planning fuel supplies [i]. In this case a shortage of fuel occurs during the lowwater period in the power system and a surplus of fuel in the high-water period (Fig. i).According to the existing standards, the production of hydrostations is assigned close to the normal annual even when with respect to the state of reservoirs it should not exceed the firm production. Reservoirs of hydrostations become an energy reserve, due to which the differemce between the firm and normal annual production of hydrostations is compensated for a certain time. In the low-water period the useful storage of a reservoir is consumed before its end, and the hydrostations begin to operate with a production considerably less than the design firm production, ie., with unregulated interruptions. Furthermore, when the reservoir is drawn down the hydrostations operate at low heads, which leads to loss of possible production. Under these conditions the requirements of nonpower consumers, for example, water transport are not met.Drawdown of reservoirs is more intense than specified by the control regulations and is especi~!ly dangerous in the case of carryover storage, since the normal operation of the hydrostat$ons can be restored only after many years.I~ any balanced and especially deficit power system any additional drawdown of the reservoir to that specified by the design leads to a decrease in the probability of using the installed capacity of hydrostations with respect to water and head, to an increase in the deficit of production, and ultimately to an increase of the required capacity and energy re-1,18,

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