The objectives of the generation planning studies conducted by CEB are, (a) To investigate the feasibility of new generating plants for addition to the system in terms of plant and system characteristics. (b) To specifically investigate the future operations of the hydro-thermal system in order to determine the most economical operating policy for reservoirs, hydro and thermal plants. (c) Toconductsystemsimulationstudiestodeterminetheeconomicallyoptimummixofgeneratingplants to meet the forecast demand and the acceptable reliability levels in the 20 year period ahead. (d) To investigate the robustness of the economically optimum plan by analyzing its sensitivity to changes in the key input parameters.