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The conventional load dispatching among thermal units is determined on the basis of the well-known equal incremental fuel cost law but this method essentically fails to take into account shortterm future load demand. This paper presents a novel load dispatching method which takes into account the response capabilities of thermal units and short-term future load demand. This method has been successfully applied to a sample system. From a series of simulation results, it may be concluded that the optimum forecast period is approximately one hour in which the load demand should be forecast for a total of 4 to 6 points. Application of this method to an on-line load dispatching control in every utility is sufficiently possible at the present time and would be in the future.