UTILPLAN is an operational planning program for utility systems. For a multiperiod operation with piecewise constant varying demands for utilities, the optimal choice of units for each period is determined. The model is formulated as a mixed-integer linear program (MILP) according to Ramaswamy R. Iyer and Ignacio E. Grossmann (1996) . The objective function accounts for both the operation costs for each period and changeover costs for startup/shutdown of units between periods of operation.
This interface is written in language C and runs on Windows 98 or Windows-NT. The way this interface works is through different menus; it is flexible and easy to use. Given the data of the problem, UTILPLAN creates a new GAMS file containing the model equations and optimizes the problem.

UTILPLAN has been developed by Gabriela Garcia-Ayala under the supervision of Ignacio Grossmann .

References for UTILPLAN:

Ramaswamy R. Iyer and I. E. Grossmann, Optimal Mutliperiod Operational Planning for utility systems, Computers chem. Engng Vol.21, No. 8, pp787-800, 1997.

Garcia-Ayala, Gabriela, Guidelines for UTILPLAN Interface, Carnegie Mellon University, Engineering Design Research Center, Pittsburgh, PA 2000.