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In Citarum River, West Java, Indonesia, there are three serial reservoirs successively spreading out from upstream to downstream, namely Saguling Reservoir with the volume of 875 million m3and electrical energy production of 700 MW, Cirata Reservoir with the volume of 2,156 million m3 and electrical energy production of 500 MW, and Jatiluhur Reservoir, the most downstream, with the volume of 2,451 million m3 and electrical energy production of 150 MW. Jatiluhur Reservoir also provides supply for irrigation of 260,000 ha areas and drinking water industry with average inflow of 100m3/s. Those reservoirs have highly fluctuated with maximum water level 5 m per month. This condition occurs as sharing-non-sharing system is applied. Although this fluctuation is still in a normal condition, it affects the stability of reservoir slope. This study discusses about the validation of linear method to reach an optimal value of reservoir production in terms of electrical energy. The primary reservoir inflow data used was from 1988-2000, while the demand data was taken from 1992-2000, Cascade reservoir technique data was based on the existing data in 2000, Stochastic analysis was used to determine the inflow of 2000-2005 generation, while demand analysis was carried out using regression analysis. Multi-reservoir optimization analysis is carried out with linear simulation programs to obtain energy or fulfillment of demand every month, while demand for irrigation in the Jatiluhur reservoir is needed as a top priority supported by Saguling, Cirata and Jatiluhur reservoirs as the next priority. The result of optimizing cascade reservoir from 2001-2005, with initial period of operation on April obtained an average electrical production of 4,996.5 GWh, shows that the realization of average electrical production is 4,141.96 GWh. Besides, the average of demand is 4,996.8 MCm while the average supply is 5,806.2 MCm.