A three-dimensional numerical model was developed to forecast the behavior of the Mt. Apo Geothermal Reservoir supplying steam to two plants with a total installed capacity of 102 MWe. The numerical model currently running in TETRAD consists of 1122 blocks. The model was calibrated initially by matching the pre-exploitation state of the reservoir, followed by matching the production histories of nine wells supplying steam to the first 52 MWe plant. The obtained natural state gave good matches to the measured temperatures and pressure and represented the major features of the field. History matching runs closely match the discharge history of the field. Forecasting runs were made under the present development strategy of the field. Forecasting results indicated that the current available production wells are capable of providing steam for the two plants for at least five years.

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