3. NATURE OF PHYSICAL PROBLEM SOLVED
For a given closed region, the economically optimal strategy of power plant additions is evaluated by minimizing the total integrated electricity generating costs of the generating system. Therefore, as a subproblem, minimization of the system operating costs is done for each new configuration.
Special consideration is given to the following constraints - minimum or maximum capacity or generated energy for individual power plant categories, limitation of growth rate of capacity of certain power plant categories, availability of not naturally occurring nuclear fuels (e.g. plutonium), availability of base load capacity for generating pumping energy for pumped storage plants.