PGANDE'S STATE-OF-THE-ART SCHEDULING TOOL FOR HYDRO SYSTEMS.

A hydro-scheduling system, HYSS, was developed for the Pacific Gas and Electric Company to produce optimal release policies for each of the 86 hydropower plants in the 23 river-basin hydroelectric system. HYSS has become the basic tool used to operate the utility's complex hydro-generation system efficiently. The use of HYSS has helped increase production of hydropower, resulting in a reduction of revenues required from ratepayers of an estimated 10 million to 45 million each year. The improved schedules for hydropower result directly in better resource planning throughout the company.