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An intelligent load flow engine is an expert system embedded in the personal workstation that is used by the power system planners. The objective of the engine is to provide both an expert and novice user with a friendly working environment, aiming at enhancing a user's creativity in making operational plans. To this end, the personal scientific workstation that was developed for power system planning is equipped with an expert system whose knowledges are acquired from the experienced power system planners. This paper describes the detail of the intelligent engine, and shows how the load flow planning is assisted with an expert system.