Long term operation planning of hydro-thermal power systems

A wide range of methods for long-term operation of both thermal and hydro systems have been in use for many years. Many of the methods are based on the same basic algorithm principles but quite different in implementation. Various approximations are used tailored to system characteristics. This report addresses the state-of-the-art methods for long-term operation planning in pure hydro - pure thermal and in hydro-thermal systems. The focus is on optimization methods.