Computer-based training is one of the most effective tools to reduce accidents in electric power industry. This paper presents the history of development of dispatch personnel simulator technology, from aviation simulators of the mid-20th century to traditional simulators, which finally formed in the late 1990s and the currently developing concept of intelligent simulators. The basic milestones and stages are considered. The authors present the actual problems of the simulator construction, which are the drivers of further development of this technology.