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Ahstrad -The operating flexibility of certain types of generating units can be exploited to reduce the production cost of their system. These units have different operating modes where the operating parameters can differ greatly depending which mode is operating at the time. Examples of such units are: combined cycle, fuel switchinglblending, constaatlvarinble pressure, overfire and dual boiler. A general modeling approach is described which can be used to model units with multiple operating modes. It is shown how Lagrangian relaxation can be used to schedule these units. Examples are given showing the benefit of using these methods to schedule a utility's system.Power Coordinating Center, Ann Arbor, Michigan, where he is responsible for the system power transactions as well as the daily planning and scheduling of the generation units of the combined systems of Detroit Power and Consumers Power Companies. He is a Registered Professional Engineer in Michigan.

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